3366 lines
116 KiB
C++
3366 lines
116 KiB
C++
#include <cstdlib>
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#include <cassert>
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#include <cmath>
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#include <cstring>
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#include <string>
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#include <set>
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#include <chrono>
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#include <thread>
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#include <ratio>
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#include <iostream>
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#include <deque>
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#include <map>
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#include <thread>
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#include <functional>
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#include <signal.h>
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#include "fake6502.h"
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using namespace std;
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#include "emulator.h"
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#include "dis6502.h"
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#include "interface.h"
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#define LK_HACK 1
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const unsigned int DEBUG_ERROR = 0x01;
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const unsigned int DEBUG_WARN = 0x02;
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const unsigned int DEBUG_DECODE = 0x04;
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const unsigned int DEBUG_STATE = 0x08;
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const unsigned int DEBUG_RW = 0x10;
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const unsigned int DEBUG_BUS = 0x20;
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const unsigned int DEBUG_FLOPPY = 0x40;
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const unsigned int DEBUG_SWITCH = 0x80;
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volatile unsigned int debug = DEBUG_ERROR | DEBUG_WARN ; // | DEBUG_DECODE | DEBUG_STATE | DEBUG_RW;
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bool delete_is_left_arrow = true;
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volatile bool exit_on_banking = false;
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volatile bool exit_on_memory_fallthrough = true;
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volatile bool run_fast = false;
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volatile bool pause_cpu = false;
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// XXX - this should be handled through a function passed to MAINboard
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APPLE2Einterface::ModeHistory mode_history;
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const float paddle_max_pulse_seconds = .00282;
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// Map from memory address to name of function (from the ld65 map file).
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static map<int,string> address_to_function_name;
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typedef unsigned long long clk_t;
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struct system_clock
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{
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clk_t clock_cpu = 0; // Actual CPU and memory clocks, variable rate
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clk_t clock_14mhz = 0; // Fixed 14.31818MHz clock
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clk_t phase_hpe = 0; // Phase of CPU clock within horizontal lines
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operator clk_t() const { return clock_14mhz; }
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void add_cpu_cycles(clk_t elapsed_cpu)
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{
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clock_cpu += elapsed_cpu;
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clock_14mhz += elapsed_cpu * 14 + (elapsed_cpu + phase_hpe) / 65 * 2;
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phase_hpe = (phase_hpe + elapsed_cpu) % 65;
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if(0) printf("added %llu, new cpu clock %llu, 14mhz clock %llu, phase %llu\n", elapsed_cpu, clock_cpu, clock_14mhz, phase_hpe);
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}
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} clk;
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// was 1023000
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// 3.579545 * 4 / 14
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// 1.02272714285714285714
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const int machine_clock_rate = 14318180;
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bool read_blob(char *name, unsigned char *b, size_t sz)
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{
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FILE *fp = fopen(name, "rb");
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if(fp == NULL) {
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fprintf(stderr, "failed to open %s for reading\n", name);
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fclose(fp);
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return false;
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}
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size_t length = fread(b, 1, sz, fp);
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if(length < sz) {
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fprintf(stderr, "File read from %s was unexpectedly short (%zd bytes, expected %zd)\n", name, length, sz);
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perror("read_blob");
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fclose(fp);
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return false;
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}
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fclose(fp);
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return true;
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}
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/**
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* Parse a map entry from an ld65 map file and add it to the address_to_function_name map.
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*/
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static void add_map_entry(char *line)
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{
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// Find end of function name and terminate it.
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char *s = line;
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while (*s != ' ') {
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s++;
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}
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*s = '\0';
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string function_name = string(line);
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// Parse hex address.
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int address = strtol(line + 26, NULL, 16);
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// See if we have a duplicate. We define our own symbols (like _pushax) as aliases
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// to cc65-defined ones (like pushax) so we can access them from C.
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string old_function_name = address_to_function_name[address];
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if (old_function_name.size() != 0 && old_function_name.size() < function_name.size()) {
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// Skip this one, we already have one that's shorter (probably without
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// leading underscore).
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} else {
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// Add to map.
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address_to_function_name[address] = line;
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}
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}
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/**
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* Read a map file generated by ld65. Puts symbols into the address_to_function_name map.
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*/
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static bool read_map(char *name)
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{
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char line[100];
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FILE *fp = fopen(name, "r");
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int state = 0;
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while (state != 3 && fgets(line, sizeof(line), fp) != NULL) {
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switch (state) {
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case 0:
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if (strncmp(line, "Exports list by name:", 21) == 0) {
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// Found header.
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state = 1;
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}
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break;
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case 1:
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// Skip line with dashes.
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state = 2;
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break;
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case 2:
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// Parse table.
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if (strlen(line) <= 76) {
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// End of table.
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state = 3;
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}
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add_map_entry(line);
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add_map_entry(line + 40);
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break;
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}
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}
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fclose(fp);
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return true;
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}
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struct SoftSwitch
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{
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string name;
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int clear_address;
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int set_address;
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int read_address;
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bool read_also_changes;
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bool enabled = false;
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bool implemented;
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SoftSwitch(const char* name_, int clear, int on, int read, bool read_changes, vector<SoftSwitch*>& s, bool implemented_ = false) :
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name(name_),
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clear_address(clear),
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set_address(on),
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read_address(read),
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read_also_changes(read_changes),
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implemented(implemented_)
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{
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s.push_back(this);
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}
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operator bool() const
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{
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return enabled;
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}
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};
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struct region
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{
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string name;
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int base;
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int size;
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bool contains(int addr) const
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{
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return addr >= base && addr < base + size;
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}
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};
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typedef std::function<bool()> enabled_func;
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enum MemoryType {RAM, ROM};
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struct backed_region : region
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{
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vector<unsigned char> memory;
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MemoryType type;
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enabled_func read_enabled;
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enabled_func write_enabled;
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backed_region(const char* name, int base, int size, MemoryType type_, vector<backed_region*>* regions, enabled_func enabled_) :
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region{name, base, size},
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memory(size),
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type(type_),
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read_enabled(enabled_),
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write_enabled(enabled_)
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{
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std::fill(memory.begin(), memory.end(), 0x00);
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if(regions)
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regions->push_back(this);
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}
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backed_region(const char* name, int base, int size, MemoryType type_, vector<backed_region*>* regions, enabled_func read_enabled_, enabled_func write_enabled_) :
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region{name, base, size},
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memory(size),
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type(type_),
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read_enabled(read_enabled_),
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write_enabled(write_enabled_)
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{
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std::fill(memory.begin(), memory.end(), 0x00);
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if(regions)
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regions->push_back(this);
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}
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bool contains(int addr) const
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{
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return addr >= base && addr < base + size;
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}
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bool read(int addr, unsigned char& data)
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{
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if(contains(addr) && read_enabled()) {
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data = memory[addr - base];
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return true;
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}
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return false;
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}
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bool write(int addr, unsigned char data)
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{
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if((type == RAM) && contains(addr) && write_enabled()) {
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memory[addr - base] = data;
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return true;
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}
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return false;
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}
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};
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const region io_region = {"io", 0xC000, 0x100};
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unsigned char floppy_header[21] = {
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0xD5, 0xAA, 0x96, 0xFF, 0xFE, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0xDE, 0xAA, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xD5, 0xAA, 0xAD };
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unsigned char floppy_doSector[16] = {
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0x0, 0x7, 0xE, 0x6, 0xD, 0x5, 0xC, 0x4, 0xB, 0x3, 0xA, 0x2, 0x9, 0x1, 0x8, 0xF };
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unsigned char floppy_poSector[16] = {
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0x0, 0x8, 0x1, 0x9, 0x2, 0xA, 0x3, 0xB, 0x4, 0xC, 0x5, 0xD, 0x6, 0xE, 0x7, 0xF };
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void floppy_NybblizeImage(unsigned char *image, unsigned char *nybblized, unsigned char *skew)
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{
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// Format of a sector is header (23) + nybbles (343) + footer (30) = 396
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// (short by 20 bytes of 416 [413 if 48 byte header is one time only])
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// hdr (21) + nybbles (343) + footer (48) = 412 bytes per sector
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// (not incl. 64 byte track marker)
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static unsigned char footer[48] = {
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0xDE, 0xAA, 0xEB, 0xFF, 0xEB, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
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static unsigned char diskbyte[0x40] = {
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0x96, 0x97, 0x9A, 0x9B, 0x9D, 0x9E, 0x9F, 0xA6,
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0xA7, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB2, 0xB3,
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0xB4, 0xB5, 0xB6, 0xB7, 0xB9, 0xBA, 0xBB, 0xBC,
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0xBD, 0xBE, 0xBF, 0xCB, 0xCD, 0xCE, 0xCF, 0xD3,
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0xD6, 0xD7, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE,
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0xDF, 0xE5, 0xE6, 0xE7, 0xE9, 0xEA, 0xEB, 0xEC,
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0xED, 0xEE, 0xEF, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6,
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0xF7, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF };
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memset(nybblized, 0xFF, 232960); // Doesn't matter if 00s or FFs...
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unsigned char *p = nybblized;
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for(unsigned char trk=0; trk<35; trk++)
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{
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memset(p, 0xFF, 64); // Write gap 1, 64 bytes (self-sync)
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p += 64;
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for(unsigned char sector=0; sector<16; sector++)
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{
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memcpy(p, floppy_header, 21); // Set up the sector header
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p[5] = ((trk >> 1) & 0x55) | 0xAA;
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p[6] = (trk & 0x55) | 0xAA;
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p[7] = ((sector >> 1) & 0x55) | 0xAA;
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p[8] = (sector & 0x55) | 0xAA;
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p[9] = (((trk ^ sector ^ 0xFE) >> 1) & 0x55) | 0xAA;
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p[10] = ((trk ^ sector ^ 0xFE) & 0x55) | 0xAA;
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p += 21;
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unsigned char * bytes = image;
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bytes += (skew[sector] * 256) + (trk * 256 * 16);
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// Convert the 256 8-bit bytes into 342 6-bit bytes.
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for(int i=0; i<0x56; i++)
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{
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p[i] = ((bytes[(i + 0xAC) & 0xFF] & 0x01) << 7)
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| ((bytes[(i + 0xAC) & 0xFF] & 0x02) << 5)
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| ((bytes[(i + 0x56) & 0xFF] & 0x01) << 5)
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| ((bytes[(i + 0x56) & 0xFF] & 0x02) << 3)
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| ((bytes[(i + 0x00) & 0xFF] & 0x01) << 3)
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| ((bytes[(i + 0x00) & 0xFF] & 0x02) << 1);
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}
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p[0x54] &= 0x3F;
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p[0x55] &= 0x3F;
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memcpy(p + 0x56, bytes, 256);
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// XOR the data block with itself, offset by one byte,
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// creating a 343rd byte which is used as a cheksum.
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p[342] = 0x00;
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for(int i=342; i>0; i--)
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p[i] = p[i] ^ p[i - 1];
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// Using a lookup table, convert the 6-bit bytes into disk bytes.
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for(int i=0; i<343; i++)
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p[i] = diskbyte[p[i] >> 2];
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p += 343;
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// Done with the nybblization, now for the epilogue...
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memcpy(p, footer, 48);
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p += 48;
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}
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}
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}
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struct DISKIIboard : board_base
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{
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const unsigned int CA0 = 0xC0E0; // stepper phase 0 / control line 0
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const unsigned int CA1 = 0xC0E2; // stepper phase 1 / control line 1
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const unsigned int CA2 = 0xC0E4; // stepper phase 2 / control line 2
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const unsigned int CA3 = 0xC0E6; // stepper phase 3 / control strobe
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const unsigned int ENABLE = 0xC0E8; // disk drive off/on
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const unsigned int SELECT = 0xC0EA; // select drive 1/2
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const unsigned int Q6L = 0xC0EC; // IO strobe for read
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const unsigned int Q6H = 0xC0ED; // IO strobe for write
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const unsigned int Q7L = 0xC0EE; // IO strobe for clear
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const unsigned int Q7H = 0xC0EF; // IO strobe for shift
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map<unsigned int, string> io = {
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{0xC0E0, "CA0OFF"},
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{0xC0E1, "CA0ON"},
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{0xC0E2, "CA1OFF"},
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{0xC0E3, "CA1ON"},
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{0xC0E4, "CA2OFF"},
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{0xC0E5, "CA2ON"},
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{0xC0E6, "CA3OFF"},
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{0xC0E7, "CA3ON"},
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{0xC0E8, "DISABLE"},
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{0xC0E9, "ENABLE"},
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{0xC0EA, "SELECT0"},
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{0xC0EB, "SELECT1"},
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{0xC0EC, "Q6L"},
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{0xC0ED, "Q6H"},
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{0xC0EE, "Q7L"},
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{0xC0EF, "Q7H"},
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};
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backed_region rom_C600 = {"rom_C600", 0xC600, 0x0100, ROM, nullptr, [&]{return true;}};
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|
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unsigned char floppy_image[2][143360];
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unsigned char floppy_nybblized[2][232960];
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const unsigned int bytes_per_nybblized_track = 6656;
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bool floppy_present[2];
|
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|
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int drive_selected = 0;
|
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bool drive_motor_enabled[2];
|
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enum {READ, WRITE} head_mode = READ;
|
||
unsigned char data_latch = 0x00;
|
||
int head_stepper_phase[4] = {0, 0, 0, 0};
|
||
int head_stepper_most_recent_phase = 0;
|
||
int track_number = 0; // physical track number - DOS and ProDOS only use even tracks
|
||
unsigned int track_byte = 0;
|
||
|
||
void set_floppy(int number, char *name) // number 0 or 1; name = NULL to eject
|
||
{
|
||
floppy_present[number] = false;
|
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if(name) {
|
||
if(!read_blob(name, floppy_image[number], sizeof(floppy_image[0])))
|
||
throw "Couldn't read floppy";
|
||
|
||
floppy_present[number] = true;
|
||
unsigned char *skew;
|
||
if(strcmp(name + strlen(name) - 3, ".po") == 0) {
|
||
printf("ProDOS floppy\n");
|
||
skew = floppy_poSector;
|
||
}
|
||
else
|
||
skew = floppy_doSector;
|
||
floppy_NybblizeImage(floppy_image[number], floppy_nybblized[number], skew);
|
||
}
|
||
}
|
||
|
||
typedef std::function<void (int number, bool activity)> floppy_activity_func;
|
||
floppy_activity_func floppy_activity;
|
||
|
||
DISKIIboard(unsigned char diskII_rom[256], char *floppy0_name, char *floppy1_name, floppy_activity_func floppy_activity_) :
|
||
floppy_activity(floppy_activity_)
|
||
{
|
||
std::copy(diskII_rom, diskII_rom + 0x100, rom_C600.memory.begin());
|
||
set_floppy(0, floppy0_name);
|
||
set_floppy(1, floppy1_name);
|
||
}
|
||
|
||
unsigned char read_next_nybblized_byte()
|
||
{
|
||
if(head_mode != READ || !drive_motor_enabled[drive_selected] || !floppy_present[drive_selected])
|
||
return 0x00;
|
||
int i = track_byte;
|
||
track_byte = (track_byte + 1) % bytes_per_nybblized_track;
|
||
return floppy_nybblized[drive_selected][(track_number / 2) * bytes_per_nybblized_track + i];
|
||
}
|
||
|
||
void control_track_motor(unsigned int addr)
|
||
{
|
||
int phase = (addr & 0x7) >> 1;
|
||
int state = addr & 0x1;
|
||
head_stepper_phase[phase] = state;
|
||
if(debug & DEBUG_FLOPPY) printf("stepper %04X, phase %d, state %d, so stepper motor state now: %d, %d, %d, %d\n",
|
||
addr, phase, state,
|
||
head_stepper_phase[0], head_stepper_phase[1],
|
||
head_stepper_phase[2], head_stepper_phase[3]);
|
||
if(state == 1) { // turn stepper motor phase on
|
||
if(head_stepper_most_recent_phase == (((phase - 1) + 4) % 4)) { // stepping up
|
||
track_number = min(track_number + 1, 70);
|
||
if(debug & DEBUG_FLOPPY) printf("track number now %d\n", track_number);
|
||
} else if(head_stepper_most_recent_phase == ((phase + 1) % 4)) { // stepping down
|
||
track_number = max(0, track_number - 1);
|
||
if(debug & DEBUG_FLOPPY) printf("track number now %d\n", track_number);
|
||
} else if(head_stepper_most_recent_phase == phase) { // unexpected condition
|
||
if(debug & DEBUG_FLOPPY) printf("track head stepper no change\n");
|
||
} else { // unexpected condition
|
||
if(debug & DEBUG_WARN) fprintf(stderr, "unexpected track stepper motor state: %d, %d, %d, %d\n",
|
||
head_stepper_phase[0], head_stepper_phase[1],
|
||
head_stepper_phase[2], head_stepper_phase[3]);
|
||
if(debug & DEBUG_WARN) fprintf(stderr, "most recent phase: %d\n", head_stepper_most_recent_phase);
|
||
}
|
||
head_stepper_most_recent_phase = phase;
|
||
}
|
||
}
|
||
|
||
virtual bool write(int addr, unsigned char data)
|
||
{
|
||
if(addr < 0xC0E0 || addr > 0xC0EF)
|
||
return false;
|
||
if(debug & DEBUG_WARN) printf("DISK II unhandled write of %02X to %04X (%s)\n", data, addr, io[addr].c_str());
|
||
return false;
|
||
}
|
||
virtual bool read(int addr, unsigned char &data)
|
||
{
|
||
if(rom_C600.read(addr, data)) {
|
||
if(debug & DEBUG_RW) printf("DiskII read 0x%04X -> %02X\n", addr, data);
|
||
return true;
|
||
}
|
||
|
||
if(addr < 0xC0E0 || addr > 0xC0EF) {
|
||
return false;
|
||
}
|
||
|
||
if(addr >= CA0 && addr <= (CA3 + 1)) {
|
||
if(debug & DEBUG_FLOPPY) printf("floppy control track motor\n");
|
||
control_track_motor(addr);
|
||
data = 0;
|
||
return true;
|
||
} else if(addr == Q6L) { // 0xC0EC
|
||
data = read_next_nybblized_byte();
|
||
if(debug & DEBUG_FLOPPY) printf("floppy read byte : %02X\n", data);
|
||
return true;
|
||
} else if(addr == Q6H) { // 0xC0ED
|
||
if(debug & DEBUG_FLOPPY) printf("floppy read latch\n");
|
||
data = data_latch; // XXX do something with the latch - e.g. set write-protect bit
|
||
data = 0;
|
||
return true;
|
||
} else if(addr == Q7L) { // 0xC0EE
|
||
if(debug & DEBUG_FLOPPY) printf("floppy set read\n");
|
||
head_mode = READ;
|
||
data = 0;
|
||
return true;
|
||
} else if(addr == Q7H) { // 0xC0EF
|
||
if(debug & DEBUG_FLOPPY) printf("floppy set write\n");
|
||
head_mode = WRITE;
|
||
data = 0;
|
||
return true;
|
||
} else if(addr == SELECT) {
|
||
if(debug & DEBUG_FLOPPY) printf("floppy select first drive\n");
|
||
drive_selected = 0;
|
||
return true;
|
||
} else if(addr == SELECT + 1) {
|
||
if(debug & DEBUG_FLOPPY) printf("floppy select second drive\n");
|
||
drive_selected = 1;
|
||
return true;
|
||
} else if(addr == ENABLE) {
|
||
if(debug & DEBUG_FLOPPY) printf("floppy switch off\n");
|
||
drive_motor_enabled[drive_selected] = false;
|
||
floppy_activity(drive_selected, false);
|
||
// go disable reading
|
||
// disable other drive?
|
||
return true;
|
||
} else if(addr == ENABLE + 1) {
|
||
if(debug & DEBUG_FLOPPY) printf("floppy switch on\n");
|
||
drive_motor_enabled[drive_selected] = true;
|
||
floppy_activity(drive_selected, true);
|
||
// go enable reading
|
||
// disable other drive?
|
||
return true;
|
||
}
|
||
if(debug & DEBUG_WARN) printf("DISK II unhandled read from %04X (%s)\n", addr, io[addr].c_str());
|
||
data = 0;
|
||
return true;
|
||
}
|
||
virtual void reset(void) {}
|
||
};
|
||
|
||
struct Mockingboard : board_base
|
||
{
|
||
Mockingboard()
|
||
{
|
||
}
|
||
|
||
virtual bool write(int addr, unsigned char data)
|
||
{
|
||
if((addr >= 0xC400) && (addr <= 0xC4FF)) {
|
||
if(debug & DEBUG_RW) printf("Mockingboard write 0x%02X to 0x%04X ignored\n", data, addr);
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
virtual bool read(int addr, unsigned char &data)
|
||
{
|
||
if((addr >= 0xC400) && (addr <= 0xC4FF)) {
|
||
if(debug & DEBUG_RW) printf("Mockingboard read at 0x%04X ignored\n", addr);
|
||
data = 0;
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
virtual void reset(void) {}
|
||
};
|
||
|
||
const int waveform_length = 44100 / 1000 / 2; // half of a wave at 4000 Hz
|
||
const float waveform_max_amplitude = .35f;
|
||
static unsigned char waveform[waveform_length];
|
||
|
||
static void initialize_audio_waveform() __attribute__((constructor));
|
||
void initialize_audio_waveform()
|
||
{
|
||
for(int i = 0; i < waveform_length; i++) {
|
||
float theta = (float(i) / (waveform_length - 1) -.5f) * M_PI;
|
||
|
||
waveform[i] = 127.5 + waveform_max_amplitude * 127.5 * sin(theta);
|
||
}
|
||
}
|
||
|
||
int hires_blanking_address_base[262];
|
||
extern int hires_visible_address_base[262];
|
||
|
||
static void generate_hires_scanout_addresses() __attribute__((constructor));
|
||
void generate_hires_scanout_addresses()
|
||
{
|
||
for(int i = 0; i < 262; i++)
|
||
if(i < 64)
|
||
hires_blanking_address_base[i] = hires_visible_address_base[i] + 0x68;
|
||
else
|
||
hires_blanking_address_base[i] = hires_visible_address_base[i] - 0x18;
|
||
}
|
||
|
||
int get_hires_scanout_address(int byte_in_frame)
|
||
{
|
||
int line_in_frame = byte_in_frame / 65;
|
||
int byte_in_line = byte_in_frame % 65;
|
||
if(byte_in_line < 25)
|
||
return 0x2000 + (hires_blanking_address_base[line_in_frame] + byte_in_line) % 0x2000;
|
||
|
||
return 0x2000 + (hires_visible_address_base[line_in_frame] + byte_in_line - 25) % 0x2000;
|
||
}
|
||
|
||
static int text_blanking_address_base[] =
|
||
{
|
||
0x1468,
|
||
0x14E8,
|
||
0x1568,
|
||
0x15E8,
|
||
0x1668,
|
||
0x16E8,
|
||
0x1768,
|
||
0x17E8,
|
||
0x1410,
|
||
0x1490,
|
||
0x1510,
|
||
0x1590,
|
||
0x1610,
|
||
0x1690,
|
||
0x1710,
|
||
0x1790,
|
||
0x1438,
|
||
0x14B8,
|
||
0x1538,
|
||
0x15B8,
|
||
0x1638,
|
||
0x16B8,
|
||
0x1738,
|
||
0x17B8,
|
||
0x1460,
|
||
0x14E0,
|
||
0x1560,
|
||
0x15E0,
|
||
0x1660,
|
||
0x16E0,
|
||
0x1760,
|
||
0x17E0,
|
||
0x17E0, // last text line is actually scanned 14 times so add another row
|
||
};
|
||
|
||
static int text_visible_address_base[] =
|
||
{
|
||
0x0400,
|
||
0x0480,
|
||
0x0500,
|
||
0x0580,
|
||
0x0600,
|
||
0x0680,
|
||
0x0700,
|
||
0x0780,
|
||
0x0428,
|
||
0x04A8,
|
||
0x0528,
|
||
0x05A8,
|
||
0x0628,
|
||
0x06A8,
|
||
0x0728,
|
||
0x07A8,
|
||
0x0450,
|
||
0x04D0,
|
||
0x0550,
|
||
0x05D0,
|
||
0x0650,
|
||
0x06D0,
|
||
0x0750,
|
||
0x07D0,
|
||
0x0478,
|
||
0x04F8,
|
||
0x0578,
|
||
0x05F8,
|
||
0x0678,
|
||
0x06F8,
|
||
0x0778,
|
||
0x07F8,
|
||
0x07F8, // last text line is actually scanned 14 times so add another row
|
||
};
|
||
|
||
int get_text_scanout_address(int byte_in_frame)
|
||
{
|
||
int text_line_in_frame = byte_in_frame / (8 * 65);
|
||
int byte_in_line = byte_in_frame % 65;
|
||
|
||
if(byte_in_line < 25)
|
||
return text_blanking_address_base[text_line_in_frame] + byte_in_line;
|
||
|
||
return text_visible_address_base[text_line_in_frame] + byte_in_line - 25;
|
||
}
|
||
|
||
struct MAINboard : board_base
|
||
{
|
||
system_clock& clk;
|
||
|
||
vector<board_base*> boards;
|
||
|
||
vector<SoftSwitch*> switches;
|
||
SoftSwitch* switches_by_address[256];
|
||
// SoftSwitch(const char* name_, int clear, int on, int read, bool read_changes, vector<SoftSwitch*>& s, bool implemented_ = false) :
|
||
SoftSwitch CXROM {"CXROM", 0xC006, 0xC007, 0xC015, false, switches, true};
|
||
SoftSwitch STORE80 {"STORE80", 0xC000, 0xC001, 0xC018, false, switches, true};
|
||
SoftSwitch RAMRD {"RAMRD", 0xC002, 0xC003, 0xC013, false, switches, true};
|
||
SoftSwitch RAMWRT {"RAMWRT", 0xC004, 0xC005, 0xC014, false, switches, true};
|
||
SoftSwitch ALTZP {"ALTZP", 0xC008, 0xC009, 0xC016, false, switches, true};
|
||
SoftSwitch C3ROM {"C3ROM", 0xC00A, 0xC00B, 0xC017, false, switches, true};
|
||
SoftSwitch ALTCHAR {"ALTCHAR", 0xC00E, 0xC00F, 0xC01E, false, switches, true};
|
||
SoftSwitch VID80 {"VID80", 0xC00C, 0xC00D, 0xC01F, false, switches, true};
|
||
SoftSwitch TEXT {"TEXT", 0xC050, 0xC051, 0xC01A, true, switches, true};
|
||
SoftSwitch MIXED {"MIXED", 0xC052, 0xC053, 0xC01B, true, switches, true};
|
||
SoftSwitch PAGE2 {"PAGE2", 0xC054, 0xC055, 0xC01C, true, switches, true};
|
||
SoftSwitch HIRES {"HIRES", 0xC056, 0xC057, 0xC01D, true, switches, true};
|
||
|
||
vector<backed_region*> regions;
|
||
vector<backed_region*> regions_by_page[256];
|
||
|
||
backed_region szp = {"szp", 0x0000, 0x0200, RAM, ®ions, [&](){return !ALTZP;}}; // stack and zero page
|
||
backed_region aszp = {"aszp", 0x0000, 0x0200, RAM, ®ions, [&](){return ALTZP;}}; // alternate stack and zero page
|
||
|
||
bool internal_C800_ROM_selected;
|
||
backed_region rom_C100 = {"rom_C100", 0xC100, 0x0200, ROM, ®ions, [&]{return CXROM;}};
|
||
backed_region rom_C300 = {"rom_C300", 0xC300, 0x0100, ROM, ®ions, [&]{return CXROM || (!CXROM && !C3ROM);}};
|
||
backed_region rom_C400 = {"rom_C400", 0xC300, 0x0400, ROM, ®ions, [&]{return CXROM;}};
|
||
backed_region rom_C800 = {"rom_C800", 0xC800, 0x0800, ROM, ®ions, [&]{return CXROM || (!CXROM && !C3ROM && internal_C800_ROM_selected);}};
|
||
backed_region rom_CXXX_default = {"rom_CXXX_default", 0xC100, 0x0F00, ROM, ®ions, [&]{return true;}};
|
||
|
||
enabled_func read_from_aux_ram = [&]{return RAMRD;};
|
||
enabled_func write_to_aux_ram = [&]{return RAMWRT;};
|
||
enabled_func read_from_main_ram = [&]{return !read_from_aux_ram();};
|
||
enabled_func write_to_main_ram = [&]{return !write_to_aux_ram();};
|
||
|
||
backed_region ram_0200 = {"ram_0200", 0x0200, 0x0200, RAM, ®ions, read_from_main_ram, write_to_main_ram};
|
||
backed_region ram_0200_x = {"ram_0200_x", 0x0200, 0x0200, RAM, ®ions, read_from_aux_ram, write_to_aux_ram};
|
||
backed_region ram_0C00 = {"ram_0C00", 0x0C00, 0x1400, RAM, ®ions, read_from_main_ram, write_to_main_ram};
|
||
backed_region ram_0C00_x = {"ram_0C00_x", 0x0C00, 0x1400, RAM, ®ions, read_from_aux_ram, write_to_aux_ram};
|
||
backed_region ram_6000 = {"ram_6000", 0x6000, 0x6000, RAM, ®ions, read_from_main_ram, write_to_main_ram};
|
||
backed_region ram_6000_x = {"ram_6000_x", 0x6000, 0x6000, RAM, ®ions, read_from_aux_ram, write_to_aux_ram};
|
||
|
||
enabled_func read_from_aux_text1 = [&]{return (RAMRD && !STORE80) || (STORE80 && PAGE2);};
|
||
enabled_func write_to_aux_text1 = [&]{return (RAMWRT && !STORE80) || (STORE80 && PAGE2);};
|
||
enabled_func read_from_main_text1 = [&]{return !read_from_aux_text1();};
|
||
enabled_func write_to_main_text1 = [&]{return !write_to_aux_text1();};
|
||
|
||
backed_region text_page1 = {"text_page1", 0x0400, 0x0400, RAM, ®ions, read_from_main_text1, write_to_main_text1};
|
||
backed_region text_page1x = {"text_page1x", 0x0400, 0x0400, RAM, ®ions, read_from_aux_text1, write_to_aux_text1};
|
||
backed_region text_page2 = {"text_page2", 0x0800, 0x0400, RAM, ®ions, read_from_main_ram, write_to_main_ram};
|
||
backed_region text_page2x = {"text_page2x", 0x0800, 0x0400, RAM, ®ions, read_from_aux_ram, write_to_aux_ram};
|
||
|
||
enabled_func read_from_aux_hires1 = [&]{return HIRES && RAMRD && ((!STORE80) || (STORE80 && PAGE2));};
|
||
enabled_func write_to_aux_hires1 = [&]{return HIRES && RAMWRT && ((!STORE80) || (STORE80 && PAGE2));};
|
||
enabled_func read_from_main_hires1 = [&]{return !read_from_aux_hires1();};
|
||
enabled_func write_to_main_hires1 = [&]{return !write_to_aux_hires1();};
|
||
|
||
backed_region hires_page1 = {"hires_page1", 0x2000, 0x2000, RAM, ®ions, read_from_main_hires1, write_to_main_hires1};
|
||
backed_region hires_page1x = {"hires_page1x", 0x2000, 0x2000, RAM, ®ions, read_from_aux_hires1, write_to_aux_hires1};
|
||
backed_region hires_page2 = {"hires_page2", 0x4000, 0x2000, RAM, ®ions, read_from_main_ram, write_to_main_ram};
|
||
backed_region hires_page2x = {"hires_page2x", 0x4000, 0x2000, RAM, ®ions, read_from_aux_ram, write_to_aux_ram};
|
||
|
||
enum {BANK1, BANK2} C08X_bank;
|
||
bool C08X_read_RAM;
|
||
bool C08X_write_RAM;
|
||
|
||
backed_region rom_D000 = {"rom_D000", 0xD000, 0x1000, ROM, ®ions, [&]{return !C08X_read_RAM;}};
|
||
backed_region rom_E000 = {"rom_E000", 0xE000, 0x2000, ROM, ®ions, [&]{return !C08X_read_RAM;}};
|
||
|
||
backed_region ram1_main_D000 = {"ram1_main_D000", 0xD000, 0x1000, RAM, ®ions, [&]{return !ALTZP && C08X_read_RAM && (C08X_bank == BANK1);}, [&]{return !ALTZP && C08X_write_RAM && (C08X_bank == BANK1);}};
|
||
backed_region ram2_main_D000 = {"ram2_main_D000", 0xD000, 0x1000, RAM, ®ions, [&]{return !ALTZP && C08X_read_RAM && (C08X_bank == BANK2);}, [&]{return !ALTZP && C08X_write_RAM && (C08X_bank == BANK2);}};
|
||
backed_region ram_main_E000 = {"ram1_main_E000", 0xE000, 0x2000, RAM, ®ions, [&]{return C08X_read_RAM;}, [&]{return !ALTZP && C08X_write_RAM;}};
|
||
backed_region ram1_main_D000_x = {"ram1_main_D000_x", 0xD000, 0x1000, RAM, ®ions, [&]{return ALTZP && C08X_read_RAM && (C08X_bank == BANK1);}, [&]{return ALTZP && C08X_write_RAM && (C08X_bank == BANK1);}};
|
||
backed_region ram2_main_D000_x = {"ram2_main_D000_x", 0xD000, 0x1000, RAM, ®ions, [&]{return ALTZP && C08X_read_RAM && (C08X_bank == BANK2);}, [&]{return ALTZP && C08X_write_RAM && (C08X_bank == BANK2);}};
|
||
backed_region ram_main_E000_x = {"ram1_main_E000_x", 0xE000, 0x2000, RAM, ®ions, [&]{return ALTZP && C08X_read_RAM;}, [&]{return ALTZP && C08X_write_RAM;}};
|
||
|
||
set<int> ignore_mmio = {0xC058, 0xC05A, 0xC05D, 0xC05F, 0xC061, 0xC062};
|
||
set<int> banking_read_switches = {
|
||
0xC080, 0xC081, 0xC082, 0xC083, 0xC084, 0xC085, 0xC086, 0xC087,
|
||
0xC088, 0xC089, 0xC08A, 0xC08B, 0xC08C, 0xC08D, 0xC08E, 0xC08F,
|
||
};
|
||
set<int> banking_write_switches = {
|
||
0xC006, 0xC007,
|
||
0xC000, 0xC001,
|
||
0xC002, 0xC003,
|
||
0xC004, 0xC005,
|
||
0xC008, 0xC009,
|
||
0xC00A, 0xC00B,
|
||
};
|
||
|
||
deque<unsigned char> keyboard_buffer;
|
||
|
||
static const int sample_rate = 44100;
|
||
static const size_t audio_buffer_size = sample_rate / 100;
|
||
char audio_buffer[audio_buffer_size];
|
||
long long audio_buffer_start_sample = 0;
|
||
long long audio_buffer_next_sample = 0;
|
||
unsigned char speaker_level;
|
||
bool speaker_transitioning_to_high = false;
|
||
int where_in_waveform = 0;
|
||
|
||
#if LK_HACK
|
||
unsigned char *disassemble_buffer = 0;
|
||
int disassemble_state = 0;
|
||
int disassemble_index = 0;
|
||
int disassemble_size = 0;
|
||
int disassemble_addr = 0;
|
||
#endif
|
||
|
||
void fill_flush_audio()
|
||
{
|
||
long long current_sample = clk * sample_rate / machine_clock_rate;
|
||
|
||
for(long long i = audio_buffer_next_sample; i < current_sample; i++) {
|
||
if(where_in_waveform < waveform_length) {
|
||
unsigned char level = waveform[where_in_waveform++];
|
||
speaker_level = speaker_transitioning_to_high ? level : (255 - level);
|
||
}
|
||
|
||
audio_buffer[i % audio_buffer_size] = speaker_level;
|
||
|
||
if(i - audio_buffer_start_sample == audio_buffer_size - 1) {
|
||
audio_flush(audio_buffer, audio_buffer_size);
|
||
|
||
audio_buffer_start_sample = i + 1;
|
||
}
|
||
}
|
||
audio_buffer_next_sample = current_sample;
|
||
}
|
||
|
||
clk_t open_apple_down_ends = 0;
|
||
void momentary_open_apple(clk_t how_long)
|
||
{
|
||
open_apple_down_ends = clk + how_long;
|
||
}
|
||
|
||
// flush anything needing flushing
|
||
void sync()
|
||
{
|
||
fill_flush_audio();
|
||
}
|
||
|
||
void enqueue_key(unsigned char k)
|
||
{
|
||
keyboard_buffer.push_back(k);
|
||
}
|
||
|
||
APPLE2Einterface::ModeSettings convert_switches_to_mode_settings()
|
||
{
|
||
APPLE2Einterface::DisplayMode mode = TEXT ? APPLE2Einterface::TEXT : (HIRES ? APPLE2Einterface::HIRES : APPLE2Einterface::LORES);
|
||
int page = (PAGE2 && !STORE80) ? 1 : 0;
|
||
if(0)printf("mode %s, mixed %s, page %d, vid80 %s, altchar %s\n",
|
||
(mode == APPLE2Einterface::TEXT) ? "TEXT" : ((mode == APPLE2Einterface::LORES) ? "LORES" : "HIRES"),
|
||
MIXED ? "true" : "false",
|
||
page,
|
||
VID80 ? "true" : "false",
|
||
ALTCHAR ? "true" : "false");
|
||
return APPLE2Einterface::ModeSettings(mode, MIXED, page, VID80, ALTCHAR);
|
||
}
|
||
|
||
APPLE2Einterface::ModeSettings old_mode_settings;
|
||
void post_soft_switch_mode_change()
|
||
{
|
||
APPLE2Einterface::ModeSettings settings = convert_switches_to_mode_settings();
|
||
if(settings != old_mode_settings) {
|
||
mode_history.push_back(make_tuple(clk.clock_cpu, settings));
|
||
old_mode_settings = settings;
|
||
}
|
||
}
|
||
|
||
typedef std::function<bool (int addr, bool aux, unsigned char data)> display_write_func;
|
||
display_write_func display_write;
|
||
typedef std::function<void (char *audiobuffer, size_t dist)> audio_flush_func;
|
||
audio_flush_func audio_flush;
|
||
typedef std::function<tuple<float, bool> (int num)> get_paddle_func;
|
||
get_paddle_func get_paddle;
|
||
clk_t paddles_clock_out[4];
|
||
MAINboard(system_clock& clk_, unsigned char rom_image[32768], display_write_func display_write_, audio_flush_func audio_flush_, get_paddle_func get_paddle_) :
|
||
clk(clk_),
|
||
internal_C800_ROM_selected(true),
|
||
speaker_level(waveform[0]),
|
||
display_write(display_write_),
|
||
audio_flush(audio_flush_),
|
||
get_paddle(get_paddle_)
|
||
{
|
||
std::copy(rom_image + rom_D000.base - 0x8000, rom_image + rom_D000.base - 0x8000 + rom_D000.size, rom_D000.memory.begin());
|
||
std::copy(rom_image + rom_E000.base - 0x8000, rom_image + rom_E000.base - 0x8000 + rom_E000.size, rom_E000.memory.begin());
|
||
std::copy(rom_image + rom_C100.base - 0x8000, rom_image + rom_C100.base - 0x8000 + rom_C100.size, rom_C100.memory.begin());
|
||
std::copy(rom_image + rom_C300.base - 0x8000, rom_image + rom_C300.base - 0x8000 + rom_C300.size, rom_C300.memory.begin());
|
||
std::copy(rom_image + rom_C400.base - 0x8000, rom_image + rom_C400.base - 0x8000 + rom_C400.size, rom_C400.memory.begin());
|
||
std::copy(rom_image + rom_C800.base - 0x8000, rom_image + rom_C800.base - 0x8000 + rom_C800.size, rom_C800.memory.begin());
|
||
|
||
for(auto r : regions) {
|
||
int firstpage = r->base / 256;
|
||
int lastpage = (r->base + r->size + 255) / 256 - 1;
|
||
for(int i = firstpage; i <= lastpage; i++) {
|
||
regions_by_page[i].push_back(r);
|
||
}
|
||
}
|
||
for(int i = 0; i < 256; i++)
|
||
switches_by_address[i] = NULL;
|
||
for(auto sw : switches) {
|
||
switches_by_address[sw->clear_address - 0xC000] = sw;
|
||
switches_by_address[sw->set_address - 0xC000] = sw;
|
||
switches_by_address[sw->read_address - 0xC000] = sw;
|
||
}
|
||
// TEXT.enabled = true;
|
||
old_mode_settings = convert_switches_to_mode_settings();
|
||
}
|
||
|
||
virtual ~MAINboard()
|
||
{
|
||
}
|
||
|
||
virtual void reset()
|
||
{
|
||
// Partially from Apple //e Technical Reference
|
||
// XXX need to double-check these against the actual hardware
|
||
ALTZP.enabled = false;
|
||
CXROM.enabled = false;
|
||
RAMRD.enabled = false;
|
||
RAMWRT.enabled = false;
|
||
C3ROM.enabled = false;
|
||
VID80.enabled = false;
|
||
C08X_bank = BANK2;
|
||
C08X_read_RAM = false;
|
||
C08X_write_RAM = true;
|
||
internal_C800_ROM_selected = true;
|
||
}
|
||
|
||
virtual bool read(int addr, unsigned char &data)
|
||
{
|
||
if(debug & DEBUG_RW) printf("MAIN board read\n");
|
||
for(auto b : boards) {
|
||
if(b->read(addr, data)) {
|
||
return true;
|
||
}
|
||
}
|
||
if(io_region.contains(addr)) {
|
||
if(exit_on_banking && (banking_read_switches.find(addr) != banking_read_switches.end())) {
|
||
printf("bank switch control %04X, aborting\n", addr);
|
||
exit(1);
|
||
}
|
||
SoftSwitch* sw = switches_by_address[addr - 0xC000];
|
||
if(sw != NULL) {
|
||
|
||
unsigned char result = 0xFF;
|
||
|
||
// Special case for floating bus for reading video scanout
|
||
// XXX doesn't handle 80-column nor AUX
|
||
if((addr == 0xC050) || (addr == 0xC051)) {
|
||
bool page1 = (PAGE2 && !STORE80) ? false : true;
|
||
|
||
// 65 bytes per line, 262 lines per frame (aka "field")
|
||
int byte_in_frame = clk.clock_cpu % 17030;
|
||
int line_in_frame = byte_in_frame / 65;
|
||
|
||
if(0)printf("TEXT %s, HIRES %s, MIXED %s, line_in_frame = %d\n",
|
||
TEXT ? "true" : "false",
|
||
HIRES ? "true" : "false",
|
||
MIXED ? "true" : "false",
|
||
line_in_frame);
|
||
|
||
bool mixed_text_scanout =
|
||
((line_in_frame >= 160) && (line_in_frame < 192)) ||
|
||
(line_in_frame >= 224);
|
||
if(TEXT || !HIRES || (MIXED && mixed_text_scanout)) {
|
||
// TEXT or GR mode; they read the same addresses.
|
||
int addr2 = get_text_scanout_address(byte_in_frame) + (page1 ? 0 : 0x0400);
|
||
if(0)printf("got text scanout address $%04X\n", addr2);
|
||
if(addr2 > 0xC00) {
|
||
if(0)printf("read 0C00 floating bus\n");
|
||
ram_0C00.read(addr2, result);
|
||
} else {
|
||
if(page1) {
|
||
if(0)printf("read text page1 floating bus\n");
|
||
text_page1.read(addr2, result);
|
||
} else {
|
||
if(0)printf("read text page2 floating bus\n");
|
||
text_page2.read(addr2, result);
|
||
}
|
||
}
|
||
} else {
|
||
// HGR mode and not in text region if MIXED
|
||
int addr2 = get_hires_scanout_address(byte_in_frame) + (page1 ? 0 : 0x2000);
|
||
if(0)printf("got hires scanout address $%04X\n", addr2);
|
||
if(page1) {
|
||
if(0)printf("read hires page1 floating bus\n");
|
||
hires_page1.read(addr2, result);
|
||
} else {
|
||
if(0)printf("read hires page2 floating bus\n");
|
||
hires_page2.read(addr2, result);
|
||
}
|
||
}
|
||
}
|
||
|
||
if(addr == sw->read_address) {
|
||
data = sw->enabled ? 0x80 : 0x00;
|
||
if(debug & DEBUG_SWITCH) printf("Read status of %s = %02X\n", sw->name.c_str(), data);
|
||
return true;
|
||
} else if(sw->read_also_changes && addr == sw->set_address) {
|
||
if(!sw->implemented) { printf("%s ; set is unimplemented\n", sw->name.c_str()); fflush(stdout); exit(0); }
|
||
data = result;
|
||
sw->enabled = true;
|
||
if(debug & DEBUG_SWITCH) printf("Set %s\n", sw->name.c_str());
|
||
post_soft_switch_mode_change();
|
||
return true;
|
||
} else if(sw->read_also_changes && addr == sw->clear_address) {
|
||
if(!sw->implemented) { printf("%s ; unimplemented\n", sw->name.c_str()); fflush(stdout); exit(0); }
|
||
data = result;
|
||
sw->enabled = false;
|
||
if(debug & DEBUG_SWITCH) printf("Clear %s\n", sw->name.c_str());
|
||
post_soft_switch_mode_change();
|
||
return true;
|
||
}
|
||
}
|
||
if((addr & 0xFFF0) == 0xC080) {
|
||
C08X_bank = ((addr >> 3) & 1) ? BANK1 : BANK2;
|
||
C08X_write_RAM = addr & 1;
|
||
int read_ROM = ((addr >> 1) & 1) ^ C08X_write_RAM;
|
||
C08X_read_RAM = !read_ROM;
|
||
if(debug & DEBUG_SWITCH) printf("write %04X switch, %s, %d write_RAM, %d read_RAM\n", addr, (C08X_bank == BANK1) ? "BANK1" : "BANK2", C08X_write_RAM, C08X_read_RAM);
|
||
data = 0x00;
|
||
return true;
|
||
} else if(addr == 0xC011) {
|
||
data = (C08X_bank == BANK2) ? 0x80 : 0x0;
|
||
data = 0x00;
|
||
if(debug & DEBUG_SWITCH) printf("read BSRBANK2, return 0x%02X\n", data);
|
||
return true;
|
||
} else if(addr == 0xC012) {
|
||
data = C08X_read_RAM ? 0x80 : 0x0;
|
||
if(debug & DEBUG_SWITCH) printf("read BSRREADRAM, return 0x%02X\n", data);
|
||
return true;
|
||
} else if(addr == 0xC000) {
|
||
if(!keyboard_buffer.empty()) {
|
||
data = 0x80 | keyboard_buffer[0];
|
||
} else {
|
||
data = 0x00;
|
||
}
|
||
if(debug & DEBUG_RW) printf("read KBD, return 0x%02X\n", data);
|
||
return true;
|
||
} else if(addr == 0xC020) {
|
||
if(debug & DEBUG_RW) printf("read TAPE, force 0x00\n");
|
||
data = 0x00;
|
||
return true;
|
||
} else if(addr == 0xC030) {
|
||
if(debug & DEBUG_RW) printf("read SPKR, force 0x00\n");
|
||
|
||
fill_flush_audio();
|
||
data = 0x00;
|
||
where_in_waveform = 0;
|
||
speaker_transitioning_to_high = !speaker_transitioning_to_high;
|
||
return true;
|
||
} else if(addr == 0xC010) {
|
||
// reset keyboard latch
|
||
if(!keyboard_buffer.empty()) {
|
||
keyboard_buffer.pop_front();
|
||
}
|
||
data = 0x0;
|
||
if(debug & DEBUG_RW) printf("read KBDSTRB, return 0x%02X\n", data);
|
||
return true;
|
||
} else if(addr == 0xC070) {
|
||
for(int i = 0; i < 4; i++) {
|
||
float value;
|
||
bool button;
|
||
tie(value, button) = get_paddle(i);
|
||
paddles_clock_out[i] = clk + value * paddle_max_pulse_seconds * machine_clock_rate;
|
||
}
|
||
data = 0x0;
|
||
return true;
|
||
} else if(addr >= 0xC064 && addr <= 0xC067) {
|
||
int num = addr - 0xC064;
|
||
data = (clk < paddles_clock_out[num]) ? 0xff : 0x00;
|
||
return true;
|
||
} else if(addr >= 0xC061 && addr <= 0xC063) {
|
||
int num = addr - 0xC061;
|
||
if(num == 0 && (open_apple_down_ends > clk)) {
|
||
data = 0xff;
|
||
return true;
|
||
}
|
||
float value;
|
||
bool button;
|
||
tie(value, button) = get_paddle(num);
|
||
data = button ? 0xff : 0x0;
|
||
return true;
|
||
}
|
||
if(ignore_mmio.find(addr) != ignore_mmio.end()) {
|
||
if(debug & DEBUG_RW) printf("read %04X, ignored, return 0x00\n", addr);
|
||
data = 0x00;
|
||
return true;
|
||
}
|
||
printf("unhandled MMIO Read at %04X\n", addr);
|
||
fflush(stdout); exit(0);
|
||
}
|
||
for(auto r : regions_by_page[addr / 256]) {
|
||
if(r->read(addr, data)) {
|
||
if(debug & DEBUG_RW) printf("read 0x%04X -> 0x%02X from %s\n", addr, data, r->name.c_str());
|
||
return true;
|
||
}
|
||
}
|
||
if((addr & 0xFF00) == 0xC300) {
|
||
if(debug & DEBUG_SWITCH) printf("read 0x%04X, enabling internal C800 ROM\n", addr);
|
||
internal_C800_ROM_selected = true;
|
||
}
|
||
if(addr == 0xCFFF) {
|
||
if(debug & DEBUG_SWITCH) printf("read 0xCFFF, disabling internal C800 ROM\n");
|
||
internal_C800_ROM_selected = false;
|
||
}
|
||
if(debug & DEBUG_WARN) printf("unhandled memory read at %04X\n", addr);
|
||
if(exit_on_memory_fallthrough) {
|
||
printf("unhandled memory read at %04X, aborting\n", addr);
|
||
printf("Switches:\n");
|
||
for(auto sw : switches) {
|
||
printf(" %s: %s\n", sw->name.c_str(), sw->enabled ? "enabled" : "disabled");
|
||
}
|
||
exit(1);
|
||
}
|
||
return false;
|
||
}
|
||
virtual bool write(int addr, unsigned char data)
|
||
{
|
||
#if LK_HACK
|
||
if(addr == 0xBFFE) {
|
||
// Reset protocol.
|
||
if (disassemble_buffer != 0) {
|
||
delete[] disassemble_buffer;
|
||
disassemble_buffer = 0;
|
||
}
|
||
disassemble_state = 0;
|
||
return true;
|
||
} else if (addr == 0xBFFF) {
|
||
// We dribble our meta-data in one byte at a time.
|
||
switch (disassemble_state) {
|
||
case 0:
|
||
// LSB of size.
|
||
disassemble_size = data;
|
||
disassemble_state++;
|
||
break;
|
||
|
||
case 1:
|
||
// MSB of size.
|
||
disassemble_size |= data << 8;
|
||
disassemble_buffer = new unsigned char[disassemble_size];
|
||
disassemble_index = 0;
|
||
printf("Size of buffer: %d bytes\n", disassemble_size);
|
||
|
||
disassemble_state++;
|
||
break;
|
||
|
||
case 2:
|
||
// LSB of address.
|
||
disassemble_addr = data;
|
||
disassemble_state++;
|
||
break;
|
||
|
||
case 3:
|
||
// MSB of address.
|
||
disassemble_addr |= data << 8;
|
||
disassemble_state++;
|
||
break;
|
||
|
||
case 4:
|
||
// Add byte to disassembly buffer. Disassemble if full.
|
||
if (disassemble_buffer != 0) {
|
||
disassemble_buffer[disassemble_index++] = data;
|
||
|
||
if (disassemble_index == disassemble_size) {
|
||
int bytes;
|
||
string dis;
|
||
for (int i = 0; i < disassemble_size;
|
||
i += bytes, disassemble_addr += bytes) {
|
||
|
||
tie(bytes, dis) = disassemble_6502(disassemble_addr,
|
||
disassemble_buffer + i);
|
||
|
||
printf("%-32s", dis.c_str());
|
||
if (bytes == 3) {
|
||
// Print function name if we have it.
|
||
int jump_address = disassemble_buffer[i + 1] +
|
||
(disassemble_buffer[i + 2] << 8);
|
||
auto search = address_to_function_name.find(jump_address);
|
||
if (search != address_to_function_name.end()) {
|
||
printf(" ; %s", search->second.c_str());
|
||
}
|
||
}
|
||
printf("\n");
|
||
}
|
||
printf("---\n");
|
||
delete[] disassemble_buffer;
|
||
disassemble_buffer = 0;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
return true;
|
||
}
|
||
#endif
|
||
#if 0
|
||
if(text_page1.write(addr, data) ||
|
||
text_page1x.write(addr, data) ||
|
||
text_page2.write(addr, data) ||
|
||
text_page2x.write(addr, data) ||
|
||
hires_page1.write(addr, data) ||
|
||
hires_page1x.write(addr, data) ||
|
||
hires_page2.write(addr, data) ||
|
||
hires_page2x.write(addr, data))
|
||
#else
|
||
if(((addr >= 0x400) && (addr <= 0xBFF)) || ((addr >= 0x2000) && (addr <= 0x5FFF)))
|
||
#endif
|
||
{
|
||
display_write(addr, write_to_aux_text1(), data);
|
||
}
|
||
for(auto b : boards) {
|
||
if(b->write(addr, data)) {
|
||
return true;
|
||
}
|
||
}
|
||
if(io_region.contains(addr)) {
|
||
if(exit_on_banking && (banking_write_switches.find(addr) != banking_write_switches.end())) {
|
||
printf("bank switch control %04X, exiting\n", addr);
|
||
exit(1);
|
||
}
|
||
SoftSwitch* sw = switches_by_address[addr - 0xC000];
|
||
if(sw != NULL) {
|
||
if(addr == sw->set_address) {
|
||
if(!sw->implemented) { printf("%s ; set is unimplemented\n", sw->name.c_str()); fflush(stdout); exit(0); }
|
||
data = 0xff;
|
||
sw->enabled = true;
|
||
if(debug & DEBUG_SWITCH) printf("Set %s\n", sw->name.c_str());
|
||
post_soft_switch_mode_change();
|
||
return true;
|
||
} else if(addr == sw->clear_address) {
|
||
// if(!sw->implemented) { printf("%s ; unimplemented\n", sw->name.c_str()); fflush(stdout); exit(0); }
|
||
data = 0xff;
|
||
sw->enabled = false;
|
||
if(debug & DEBUG_SWITCH) printf("Clear %s\n", sw->name.c_str());
|
||
post_soft_switch_mode_change();
|
||
return true;
|
||
}
|
||
}
|
||
if((addr & 0xFFF0) == 0xC080) {
|
||
C08X_bank = ((addr >> 3) & 1) ? BANK1 : BANK2;
|
||
C08X_write_RAM = addr & 1;
|
||
int read_ROM = ((addr >> 1) & 1) ^ C08X_write_RAM;
|
||
C08X_read_RAM = !read_ROM;
|
||
if(debug & DEBUG_SWITCH) printf("write %04X switch, %s, %d write_RAM, %d read_RAM\n", addr, (C08X_bank == BANK1) ? "BANK1" : "BANK2", C08X_write_RAM, C08X_read_RAM);
|
||
data = 0x00;
|
||
return true;
|
||
}
|
||
if(addr == 0xC010) {
|
||
if(debug & DEBUG_RW) printf("write KBDSTRB\n");
|
||
if(!keyboard_buffer.empty()) {
|
||
keyboard_buffer.pop_front();
|
||
}
|
||
// reset keyboard latch
|
||
return true;
|
||
}
|
||
if(addr == 0xC030) {
|
||
if(debug & DEBUG_RW) printf("write SPKR\n");
|
||
fill_flush_audio();
|
||
data = 0x00;
|
||
where_in_waveform = 0;
|
||
speaker_transitioning_to_high = !speaker_transitioning_to_high;
|
||
return true;
|
||
}
|
||
printf("unhandled MMIO Write at %04X\n", addr);
|
||
fflush(stdout); exit(0);
|
||
}
|
||
for(auto r : regions_by_page[addr / 256]) {
|
||
if(r->write(addr, data)) {
|
||
if(debug & DEBUG_RW) printf("wrote %02X to 0x%04X in %s\n", addr, data, r->name.c_str());
|
||
return true;
|
||
}
|
||
}
|
||
if(debug & DEBUG_WARN) printf("unhandled memory write to %04X\n", addr);
|
||
if(exit_on_memory_fallthrough) {
|
||
printf("unhandled memory write to %04X, exiting\n", addr);
|
||
exit(1);
|
||
}
|
||
return false;
|
||
}
|
||
};
|
||
|
||
struct bus_frontend
|
||
{
|
||
board_base* board;
|
||
map<int, vector<unsigned char> > writes;
|
||
map<int, vector<unsigned char> > reads;
|
||
|
||
unsigned char read(int addr)
|
||
{
|
||
unsigned char data = 0xaa;
|
||
if(board->read(addr & 0xFFFF, data)) {
|
||
if(debug & DEBUG_BUS) printf("read %04X returned %02X\n", addr & 0xFFFF, data);
|
||
// reads[addr & 0xFFFF].push_back(data);
|
||
return data;
|
||
}
|
||
if(debug & DEBUG_ERROR)
|
||
fprintf(stderr, "no ownership of read at %04X\n", addr & 0xFFFF);
|
||
return 0xAA;
|
||
}
|
||
void write(int addr, unsigned char data)
|
||
{
|
||
if(board->write(addr & 0xFFFF, data)) {
|
||
if(debug & DEBUG_BUS) printf("write %04X %02X\n", addr & 0xFFFF, data);
|
||
// writes[addr & 0xFFFF].push_back(data);
|
||
return;
|
||
}
|
||
if(debug & DEBUG_ERROR)
|
||
fprintf(stderr, "no ownership of write %02X at %04X\n", data, addr & 0xFFFF);
|
||
}
|
||
|
||
void reset()
|
||
{
|
||
board->reset();
|
||
}
|
||
};
|
||
|
||
bus_frontend bus;
|
||
|
||
extern "C" {
|
||
|
||
uint8_t read6502(uint16_t address)
|
||
{
|
||
return bus.read(address);
|
||
}
|
||
|
||
void write6502(uint16_t address, uint8_t value)
|
||
{
|
||
bus.write(address, value);
|
||
}
|
||
|
||
};
|
||
|
||
bool sbc_overflow_d(unsigned char a, unsigned char b, int borrow)
|
||
{
|
||
// ??
|
||
signed char a_ = a;
|
||
signed char b_ = b;
|
||
signed short c = a_ - (b_ + borrow);
|
||
return (c < 0) || (c > 99);
|
||
}
|
||
|
||
bool adc_overflow_d(unsigned char a, unsigned char b, int carry)
|
||
{
|
||
// ??
|
||
signed char a_ = a;
|
||
signed char b_ = b;
|
||
signed short c = a_ + b_ + carry;
|
||
return (c < 0) || (c > 99);
|
||
}
|
||
|
||
bool sbc_overflow(unsigned char a, unsigned char b, int borrow)
|
||
{
|
||
signed char a_ = a;
|
||
signed char b_ = b;
|
||
signed short c = a_ - (b_ + borrow);
|
||
return (c < -128) || (c > 127);
|
||
}
|
||
|
||
bool adc_overflow(unsigned char a, unsigned char b, int carry)
|
||
{
|
||
signed char a_ = a;
|
||
signed char b_ = b;
|
||
signed short c = a_ + b_ + carry;
|
||
return (c < -128) || (c > 127);
|
||
}
|
||
|
||
struct CPU6502
|
||
{
|
||
system_clock &clk;
|
||
|
||
unsigned char a, x, y, s, p;
|
||
static const unsigned char N = 0x80;
|
||
static const unsigned char V = 0x40;
|
||
static const unsigned char B = 0x10;
|
||
static const unsigned char D = 0x08;
|
||
static const unsigned char I = 0x04;
|
||
static const unsigned char Z = 0x02;
|
||
static const unsigned char C = 0x01;
|
||
int pc = 0;
|
||
enum Exception {
|
||
NONE,
|
||
RESET,
|
||
NMI,
|
||
BRK,
|
||
INT,
|
||
} exception;
|
||
CPU6502(system_clock& clk_) :
|
||
clk(clk_),
|
||
a(0),
|
||
x(0),
|
||
y(0),
|
||
s(0),
|
||
p(0x20),
|
||
exception(RESET)
|
||
{
|
||
}
|
||
void stack_push(bus_frontend& bus, unsigned char d)
|
||
{
|
||
bus.write(0x100 + s--, d);
|
||
}
|
||
unsigned char stack_pull(bus_frontend& bus)
|
||
{
|
||
return bus.read(0x100 + ++s);
|
||
}
|
||
unsigned char read_pc_inc(bus_frontend& bus)
|
||
{
|
||
return bus.read(pc++);
|
||
}
|
||
void flag_change(unsigned char flag, bool v)
|
||
{
|
||
if(v)
|
||
p |= flag;
|
||
else
|
||
p &= ~flag;
|
||
}
|
||
void flag_set(unsigned char flag)
|
||
{
|
||
p |= flag;
|
||
}
|
||
void flag_clear(unsigned char flag)
|
||
{
|
||
p &= ~flag;
|
||
}
|
||
void reset(bus_frontend& bus)
|
||
{
|
||
s = 0xFD;
|
||
pc = bus.read(0xFFFC) + bus.read(0xFFFD) * 256;
|
||
exception = NONE;
|
||
}
|
||
void irq(bus_frontend& bus)
|
||
{
|
||
stack_push(bus, (pc + 0) >> 8);
|
||
stack_push(bus, (pc + 0) & 0xFF);
|
||
stack_push(bus, p);
|
||
pc = bus.read(0xFFFE) + bus.read(0xFFFF) * 256;
|
||
exception = NONE;
|
||
}
|
||
void brk(bus_frontend& bus)
|
||
{
|
||
stack_push(bus, (pc - 1) >> 8);
|
||
stack_push(bus, (pc - 1) & 0xFF);
|
||
stack_push(bus, p | B); // | B says the Synertek 6502 reference
|
||
pc = bus.read(0xFFFE) + bus.read(0xFFFF) * 256;
|
||
exception = NONE;
|
||
}
|
||
void nmi(bus_frontend& bus)
|
||
{
|
||
stack_push(bus, (pc + 0) >> 8);
|
||
stack_push(bus, (pc + 0) & 0xFF);
|
||
stack_push(bus, p);
|
||
pc = bus.read(0xFFFA) + bus.read(0xFFFB) * 256;
|
||
exception = NONE;
|
||
}
|
||
static int cycles[256];
|
||
enum Operand {
|
||
A,
|
||
IMPL,
|
||
REL,
|
||
ABS,
|
||
ABS_X,
|
||
ABS_Y,
|
||
IND,
|
||
X_IND,
|
||
IND_Y,
|
||
ZPG,
|
||
ZPG_X,
|
||
ZPG_Y,
|
||
IMM,
|
||
UND,
|
||
};
|
||
int carry()
|
||
{
|
||
return (p & C) ? 1 : 0;
|
||
}
|
||
bool isset(unsigned char flag)
|
||
{
|
||
return (p & flag) != 0;
|
||
}
|
||
#if 0
|
||
int get_operand(bus_frontend& bus, Operand oper)
|
||
{
|
||
switch(oper)
|
||
{
|
||
case A: return 0;
|
||
case UND: return 0;
|
||
case IMPL: return 0;
|
||
case REL: return (bus.read(pc) + 128) % 256 - 128;
|
||
case ABS: return bus.read(pc) + bus.read(pc + 1) * 256;
|
||
case ABS_Y: return bus.read(pc) + bus.read(pc + 1) * 256 + y + carry;
|
||
case ABS_X: return bus.read(pc) + bus.read(pc + 1) * 256 + x + carry;
|
||
case ZPG: return bus.read(pc);
|
||
case ZPG_Y: return (bus.read(pc) + y) & 0xFF;
|
||
case ZPG_X: return (bus.read(pc) + x) & 0xFF;
|
||
case IND: return bus.read(bus.read(pc) + bus.read(pc + 1) * 256);
|
||
}
|
||
}
|
||
#endif
|
||
void set_flags(unsigned char flags, unsigned char v)
|
||
{
|
||
if(flags & Z)
|
||
flag_change(Z, v == 0x00);
|
||
if(flags & N)
|
||
flag_change(N, v & 0x80);
|
||
}
|
||
void cycle(bus_frontend& bus)
|
||
{
|
||
if(exception == RESET) {
|
||
if(debug & DEBUG_STATE) printf("RESET\n");
|
||
reset(bus);
|
||
} if(exception == NMI) {
|
||
if(debug & DEBUG_STATE) printf("NMI\n");
|
||
nmi(bus);
|
||
} if(exception == INT) {
|
||
if(debug & DEBUG_STATE) printf("INT\n");
|
||
irq(bus);
|
||
}
|
||
// BRK is a special case caused directly by an instruction
|
||
|
||
unsigned char inst = read_pc_inc(bus);
|
||
|
||
unsigned char m;
|
||
|
||
switch(inst) {
|
||
case 0x00: { // BRK
|
||
brk(bus);
|
||
break;
|
||
}
|
||
|
||
case 0xEA: { // NOP
|
||
break;
|
||
}
|
||
|
||
case 0x8A: { // TXA
|
||
set_flags(N | Z, a = x);
|
||
break;
|
||
}
|
||
|
||
case 0xAA: { // TAX
|
||
set_flags(N | Z, x = a);
|
||
break;
|
||
}
|
||
|
||
case 0xBA: { // TSX
|
||
set_flags(N | Z, x = s);
|
||
break;
|
||
}
|
||
|
||
case 0x9A: { // TXS
|
||
s = x;
|
||
break;
|
||
}
|
||
|
||
case 0xA8: { // TAY
|
||
set_flags(N | Z, y = a);
|
||
break;
|
||
}
|
||
|
||
case 0x98: { // TYA
|
||
set_flags(N | Z, a = y);
|
||
break;
|
||
}
|
||
|
||
case 0x18: { // CLC
|
||
flag_clear(C);
|
||
break;
|
||
}
|
||
|
||
case 0x38: { // SEC
|
||
flag_set(C);
|
||
break;
|
||
}
|
||
|
||
case 0xF8: { // SED
|
||
flag_set(D);
|
||
break;
|
||
}
|
||
|
||
case 0xD8: { // CLD
|
||
flag_clear(D);
|
||
break;
|
||
}
|
||
|
||
case 0x58: { // CLI
|
||
flag_clear(I);
|
||
break;
|
||
}
|
||
|
||
case 0x78: { // SEI
|
||
flag_set(I);
|
||
break;
|
||
}
|
||
|
||
case 0xB8: { // CLV
|
||
flag_clear(V);
|
||
break;
|
||
}
|
||
|
||
case 0xC6: { // DEC zpg
|
||
int zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, m = bus.read(zpg) - 1);
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0xDE: { // DEC abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + x;
|
||
set_flags(N | Z, m = bus.read(addr) - 1);
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0xCE: { // DEC abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, m = bus.read(addr) - 1);
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0xCA: { // DEX
|
||
set_flags(N | Z, x = x - 1);
|
||
break;
|
||
}
|
||
|
||
case 0xFE: { // INC abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + x;
|
||
if((addr - x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, m = bus.read(addr) + 1);
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0xEE: { // INC abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, m = bus.read(addr) + 1);
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0xE6: { // INC zpg
|
||
int zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, m = bus.read(zpg) + 1);
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0xF6: { // INC zpg, X
|
||
int zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
set_flags(N | Z, m = bus.read(zpg) + 1);
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0xE8: { // INX
|
||
set_flags(N | Z, x = x + 1);
|
||
break;
|
||
}
|
||
|
||
case 0xC8: { // INY
|
||
set_flags(N | Z, y = y + 1);
|
||
break;
|
||
}
|
||
|
||
case 0x10: { // BPL
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(!isset(N)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x50: { // BVC
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(!isset(V)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x70: { // BVS
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(isset(V)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x30: { // BMI
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(isset(N)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x90: { // BCC
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(!isset(C)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xB0: { // BCS
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(isset(C)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xD0: { // BNE
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(!isset(Z)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xF0: { // BEQ
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if(isset(Z)) {
|
||
clk.add_cpu_cycles(1);
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
}
|
||
break;
|
||
}
|
||
|
||
|
||
case 0xA1: { // LDA (ind, X)
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
set_flags(N | Z, a = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0xB5: { // LDA zpg, X
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = zpg + x;
|
||
set_flags(N | Z, a = bus.read(addr & 0xFF));
|
||
break;
|
||
}
|
||
|
||
case 0xB1: { // LDA ind, Y
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, a = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0xA5: { // LDA zpg
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, a = bus.read(zpg));
|
||
break;
|
||
}
|
||
|
||
case 0xDD: { // CMP abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + x);
|
||
if((addr + x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
case 0xD9: { // CMP abs, Y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + y);
|
||
if((addr + y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
case 0xB9: { // LDA abs, Y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, a = bus.read(addr + y));
|
||
if((addr + y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
break;
|
||
}
|
||
|
||
case 0xBC: { // LDY abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, y = bus.read(addr + x));
|
||
if((addr + x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
break;
|
||
}
|
||
|
||
case 0xBD: { // LDA abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, a = bus.read(addr + x));
|
||
if((addr + x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
break;
|
||
}
|
||
|
||
case 0xF5: { // SBC zpg, X
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
m = bus.read(zpg);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xE5: { // SBC zpg
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xF1: { // SBC ind, Y
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xff) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xF9: { // SBC abs, Y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
unsigned char m = bus.read(addr);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xFD: { // SBC abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + x;
|
||
if((addr - x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
unsigned char m = bus.read(addr);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xED: { // SBC abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
unsigned char m = bus.read(addr);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0xE9: { // SBC imm
|
||
unsigned char m = read_pc_inc(bus);
|
||
int borrow = isset(C) ? 0 : 1;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, !(bcd < m + borrow));
|
||
flag_change(V, sbc_overflow_d(bcd, m, borrow));
|
||
set_flags(N | Z, bcd = bcd - (m + borrow));
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, !(a < (m + borrow)));
|
||
flag_change(V, sbc_overflow(a, m, borrow));
|
||
set_flags(N | Z, a = a - (m + borrow));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x71: { // ADC (ind), Y
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x6D: { // ADC abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x65: { // ADC
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x7D: { // ADC abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + x;
|
||
if((addr - x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x79: { // ADC abs, Y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x69: { // ADC
|
||
m = read_pc_inc(bus);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x0E: { // ASL abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = m << 1);
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0x06: { // ASL
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = m << 1);
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0x16: { // ASL
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read((zpg + x) & 0xFF);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = m << 1);
|
||
bus.write((zpg + x) & 0xFF, m);
|
||
break;
|
||
}
|
||
|
||
case 0x0A: { // ASL
|
||
flag_change(C, a & 0x80);
|
||
set_flags(N | Z, a = a << 1);
|
||
break;
|
||
}
|
||
|
||
case 0x5E: { // LSR abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + x);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = m >> 1);
|
||
bus.write(addr + x, m);
|
||
break;
|
||
}
|
||
|
||
case 0x46: { // LSR
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = m >> 1);
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0x56: { // LSR zpg, X
|
||
unsigned char zpg = read_pc_inc(bus) + x;
|
||
m = bus.read(zpg & 0xFF);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = m >> 1);
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0x4E: { // LSR
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = m >> 1);
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0x4A: { // LSR
|
||
flag_change(C, a & 0x01);
|
||
set_flags(N | Z, a = a >> 1);
|
||
break;
|
||
}
|
||
|
||
case 0x68: { // PLA
|
||
set_flags(N | Z, a = stack_pull(bus));
|
||
break;
|
||
}
|
||
|
||
case 0x48: { // PHA
|
||
stack_push(bus, a);
|
||
break;
|
||
}
|
||
|
||
case 0x01: { // ORA (ind, X)
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x15: { // ORA zpg, X
|
||
int zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
m = bus.read(zpg);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x0D: { // ORA abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x19: { // ORA abs, Y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + y);
|
||
if((addr + y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x1D: { // ORA abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + x);
|
||
if((addr + x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x11: { // ORA (ind), Y
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x05: { // ORA zpg
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0x09: { // ORA imm
|
||
unsigned char imm = read_pc_inc(bus);
|
||
set_flags(N | Z, a = a | imm);
|
||
break;
|
||
}
|
||
|
||
case 0x35: { // AND zpg, X
|
||
int zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
set_flags(N | Z, a = a & bus.read(zpg));
|
||
break;
|
||
}
|
||
|
||
case 0x31: { // AND (ind), y
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, a = a & bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0x3D: { // AND abs, x
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, a = a & bus.read(addr + x));
|
||
if((addr + x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
break;
|
||
}
|
||
|
||
case 0x39: { // AND abs, y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, a = a & bus.read(addr + y));
|
||
if((addr + y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
break;
|
||
}
|
||
|
||
case 0x2D: { // AND abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, a = a & bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0x25: { // AND zpg
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, a = a & bus.read(zpg));
|
||
break;
|
||
}
|
||
|
||
case 0x29: { // AND imm
|
||
unsigned char imm = read_pc_inc(bus);
|
||
set_flags(N | Z, a = a & imm);
|
||
break;
|
||
}
|
||
|
||
case 0x88: { // DEY
|
||
set_flags(N | Z, y = y - 1);
|
||
break;
|
||
}
|
||
|
||
case 0x7E: { // ROR abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + x);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = (c ? 0x80 : 0x00) | (m >> 1));
|
||
bus.write(addr + x, m);
|
||
break;
|
||
}
|
||
|
||
case 0x36: { // ROL zpg,X
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
m = bus.read(zpg);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = (c ? 0x01 : 0x00) | (m << 1));
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
|
||
case 0x3E: { // ROL abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + x);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = (c ? 0x01 : 0x00) | (m << 1));
|
||
bus.write(addr + x, m);
|
||
break;
|
||
}
|
||
|
||
case 0x2A: { // ROL
|
||
bool c = isset(C);
|
||
flag_change(C, a & 0x80);
|
||
set_flags(N | Z, a = (c ? 0x01 : 0x00) | (a << 1));
|
||
break;
|
||
}
|
||
|
||
case 0x6A: { // ROR
|
||
bool c = isset(C);
|
||
flag_change(C, a & 0x01);
|
||
set_flags(N | Z, a = (c ? 0x80 : 0x00) | (a >> 1));
|
||
break;
|
||
}
|
||
|
||
case 0x6E: { // ROR abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = (c ? 0x80 : 0x00) | (m >> 1));
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
case 0x66: { // ROR
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = (c ? 0x80 : 0x00) | (m >> 1));
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0x76: { // ROR
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
m = bus.read(zpg);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x01);
|
||
set_flags(N | Z, m = (c ? 0x80 : 0x00) | (m >> 1));
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0x2E: { // ROL abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
bool c = isset(C);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = (c ? 0x01 : 0x00) | (m << 1));
|
||
bus.write(addr, m);
|
||
break;
|
||
}
|
||
|
||
|
||
case 0x26: { // ROL
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bool c = isset(C);
|
||
m = bus.read(zpg);
|
||
flag_change(C, m & 0x80);
|
||
set_flags(N | Z, m = (c ? 0x01 : 0x00) | (m << 1));
|
||
bus.write(zpg, m);
|
||
break;
|
||
}
|
||
|
||
case 0x4C: { // JMP
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
pc = addr;
|
||
break;
|
||
}
|
||
|
||
case 0x6C: { // JMP
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
unsigned char addrl = bus.read(addr);
|
||
unsigned char addrh = bus.read(addr + 1);
|
||
addr = addrl + addrh * 256;
|
||
pc = addr;
|
||
break;
|
||
}
|
||
|
||
case 0x9D: { // STA abs, x
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
bus.write(addr + x, a);
|
||
break;
|
||
}
|
||
|
||
case 0x99: { // STA
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
bus.write(addr + y, a);
|
||
break;
|
||
}
|
||
|
||
case 0x91: { // STA (ind), Y
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
bus.write(addr, a);
|
||
break;
|
||
}
|
||
|
||
case 0x81: { // STA (ind, X)
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
bus.write(addr, a);
|
||
break;
|
||
}
|
||
|
||
case 0x8D: { // STA
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
bus.write(addr, a);
|
||
break;
|
||
}
|
||
|
||
case 0x08: { // PHP
|
||
stack_push(bus, p);
|
||
break;
|
||
}
|
||
|
||
case 0x28: { // PLP
|
||
p = stack_pull(bus);
|
||
break;
|
||
}
|
||
|
||
case 0x24: { // BIT
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
flag_change(Z, (a & m) == 0);
|
||
flag_change(N, m & 0x80);
|
||
flag_change(V, m & 0x40);
|
||
break;
|
||
}
|
||
|
||
case 0x2C: { // BIT
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(Z, (a & m) == 0);
|
||
flag_change(N, m & 0x80);
|
||
flag_change(V, m & 0x40);
|
||
break;
|
||
}
|
||
|
||
case 0xB4: { // LDY
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, y = bus.read((zpg + x) & 0xFF));
|
||
break;
|
||
}
|
||
|
||
case 0xAE: { // LDX abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, x = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0xBE: { // LDX
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, x = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0xA6: { // LDX
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, x = bus.read(zpg));
|
||
break;
|
||
}
|
||
|
||
case 0xA4: { // LDY
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, y = bus.read(zpg));
|
||
break;
|
||
}
|
||
|
||
case 0xAC: { // LDY
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, y = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0xA2: { // LDX
|
||
unsigned char imm = read_pc_inc(bus);
|
||
set_flags(N | Z, x = imm);
|
||
break;
|
||
}
|
||
|
||
case 0xA0: { // LDY
|
||
unsigned char imm = read_pc_inc(bus);
|
||
set_flags(N | Z, y = imm);
|
||
break;
|
||
}
|
||
|
||
case 0xA9: { // LDA
|
||
unsigned char imm = read_pc_inc(bus);
|
||
set_flags(N | Z, a = imm);
|
||
break;
|
||
}
|
||
|
||
case 0xAD: { // LDA
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
set_flags(N | Z, a = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0xCC: { // CPY abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(C, m <= y);
|
||
set_flags(N | Z, m = y - m);
|
||
break;
|
||
}
|
||
|
||
case 0xEC: { // CPX abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(C, m <= x);
|
||
set_flags(N | Z, m = x - m);
|
||
break;
|
||
}
|
||
|
||
case 0xE0: { // CPX
|
||
unsigned char imm = read_pc_inc(bus);
|
||
flag_change(C, imm <= x);
|
||
set_flags(N | Z, imm = x - imm);
|
||
break;
|
||
}
|
||
|
||
case 0xC0: { // CPY
|
||
unsigned char imm = read_pc_inc(bus);
|
||
flag_change(C, imm <= y);
|
||
set_flags(N | Z, imm = y - imm);
|
||
break;
|
||
}
|
||
|
||
case 0x55: { // EOR zpg, X
|
||
unsigned char zpg = read_pc_inc(bus) + x;
|
||
m = bus.read(zpg & 0xFF);
|
||
set_flags(N | Z, a = a ^ m);
|
||
break;
|
||
}
|
||
|
||
case 0x41: { // EOR (ind, X)
|
||
unsigned char zpg = (read_pc_inc(bus) + x) & 0xFF;
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a ^ m);
|
||
break;
|
||
}
|
||
|
||
case 0x4D: { // EOR abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a ^ m);
|
||
break;
|
||
}
|
||
|
||
case 0x5D: { // EOR abs, X
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + x);
|
||
if((addr + x) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, a = a ^ m);
|
||
break;
|
||
}
|
||
|
||
case 0x59: { // EOR abs, Y
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr + y);
|
||
if((addr + y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
set_flags(N | Z, a = a ^ m);
|
||
break;
|
||
}
|
||
|
||
case 0x45: { // EOR
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
set_flags(N | Z, a = a ^ bus.read(zpg));
|
||
break;
|
||
}
|
||
|
||
case 0x49: { // EOR
|
||
unsigned char imm = read_pc_inc(bus);
|
||
set_flags(N | Z, a = a ^ imm);
|
||
break;
|
||
}
|
||
|
||
case 0x51: { // EOR
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a ^ m);
|
||
break;
|
||
}
|
||
|
||
case 0xD1: { // CMP
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256 + y;
|
||
if((addr - y) / 256 != addr / 256)
|
||
clk.add_cpu_cycles(1);
|
||
m = bus.read(addr);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
case 0xC5: { // CMP
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
case 0xCD: { // CMP
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
case 0xC9: { // CMP
|
||
unsigned char imm = read_pc_inc(bus);
|
||
flag_change(C, imm <= a);
|
||
set_flags(N | Z, imm = a - imm);
|
||
break;
|
||
}
|
||
|
||
case 0xD5: { // CMP
|
||
unsigned char zpg = read_pc_inc(bus) + x;
|
||
m = bus.read(zpg & 0xFF);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
case 0xE4: { // CPX
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
flag_change(C, m <= x);
|
||
set_flags(N | Z, m = x - m);
|
||
break;
|
||
}
|
||
|
||
case 0xC4: { // CPY
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
m = bus.read(zpg);
|
||
flag_change(C, m <= y);
|
||
set_flags(N | Z, m = y - m);
|
||
break;
|
||
}
|
||
|
||
case 0x85: { // STA
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bus.write(zpg, a);
|
||
break;
|
||
}
|
||
|
||
case 0x40: { // RTI
|
||
p = stack_pull(bus);
|
||
unsigned char pcl = stack_pull(bus);
|
||
unsigned char pch = stack_pull(bus);
|
||
pc = pcl + pch * 256 + 1;
|
||
break;
|
||
}
|
||
|
||
case 0x60: { // RTS
|
||
unsigned char pcl = stack_pull(bus);
|
||
unsigned char pch = stack_pull(bus);
|
||
pc = pcl + pch * 256 + 1;
|
||
break;
|
||
}
|
||
|
||
case 0x95: { // STA
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bus.write((zpg + x) & 0xFF, a);
|
||
break;
|
||
}
|
||
|
||
case 0x94: { // STY
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bus.write((zpg + x) & 0xFF, y);
|
||
break;
|
||
}
|
||
|
||
case 0x8E: { // STX abs
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
bus.write(addr, x);
|
||
break;
|
||
}
|
||
|
||
case 0x86: { // STX
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bus.write(zpg, x);
|
||
break;
|
||
}
|
||
|
||
case 0x84: { // STY
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bus.write(zpg, y);
|
||
break;
|
||
}
|
||
|
||
case 0x8C: { // STY
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
bus.write(addr, y);
|
||
break;
|
||
}
|
||
|
||
case 0x20: { // JSR
|
||
stack_push(bus, (pc + 1) >> 8);
|
||
stack_push(bus, (pc + 1) & 0xFF);
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
pc = addr;
|
||
break;
|
||
}
|
||
|
||
// 65C02 instructions
|
||
|
||
case 0x80: { // BRA imm, 65C02
|
||
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
|
||
if((pc + rel) / 256 != pc / 256)
|
||
clk.add_cpu_cycles(1);
|
||
pc += rel;
|
||
break;
|
||
}
|
||
|
||
case 0x64: { // STZ zpg, 65C02
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
bus.write(zpg, 0);
|
||
break;
|
||
}
|
||
|
||
case 0x9C: { // STZ abs, 65C02
|
||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||
bus.write(addr, 0x0);
|
||
break;
|
||
}
|
||
|
||
case 0xDA: { // PHX, 65C02
|
||
stack_push(bus, x);
|
||
break;
|
||
}
|
||
|
||
case 0xB2: { // LDA (zpg), 65C02
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
set_flags(N | Z, a = bus.read(addr));
|
||
break;
|
||
}
|
||
|
||
case 0x92: { // STA (zpg), 65C02
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
bus.write(addr, a);
|
||
break;
|
||
}
|
||
|
||
case 0x72: { // ADC (zpg), 65C02
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
|
||
m = bus.read(addr);
|
||
int carry = isset(C) ? 1 : 0;
|
||
if(isset(D)) {
|
||
unsigned char bcd = a / 16 * 10 + a % 16;
|
||
flag_change(C, (int)(bcd + m + carry) > 99);
|
||
flag_change(V, adc_overflow_d(bcd, m, carry));
|
||
set_flags(N | Z, bcd = bcd + m + carry);
|
||
a = bcd / 10 * 16 + bcd % 10;
|
||
} else {
|
||
flag_change(C, (int)(a + m + carry) > 0xFF);
|
||
flag_change(V, adc_overflow(a, m, carry));
|
||
set_flags(N | Z, a = a + m + carry);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case 0x3A: { // DEC, 65C02
|
||
set_flags(N | Z, a = a - 1);
|
||
break;
|
||
}
|
||
|
||
case 0x1A: { // INC, 65C02
|
||
set_flags(N | Z, a = a + 1);
|
||
break;
|
||
}
|
||
|
||
case 0x12: { // ORA (ind), 65C02
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
m = bus.read(addr);
|
||
set_flags(N | Z, a = a | m);
|
||
break;
|
||
}
|
||
|
||
case 0xD2: { // CMP (zpg), 65C02 instruction
|
||
unsigned char zpg = read_pc_inc(bus);
|
||
int addr = bus.read(zpg) + bus.read((zpg + 1) & 0xFF) * 256;
|
||
m = bus.read(addr);
|
||
flag_change(C, m <= a);
|
||
set_flags(N | Z, m = a - m);
|
||
break;
|
||
}
|
||
|
||
default:
|
||
printf("unhandled instruction %02X at %04X\n", inst, pc - 1);
|
||
fflush(stdout); exit(1);
|
||
}
|
||
if(debug & DEBUG_STATE) {
|
||
unsigned char s0 = bus.read(0x100 + s + 0);
|
||
unsigned char s1 = bus.read(0x100 + s + 1);
|
||
unsigned char s2 = bus.read(0x100 + s + 2);
|
||
unsigned char pc0 = bus.read(pc + 0);
|
||
unsigned char pc1 = bus.read(pc + 1);
|
||
unsigned char pc2 = bus.read(pc + 2);
|
||
printf("6502: A:%02X X:%02X Y:%02X P:", a, x, y);
|
||
printf("%s", (p & N) ? "N" : "n");
|
||
printf("%s", (p & V) ? "V" : "v");
|
||
printf("-");
|
||
printf("%s", (p & B) ? "B" : "b");
|
||
printf("%s", (p & D) ? "D" : "d");
|
||
printf("%s", (p & I) ? "I" : "i");
|
||
printf("%s", (p & Z) ? "Z" : "z");
|
||
printf("%s ", (p & C) ? "C" : "c");
|
||
printf("S:%02X (%02X %02X %02X ...) PC:%04X (%02X %02X %02X ...)\n", s, s0, s1, s2, pc, pc0, pc1, pc2);
|
||
}
|
||
assert(cycles[inst] > 0);
|
||
clk.add_cpu_cycles(cycles[inst]);
|
||
}
|
||
};
|
||
|
||
int CPU6502::cycles[256] =
|
||
{
|
||
/* 0x0- */ 7, 6, -1, -1, -1, 3, 5, -1, 3, 2, 2, -1, -1, 4, 6, -1,
|
||
/* 0x1- */ 2, 5, 5, -1, -1, 4, 6, -1, 2, 4, 2, -1, -1, 4, 7, -1,
|
||
/* 0x2- */ 6, 6, -1, -1, 3, 3, 5, -1, 4, 2, 2, -1, 4, 4, 6, -1,
|
||
/* 0x3- */ 2, 5, -1, -1, -1, 4, 6, -1, 2, 4, 2, -1, -1, 4, 7, -1,
|
||
/* 0x4- */ 6, 6, -1, -1, -1, 3, 5, -1, 3, 2, 2, -1, 3, 4, 6, -1,
|
||
/* 0x5- */ 2, 5, -1, -1, -1, 4, 6, -1, 2, 4, -1, -1, -1, 4, 7, -1,
|
||
/* 0x6- */ 6, 6, -1, -1, 3, 3, 5, -1, 4, 2, 2, -1, 5, 4, 6, -1,
|
||
/* 0x7- */ 2, 5, 5, -1, -1, 4, 6, -1, 2, 4, -1, -1, -1, 4, 7, -1,
|
||
/* 0x8- */ 2, 6, -1, -1, 3, 3, 3, -1, 2, -1, 2, -1, 4, 4, 4, -1,
|
||
/* 0x9- */ 2, 6, 5, -1, 4, 4, 4, -1, 2, 5, 2, -1, 4, 5, -1, -1,
|
||
/* 0xA- */ 2, 6, 2, -1, 3, 3, 3, -1, 2, 2, 2, -1, 4, 4, 4, -1,
|
||
/* 0xB- */ 2, 5, 5, -1, 4, 4, 4, -1, 2, 4, 2, -1, 4, 4, 4, -1,
|
||
/* 0xC- */ 2, 6, -1, -1, 3, 3, 5, -1, 2, 2, 2, -1, 4, 4, 3, -1,
|
||
/* 0xD- */ 2, 5, 5, -1, -1, 4, 6, -1, 2, 4, 3, -1, -1, 4, 7, -1,
|
||
/* 0xE- */ 2, 6, -1, -1, 3, 3, 5, -1, 2, 2, 2, -1, 4, 4, 6, -1,
|
||
/* 0xF- */ 2, 5, -1, -1, -1, 4, 6, -1, 2, 4, -1, -1, -1, 4, 7, -1,
|
||
};
|
||
|
||
void usage(char *progname)
|
||
{
|
||
printf("\n");
|
||
printf("usage: %s [-debugger] [-fast] [-map ld65.map] ROM.bin\n", progname);
|
||
printf("\n");
|
||
printf("\n");
|
||
}
|
||
|
||
bool debugging = false;
|
||
|
||
void cleanup(void)
|
||
{
|
||
fflush(stdout);
|
||
fflush(stderr);
|
||
}
|
||
|
||
bool use_fake6502 = false;
|
||
|
||
struct saved_inst {
|
||
int pc;
|
||
unsigned char bytes[4];
|
||
};
|
||
|
||
void disassemble_previous_instructions(deque<saved_inst>& previous_instructions)
|
||
{
|
||
for(auto it : previous_instructions) {
|
||
int bytes;
|
||
string dis;
|
||
tie(bytes, dis) = disassemble_6502(it.pc, it.bytes);
|
||
printf("%s\n", dis.c_str());
|
||
}
|
||
}
|
||
|
||
const int max_previous_instructions = 100;
|
||
|
||
void read_instruction_and_save(bus_frontend &bus, int pc, deque<saved_inst>& previous_instructions)
|
||
{
|
||
saved_inst inst;
|
||
|
||
inst.pc = pc;
|
||
inst.bytes[0] = bus.read(pc + 0);
|
||
inst.bytes[1] = bus.read(pc + 1);
|
||
inst.bytes[2] = bus.read(pc + 2);
|
||
inst.bytes[3] = bus.read(pc + 3);
|
||
if(previous_instructions.size() > max_previous_instructions)
|
||
previous_instructions.pop_front();
|
||
previous_instructions.push_back(inst);
|
||
}
|
||
|
||
string read_bus_and_disassemble(bus_frontend &bus, int pc)
|
||
{
|
||
int bytes;
|
||
string dis;
|
||
unsigned char buf[4];
|
||
buf[0] = bus.read(pc + 0);
|
||
buf[1] = bus.read(pc + 1);
|
||
buf[2] = bus.read(pc + 2);
|
||
buf[3] = bus.read(pc + 3);
|
||
tie(bytes, dis) = disassemble_6502(pc - 1, buf);
|
||
return dis;
|
||
}
|
||
|
||
int millis_per_slice = 16;
|
||
|
||
struct key_to_ascii
|
||
{
|
||
unsigned char no_shift_no_control;
|
||
unsigned char yes_shift_no_control;
|
||
unsigned char no_shift_yes_control;
|
||
unsigned char yes_shift_yes_control;
|
||
};
|
||
|
||
map<int, key_to_ascii> interface_key_to_apple2e =
|
||
{
|
||
{'A', {97, 65, 1, 1}},
|
||
{'B', {98, 66, 2, 2}},
|
||
{'C', {99, 67, 3, 3}},
|
||
{'D', {100, 68, 4, 4}},
|
||
{'E', {101, 69, 5, 5}},
|
||
{'F', {102, 70, 6, 6}},
|
||
{'G', {103, 71, 7, 7}},
|
||
{'H', {104, 72, 8, 8}},
|
||
{'I', {105, 73, 9, 9}},
|
||
{'J', {106, 74, 10, 10}},
|
||
{'K', {107, 75, 11, 11}},
|
||
{'L', {108, 76, 12, 12}},
|
||
{'M', {109, 77, 13, 13}},
|
||
{'N', {110, 78, 14, 14}},
|
||
{'O', {111, 79, 15, 15}},
|
||
{'P', {112, 80, 16, 16}},
|
||
{'Q', {113, 81, 17, 17}},
|
||
{'R', {114, 82, 18, 18}},
|
||
{'S', {115, 83, 19, 19}},
|
||
{'T', {116, 84, 20, 20}},
|
||
{'U', {117, 85, 21, 21}},
|
||
{'V', {118, 86, 22, 22}},
|
||
{'W', {119, 87, 23, 23}},
|
||
{'X', {120, 88, 24, 24}},
|
||
{'Y', {121, 89, 25, 25}},
|
||
{'Z', {122, 90, 26, 26}},
|
||
{'1', {'1', '!', 0, 0}},
|
||
{'2', {'2', '@', 0, 0}},
|
||
{'3', {'3', '#', 0, 0}},
|
||
{'4', {'4', '$', 0, 0}},
|
||
{'5', {'5', '%', 0, 0}},
|
||
{'6', {'6', '^', 0, 0}},
|
||
{'7', {'7', '&', 0, 0}},
|
||
{'8', {'8', '*', 0, 0}},
|
||
{'9', {'9', '(', 0, 0}},
|
||
{'0', {'0', ')', 0, 0}},
|
||
{'-', {'-', '_', 0, 0}},
|
||
{'=', {'=', '+', 0, 0}},
|
||
{'[', {'[', '{', 0, 0}},
|
||
{']', {']', '}', 0, 0}},
|
||
{'\\', {'\\', '|', 0, 0}},
|
||
{';', {';', ':', 0, 0}},
|
||
{'\'', {'\'', '"', 0, 0}},
|
||
{',', {',', '<', 0, 0}},
|
||
{'.', {'.', '>', 0, 0}},
|
||
{'/', {'/', '?', 0, 0}},
|
||
{'`', {'`', '~', 0, 0}},
|
||
{' ', {' ', ' ', 0, 0}},
|
||
};
|
||
|
||
DISKIIboard *diskIIboard;
|
||
Mockingboard *mockingboard;
|
||
|
||
enum APPLE2Einterface::EventType process_events(MAINboard *board, bus_frontend& bus, CPU6502& cpu)
|
||
{
|
||
static bool shift_down = false;
|
||
static bool control_down = false;
|
||
static bool caps_down = false;
|
||
|
||
while(APPLE2Einterface::event_waiting()) {
|
||
APPLE2Einterface::event e = APPLE2Einterface::dequeue_event();
|
||
if(e.type == APPLE2Einterface::EJECT_FLOPPY) {
|
||
diskIIboard->set_floppy(e.value, NULL);
|
||
} else if(e.type == APPLE2Einterface::INSERT_FLOPPY) {
|
||
diskIIboard->set_floppy(e.value, e.str);
|
||
free(e.str);
|
||
} else if(e.type == APPLE2Einterface::PASTE) {
|
||
for(unsigned int i = 0; i < strlen(e.str); i++)
|
||
if(e.str[i] == '\n')
|
||
board->enqueue_key('\r');
|
||
else
|
||
board->enqueue_key(e.str[i]);
|
||
free(e.str);
|
||
} else if(e.type == APPLE2Einterface::KEYDOWN) {
|
||
if((e.value == APPLE2Einterface::LEFT_SHIFT) || (e.value == APPLE2Einterface::RIGHT_SHIFT))
|
||
shift_down = true;
|
||
else if((e.value == APPLE2Einterface::LEFT_CONTROL) || (e.value == APPLE2Einterface::RIGHT_CONTROL))
|
||
control_down = true;
|
||
else if(e.value == APPLE2Einterface::CAPS_LOCK) {
|
||
caps_down = true;
|
||
} else if(e.value == APPLE2Einterface::ENTER) {
|
||
board->enqueue_key(141 - 128);
|
||
} else if(e.value == APPLE2Einterface::TAB) {
|
||
board->enqueue_key(' ');
|
||
} else if(e.value == APPLE2Einterface::ESCAPE) {
|
||
board->enqueue_key('');
|
||
} else if(e.value == APPLE2Einterface::BACKSPACE) {
|
||
if(delete_is_left_arrow) {
|
||
board->enqueue_key(136 - 128);
|
||
} else {
|
||
board->enqueue_key(255 - 128);
|
||
}
|
||
} else if(e.value == APPLE2Einterface::RIGHT) {
|
||
board->enqueue_key(149 - 128);
|
||
} else if(e.value == APPLE2Einterface::LEFT) {
|
||
board->enqueue_key(136 - 128);
|
||
} else if(e.value == APPLE2Einterface::DOWN) {
|
||
board->enqueue_key(138 - 128);
|
||
} else if(e.value == APPLE2Einterface::UP) {
|
||
board->enqueue_key(139 - 128);
|
||
} else {
|
||
auto it = interface_key_to_apple2e.find(e.value);
|
||
if(it != interface_key_to_apple2e.end()) {
|
||
const key_to_ascii& k = (*it).second;
|
||
if(!shift_down) {
|
||
if(!control_down) {
|
||
if(caps_down && (e.value >= 'A') && (e.value <= 'Z'))
|
||
board->enqueue_key(k.yes_shift_no_control);
|
||
else
|
||
board->enqueue_key(k.no_shift_no_control);
|
||
} else
|
||
board->enqueue_key(k.no_shift_yes_control);
|
||
} else {
|
||
if(!control_down)
|
||
board->enqueue_key(k.yes_shift_no_control);
|
||
else
|
||
board->enqueue_key(k.yes_shift_yes_control);
|
||
}
|
||
}
|
||
}
|
||
} else if(e.type == APPLE2Einterface::KEYUP) {
|
||
if((e.value == APPLE2Einterface::LEFT_SHIFT) || (e.value == APPLE2Einterface::RIGHT_SHIFT))
|
||
shift_down = false;
|
||
else if((e.value == APPLE2Einterface::LEFT_CONTROL) || (e.value == APPLE2Einterface::RIGHT_CONTROL))
|
||
control_down = false;
|
||
else if(e.value == APPLE2Einterface::CAPS_LOCK) {
|
||
caps_down = false;
|
||
}
|
||
} if(e.type == APPLE2Einterface::RESET) {
|
||
bus.reset();
|
||
if(use_fake6502)
|
||
reset6502();
|
||
else
|
||
cpu.reset(bus);
|
||
} else if(e.type == APPLE2Einterface::REBOOT) {
|
||
bus.reset();
|
||
board->momentary_open_apple(machine_clock_rate / (5 * 14));
|
||
if(use_fake6502)
|
||
reset6502();
|
||
else
|
||
cpu.reset(bus);
|
||
} else if(e.type == APPLE2Einterface::PAUSE) {
|
||
pause_cpu = e.value;
|
||
} else if(e.type == APPLE2Einterface::SPEED) {
|
||
run_fast = e.value;
|
||
} else if(e.type == APPLE2Einterface::QUIT)
|
||
return e.type;
|
||
}
|
||
return APPLE2Einterface::NONE;
|
||
}
|
||
|
||
extern uint16_t pc;
|
||
|
||
int main(int argc, char **argv)
|
||
{
|
||
char *progname = argv[0];
|
||
argc -= 1;
|
||
argv += 1;
|
||
char *diskII_rom_name = NULL, *floppy1_name = NULL, *floppy2_name = NULL;
|
||
char *map_name = NULL;
|
||
bool mute = false;
|
||
|
||
while((argc > 0) && (argv[0][0] == '-')) {
|
||
if(strcmp(argv[0], "-mute") == 0) {
|
||
mute = true;
|
||
argv++;
|
||
argc--;
|
||
} else if(strcmp(argv[0], "-debugger") == 0) {
|
||
debugging = true;
|
||
argv++;
|
||
argc--;
|
||
} else if(strcmp(argv[0], "-diskII") == 0) {
|
||
if(argc < 4) {
|
||
fprintf(stderr, "-diskII option requires a ROM image filename and two floppy image names (or \"-\") for no floppy image.\n");
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
diskII_rom_name = argv[1];
|
||
floppy1_name = argv[2];
|
||
floppy2_name = argv[3];
|
||
argv += 4;
|
||
argc -= 4;
|
||
} else if(strcmp(argv[0], "-backspace-is-delete") == 0) {
|
||
delete_is_left_arrow = false;
|
||
argv += 1;
|
||
argc -= 1;
|
||
} else if(strcmp(argv[0], "-fast") == 0) {
|
||
run_fast = true;
|
||
argv += 1;
|
||
argc -= 1;
|
||
} else if(strcmp(argv[0], "-d") == 0) {
|
||
debug = atoi(argv[1]);
|
||
if(argc < 2) {
|
||
fprintf(stderr, "-d option requires a debugger mask value.\n");
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
argv += 2;
|
||
argc -= 2;
|
||
} else if(strcmp(argv[0], "-map") == 0) {
|
||
if(argc < 2) {
|
||
fprintf(stderr, "-map option requires an ld65 map filename.\n");
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
map_name = argv[1];
|
||
argv += 2;
|
||
argc -= 2;
|
||
} else if(
|
||
(strcmp(argv[0], "-help") == 0) ||
|
||
(strcmp(argv[0], "-h") == 0) ||
|
||
(strcmp(argv[0], "-?") == 0))
|
||
{
|
||
usage(progname);
|
||
exit(EXIT_SUCCESS);
|
||
} else {
|
||
fprintf(stderr, "unknown parameter \"%s\"\n", argv[0]);
|
||
usage(progname);
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
}
|
||
|
||
if(argc < 1) {
|
||
usage(progname);
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
|
||
char *romname = argv[0];
|
||
unsigned char b[32768];
|
||
|
||
if(!read_blob(romname, b, sizeof(b)))
|
||
exit(EXIT_FAILURE);
|
||
|
||
unsigned char diskII_rom[256];
|
||
if(diskII_rom_name != NULL) {
|
||
if(!read_blob(diskII_rom_name, diskII_rom, sizeof(diskII_rom)))
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
|
||
if(map_name != NULL) {
|
||
if(!read_map(map_name))
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
|
||
system_clock clk;
|
||
|
||
MAINboard* mainboard;
|
||
|
||
MAINboard::display_write_func display = [](int addr, bool aux, unsigned char data)->bool{return APPLE2Einterface::write(addr, aux, data);};
|
||
|
||
MAINboard::get_paddle_func paddle = [](int num)->tuple<float, bool>{return APPLE2Einterface::get_paddle(num);};
|
||
|
||
MAINboard::audio_flush_func audio;
|
||
if(mute)
|
||
audio = [](char *buf, size_t sz){ };
|
||
else
|
||
audio = [](char *buf, size_t sz){ if(!run_fast) APPLE2Einterface::enqueue_audio_samples(buf, sz); };
|
||
|
||
mainboard = new MAINboard(clk, b, display, audio, paddle);
|
||
bus.board = mainboard;
|
||
bus.reset();
|
||
|
||
if(diskII_rom_name != NULL) {
|
||
|
||
if((strcmp(floppy1_name, "-") == 0) ||
|
||
(strcmp(floppy1_name, "none") == 0) ||
|
||
(strcmp(floppy1_name, "") == 0) )
|
||
floppy1_name = NULL;
|
||
|
||
if((strcmp(floppy2_name, "-") == 0) ||
|
||
(strcmp(floppy2_name, "none") == 0) ||
|
||
(strcmp(floppy2_name, "") == 0) )
|
||
floppy2_name = NULL;
|
||
|
||
try {
|
||
DISKIIboard::floppy_activity_func activity = [](int num, bool activity){APPLE2Einterface::show_floppy_activity(num, activity);};
|
||
diskIIboard = new DISKIIboard(diskII_rom, floppy1_name, floppy2_name, activity);
|
||
mainboard->boards.push_back(diskIIboard);
|
||
mockingboard = new Mockingboard();
|
||
mainboard->boards.push_back(mockingboard);
|
||
} catch(const char *msg) {
|
||
cerr << msg << endl;
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
}
|
||
|
||
CPU6502 cpu(clk);
|
||
|
||
atexit(cleanup);
|
||
|
||
if(use_fake6502)
|
||
reset6502();
|
||
|
||
deque<saved_inst> previous_instructions;
|
||
|
||
APPLE2Einterface::start(run_fast, diskII_rom_name != NULL, floppy1_name != NULL, floppy2_name != NULL);
|
||
|
||
chrono::time_point<chrono::system_clock> then = std::chrono::system_clock::now();
|
||
|
||
while(1) {
|
||
if(!debugging) {
|
||
|
||
if(process_events(mainboard, bus, cpu) == APPLE2Einterface::QUIT) {
|
||
break;
|
||
}
|
||
|
||
int clocks_per_slice;
|
||
if(pause_cpu)
|
||
clocks_per_slice = 0;
|
||
else {
|
||
if(run_fast)
|
||
clocks_per_slice = machine_clock_rate / 5;
|
||
else
|
||
clocks_per_slice = millis_per_slice * machine_clock_rate / 1000 * 1.05;
|
||
}
|
||
clk_t prev_clock = clk;
|
||
while(clk - prev_clock < clocks_per_slice) {
|
||
if(debug & DEBUG_DECODE) {
|
||
string dis = read_bus_and_disassemble(bus, use_fake6502 ? pc : cpu.pc);
|
||
printf("%s\n", dis.c_str());
|
||
}
|
||
if(use_fake6502) {
|
||
clockticks6502 = 0;
|
||
step6502();
|
||
clk.add_cpu_cycles(clockticks6502);
|
||
} else {
|
||
cpu.cycle(bus);
|
||
}
|
||
}
|
||
mainboard->sync();
|
||
|
||
APPLE2Einterface::iterate(mode_history, clk.clock_cpu);
|
||
mode_history.clear();
|
||
|
||
chrono::time_point<chrono::system_clock> now = std::chrono::system_clock::now();
|
||
|
||
auto elapsed_millis = chrono::duration_cast<chrono::milliseconds>(now - then);
|
||
if(!run_fast || pause_cpu)
|
||
this_thread::sleep_for(chrono::milliseconds(millis_per_slice) - elapsed_millis);
|
||
|
||
then = now;
|
||
|
||
} else {
|
||
|
||
printf("> ");
|
||
char line[512];
|
||
if(fgets(line, sizeof(line) - 1, stdin) == NULL) {
|
||
exit(0);
|
||
}
|
||
line[strlen(line) - 1] = '\0';
|
||
if(strcmp(line, "go") == 0) {
|
||
printf("continuing\n");
|
||
debugging = false;
|
||
continue;
|
||
} else if(strcmp(line, "fast") == 0) {
|
||
printf("run flat out\n");
|
||
run_fast = true;
|
||
continue;
|
||
} else if(strcmp(line, "slow") == 0) {
|
||
printf("run 1mhz\n");
|
||
run_fast = false;
|
||
continue;
|
||
} else if(strcmp(line, "banking") == 0) {
|
||
printf("abort on any banking\n");
|
||
exit_on_banking = true;
|
||
continue;
|
||
} else if(strncmp(line, "debug", 5) == 0) {
|
||
sscanf(line + 6, "%d", &debug);
|
||
printf("debug set to %02X\n", debug);
|
||
continue;
|
||
} else if(strcmp(line, "reset") == 0) {
|
||
printf("machine reset.\n");
|
||
bus.reset();
|
||
cpu.reset(bus);
|
||
continue;
|
||
} else if(strcmp(line, "reboot") == 0) {
|
||
printf("CPU rebooted (NMI).\n");
|
||
bus.reset();
|
||
cpu.nmi(bus);
|
||
continue;
|
||
}
|
||
if(debug & DEBUG_DECODE) {
|
||
string dis = read_bus_and_disassemble(bus, use_fake6502 ? pc : cpu.pc);
|
||
printf("%s\n", dis.c_str());
|
||
}
|
||
|
||
if(use_fake6502) {
|
||
clockticks6502 = 0;
|
||
step6502();
|
||
clk.add_cpu_cycles(clockticks6502);
|
||
} else {
|
||
cpu.cycle(bus);
|
||
}
|
||
mainboard->sync();
|
||
|
||
APPLE2Einterface::iterate(mode_history, clk.clock_cpu);
|
||
mode_history.clear();
|
||
}
|
||
}
|
||
|
||
APPLE2Einterface::shutdown();
|
||
}
|
||
|
||
int hires_visible_address_base[262] =
|
||
{
|
||
0x0000, 0x0400, 0x0800, 0x0C00, 0x1000, 0x1400, 0x1800, 0x1C00,
|
||
0x0080, 0x0480, 0x0880, 0x0C80, 0x1080, 0x1480, 0x1880, 0x1C80,
|
||
0x0100, 0x0500, 0x0900, 0x0D00, 0x1100, 0x1500, 0x1900, 0x1D00,
|
||
0x0180, 0x0580, 0x0980, 0x0D80, 0x1180, 0x1580, 0x1980, 0x1D80,
|
||
0x0200, 0x0600, 0x0A00, 0x0E00, 0x1200, 0x1600, 0x1A00, 0x1E00,
|
||
0x0280, 0x0680, 0x0A80, 0x0E80, 0x1280, 0x1680, 0x1A80, 0x1E80,
|
||
0x0300, 0x0700, 0x0B00, 0x0F00, 0x1300, 0x1700, 0x1B00, 0x1F00,
|
||
0x0380, 0x0780, 0x0B80, 0x0F80, 0x1380, 0x1780, 0x1B80, 0x1F80,
|
||
|
||
0x0028, 0x0428, 0x0828, 0x0C28, 0x1028, 0x1428, 0x1828, 0x1C28,
|
||
0x00A8, 0x04A8, 0x08A8, 0x0CA8, 0x10A8, 0x14A8, 0x18A8, 0x1CA8,
|
||
0x0128, 0x0528, 0x0928, 0x0D28, 0x1128, 0x1528, 0x1928, 0x1D28,
|
||
0x01A8, 0x05A8, 0x09A8, 0x0DA8, 0x11A8, 0x15A8, 0x19A8, 0x1DA8,
|
||
0x0228, 0x0628, 0x0A28, 0x0E28, 0x1228, 0x1628, 0x1A28, 0x1E28,
|
||
0x02A8, 0x06A8, 0x0AA8, 0x0EA8, 0x12A8, 0x16A8, 0x1AA8, 0x1EA8,
|
||
0x0328, 0x0728, 0x0B28, 0x0F28, 0x1328, 0x1728, 0x1B28, 0x1F28,
|
||
0x03A8, 0x07A8, 0x0BA8, 0x0FA8, 0x13A8, 0x17A8, 0x1BA8, 0x1FA8,
|
||
|
||
0x0050, 0x0450, 0x0850, 0x0C50, 0x1050, 0x1450, 0x1850, 0x1C50,
|
||
0x00D0, 0x04D0, 0x08D0, 0x0CD0, 0x10D0, 0x14D0, 0x18D0, 0x1CD0,
|
||
0x0150, 0x0550, 0x0950, 0x0D50, 0x1150, 0x1550, 0x1950, 0x1D50,
|
||
0x01D0, 0x05D0, 0x09D0, 0x0DD0, 0x11D0, 0x15D0, 0x19D0, 0x1DD0,
|
||
0x0250, 0x0650, 0x0A50, 0x0E50, 0x1250, 0x1650, 0x1A50, 0x1E50,
|
||
0x02D0, 0x06D0, 0x0AD0, 0x0ED0, 0x12D0, 0x16D0, 0x1AD0, 0x1ED0,
|
||
0x0350, 0x0750, 0x0B50, 0x0F50, 0x1350, 0x1750, 0x1B50, 0x1F50,
|
||
0x03D0, 0x07D0, 0x0BD0, 0x0FD0, 0x13D0, 0x17D0, 0x1BD0, 0x1FD0,
|
||
|
||
0x0078, 0x0478, 0x0878, 0x0C78, 0x1078, 0x1478, 0x1878, 0x1C78,
|
||
0x00F8, 0x04F8, 0x08F8, 0x0CF8, 0x10F8, 0x14F8, 0x18F8, 0x1CF8,
|
||
0x0178, 0x0578, 0x0978, 0x0D78, 0x1178, 0x1578, 0x1978, 0x1D78,
|
||
0x01F8, 0x05F8, 0x09F8, 0x0DF8, 0x11F8, 0x15F8, 0x19F8, 0x1DF8,
|
||
0x0278, 0x0678, 0x0A78, 0x0E78, 0x1278, 0x1678, 0x1A78, 0x1E78,
|
||
0x02F8, 0x06F8, 0x0AF8, 0x0EF8, 0x12F8, 0x16F8, 0x1AF8, 0x1EF8,
|
||
0x0378, 0x0778, 0x0B78, 0x0F78, 0x1378, 0x1778, 0x1B78, 0x1F78,
|
||
0x03F8, 0x07F8, 0x0BF8, 0x0FF8, 0x13F8, 0x17F8, 0x1BF8, 0x1FF8,
|
||
0x0BF8, 0x0FF8, 0x13F8, 0x17F8, 0x1BF8, 0x1FF8,
|
||
};
|