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https://github.com/bradgrantham/apple2e.git
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Incomplete Apple //e emulator
This commit is contained in:
Brad Grantham
parent
9ddb1c80d7
commit
033509b566
587
apple2e.cpp
Normal file
587
apple2e.cpp
Normal file
@ -0,0 +1,587 @@
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#include <cstdlib>
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#include "emulator.h"
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const unsigned int DEBUG_RW = 0x01;
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const unsigned int DEBUG_DECODE = 0x02;
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const unsigned int DEBUG_STATE = 0x04;
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const unsigned int DEBUG_ERROR = 0x08;
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unsigned int debug = DEBUG_ERROR | DEBUG_DECODE | DEBUG_STATE;
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struct MAINboard : board_base
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{
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static const int text1_base = 0x400;
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static const int text1_size = 0x3FF;
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static const int text2_base = 0x800;
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static const int text2_size = 0xBFF;
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static const int io_base = 0xC000;
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static const int io_size = 0x0100;
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static const int irom_base = 0xC100;
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static const int irom_size = 0x0F00;
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static const int rom_base = 0xD000;
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static const int rom_size = 0x3000;
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unsigned char rom_bytes[rom_size];
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unsigned char irom_bytes[irom_size];
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unsigned char ram_bytes[65536];
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bool ROM_is_active;
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bool CXROM_is_active;
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MAINboard(unsigned char rom[32768]) :
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ROM_is_active(true),
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CXROM_is_active(true)
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{
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memcpy(rom_bytes, rom + rom_base - 0x8000 , sizeof(rom_bytes));
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memcpy(irom_bytes, rom + irom_base - 0x8000 , sizeof(irom_bytes));
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memset(ram_bytes, 0x76, sizeof(ram_bytes));
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}
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static const int RDCXROM = 0xC015;
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static const int SETINTCXROM = 0xC007;
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static const int TXTSET = 0xC051;
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static const int TXTPAGE1 = 0xC054;
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static const int LORES = 0xC056;
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virtual bool read(int addr, unsigned char &data)
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{
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if(debug & DEBUG_RW) printf("MAIN board read\n");
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if(addr >= io_base && addr < io_base + io_size) {
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switch(addr) {
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case RDCXROM:
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printf("RD CXROM\n");
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data = CXROM_is_active ? 0x80 : 0x00;
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return true;
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break;
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case TXTSET:
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printf("RD TXTSET\n");
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break;
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case TXTPAGE1:
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printf("RD TXTPAGE1\n");
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break;
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case LORES:
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printf("RD LORES\n");
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break;
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default:
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printf("unhandled MMIO RD %04X\n", addr);
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exit(0);
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break;
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}
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}
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if(ROM_is_active && addr >= irom_base && addr < irom_base + sizeof(irom_bytes)) {
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data = irom_bytes[addr - irom_base];
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if(debug & DEBUG_RW) printf("read 0x%04X -> 0x%02X from internal ROM\n", addr, data);
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return true;
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}
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if(ROM_is_active && addr >= rom_base && addr < rom_base + sizeof(rom_bytes)) {
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data = rom_bytes[addr - rom_base];
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if(debug & DEBUG_RW) printf("read 0x%04X -> 0x%02X from ROM\n", addr, data);
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return true;
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}
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if(addr >= 0 && addr < sizeof(ram_bytes)) {
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data = ram_bytes[addr];
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if(debug & DEBUG_RW) printf("read 0x%04X -> 0x%02X from RAM\n", addr, 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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virtual bool write(int addr, unsigned char data)
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{
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if(addr >= text1_base && addr < text1_base + text1_size) {
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printf("TEXT1 WRITE!\n");
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exit(0);
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}
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if(addr >= text2_base && addr < text2_base + text2_size) {
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printf("TEXT2 WRITE!\n");
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exit(0);
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}
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if(addr >= io_base && addr < io_base + io_size) {
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switch(addr) {
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case SETINTCXROM:
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printf("WR SETINTCXROM\n");
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CXROM_is_active = true;
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case TXTSET:
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printf("WR TXTSET\n");
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break;
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case TXTPAGE1:
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printf("WR TXTPAGE1\n");
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break;
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case LORES:
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printf("WR LORES\n");
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break;
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default:
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printf("unhandled MMIO %04X write\n", addr);
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exit(0);
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}
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}
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if(ROM_is_active && addr >= rom_base && addr < rom_base + sizeof(rom_bytes)) {
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return false;
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}
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if(ROM_is_active && addr >= irom_base && addr < irom_base + sizeof(irom_bytes)) {
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return false;
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}
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if(addr >= 0 && addr < sizeof(ram_bytes)) {
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ram_bytes[addr] = data;
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if(debug & DEBUG_RW) printf("wrote 0x%02X to RAM 0x%04X\n", data, addr);
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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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struct bus_controller
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{
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std::vector<board_base*> boards;
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unsigned char read(int addr)
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{
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for(auto b = boards.begin(); b != boards.end(); b++) {
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unsigned char data = 0xaa;
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if((*b)->read(addr, data))
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return data;
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}
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if(debug & DEBUG_ERROR)
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fprintf(stderr, "no ownership of read at %04X\n", addr);
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return 0xAA;
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}
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void write(int addr, unsigned char data)
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{
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for(auto b = boards.begin(); b != boards.end(); b++) {
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if((*b)->write(addr, data))
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return;
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}
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if(debug & DEBUG_ERROR)
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fprintf(stderr, "no ownership of write %02X at %04X\n", data, addr);
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}
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};
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bus_controller bus;
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struct CPU6502
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{
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unsigned char a, x, y, s, p;
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static const unsigned char N = 0x80;
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static const unsigned char V = 0x40;
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static const unsigned char B = 0x10;
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static const unsigned char D = 0x08;
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static const unsigned char I = 0x04;
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static const unsigned char Z = 0x02;
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static const unsigned char C = 0x01;
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int pc;
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enum Exception {
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NONE,
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RESET,
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NMI,
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BRK,
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INT,
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} exception;
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CPU6502() :
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exception(RESET)
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{
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}
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void stack_push(bus_controller& bus, unsigned char d)
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{
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bus.write(0x100 + s--, d);
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}
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unsigned char stack_pull(bus_controller& bus)
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{
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return bus.read(0x100 + ++s);
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}
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unsigned char read_pc_inc(bus_controller& bus)
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{
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return bus.read(pc++);
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}
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void flag_change(unsigned char flag, bool v)
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{
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if(v)
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p |= flag;
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else
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p &= ~flag;
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}
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void flag_set(unsigned char flag)
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{
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p |= flag;
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}
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void flag_clear(unsigned char flag)
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{
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p &= ~flag;
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}
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void reset(bus_controller& bus)
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{
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s = 0xFD;
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pc = bus.read(0xFFFC) + bus.read(0xFFFD) * 256;
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exception = NONE;
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}
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enum Operand {
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A,
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IMPL,
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REL,
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ABS,
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ABS_X,
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ABS_Y,
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IND,
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X_IND,
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IND_Y,
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ZPG,
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ZPG_X,
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ZPG_Y,
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IMM,
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UND,
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};
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int carry()
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{
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return (p & C) ? 1 : 0;
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}
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bool isset(unsigned char flag)
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{
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return (p & flag) != 0;
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}
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#if 0
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int get_operand(bus_controller& bus, Operand oper)
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{
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switch(oper)
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{
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case A: return 0;
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case UND: return 0;
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case IMPL: return 0;
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case REL: return (bus.read(pc) + 128) % 256 - 128;
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case ABS: return bus.read(pc) + bus.read(pc + 1) * 256;
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case ABS_Y: return bus.read(pc) + bus.read(pc + 1) * 256 + y + carry;
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case ABS_X: return bus.read(pc) + bus.read(pc + 1) * 256 + x + carry;
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case ZPG: return bus.read(pc);
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case ZPG_Y: return (bus.read(pc) + y) & 0xFF;
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case ZPG_X: return (bus.read(pc) + x) & 0xFF;
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case IND: return bus.read(bus.read(pc) + bus.read(pc + 1) * 256);
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}
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}
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#endif
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void cycle(bus_controller& bus)
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{
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if(exception == RESET) {
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if(debug & DEBUG_STATE) printf("RESET\n");
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reset(bus);
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}
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unsigned char inst = read_pc_inc(bus);
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switch(inst) {
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case 0xD8: {
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if(debug & DEBUG_DECODE) printf("CLD\n");
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flag_clear(D);
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break;
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}
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case 0xCE: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("DEC %02X, Y\n", addr);
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unsigned char m = bus.read(addr) - 1;
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flag_change(Z, m == 0);
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flag_change(N, m & 0x80);
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bus.write(addr, m);
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break;
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}
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case 0x30: {
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int rel = (read_pc_inc(bus) + 128) % 256 - 128;
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if(debug & DEBUG_DECODE) printf("BMI %02X\n", rel);
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if(isset(N))
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pc += rel;
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break;
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}
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case 0xB9: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("LDA %02X, Y\n", addr);
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a = bus.read(addr + y);
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flag_change(Z, a == 0x00);
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flag_change(N, a & 0x80);
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break;
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}
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case 0x69: {
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unsigned char imm = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("ADC %02X\n", imm);
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int carry = isset(C) ? 1 : 0;
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flag_change(C, (int)(a + imm + carry) > 0xFF);
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a = a + imm + carry;
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flag_change(N, a & 0x80);
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flag_change(V, isset(C) != isset(N));
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flag_change(Z, a == 0);
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break;
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}
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case 0x4A: {
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if(debug & DEBUG_DECODE) printf("LSR\n");
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flag_change(C, a & 0x01);
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a = a >> 1;
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flag_change(N, a & 0x80);
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flag_change(Z, a == 0);
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break;
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}
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case 0x68: {
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if(debug & DEBUG_DECODE) printf("PLA\n");
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a = stack_pull(bus);
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flag_change(Z, a == 0x00);
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flag_change(N, a & 0x80);
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break;
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}
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case 0x48: {
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if(debug & DEBUG_DECODE) printf("PHA\n");
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stack_push(bus, a);
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break;
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}
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case 0x09: {
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unsigned char imm = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("OR %02X\n", imm);
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a = a | imm;
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flag_change(Z, a == 0x00);
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flag_change(N, a & 0x80);
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break;
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}
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case 0x29: {
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unsigned char imm = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("AND %02X\n", imm);
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a = a & imm;
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flag_change(Z, a == 0x00);
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flag_change(N, a & 0x80);
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break;
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}
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case 0x88: {
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if(debug & DEBUG_DECODE) printf("DEY\n");
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y = y - 1;
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flag_change(Z, y == 0x00);
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flag_change(N, y & 0x80);
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break;
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}
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case 0x76: {
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unsigned char zpg = read_pc_inc(bus) + x;
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if(debug & DEBUG_DECODE) printf("ROR %02X\n", zpg);
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unsigned char m = bus.read(zpg);
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bool c = isset(C);
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flag_change(C, m & 0x01);
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m = (c ? 0x80 : 0x00) | (m >> 1);
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flag_change(N, m & 0x80);
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flag_change(Z, m == 0);
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bus.write(zpg, m);
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break;
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}
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case 0x4C: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("JMP %04X\n", addr);
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pc = addr;
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break;
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}
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case 0x8D: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("STA %04X\n", addr);
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bus.write(addr, a);
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break;
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}
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case 0x08: {
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if(debug & DEBUG_DECODE) printf("PHP\n");
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stack_push(bus, p);
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break;
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}
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case 0x2C: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("BIT #%04X\n", addr);
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unsigned char m = bus.read(addr);
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flag_change(Z, a & m);
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flag_change(N, m & 0x80);
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flag_change(V, m & 0x70);
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break;
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}
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case 0xA0: {
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unsigned char imm = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("LDY #%02X\n", imm);
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y = imm;
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flag_change(N, y & 0x80);
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flag_change(Z, y == 0);
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break;
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}
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case 0xA9: {
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unsigned char imm = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("LDA #%02X\n", imm);
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a = imm;
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flag_change(N, a & 0x80);
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flag_change(Z, a == 0);
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break;
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}
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case 0xAD: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("LDA %04X\n", addr);
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a = bus.read(addr);
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flag_change(N, a & 0x80);
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flag_change(Z, a == 0);
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break;
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}
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case 0xD5: {
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unsigned char zpg = read_pc_inc(bus) + x;
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if(debug & DEBUG_DECODE) printf("CMP %02X\n", zpg);
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unsigned char m = bus.read(zpg);
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flag_change(N, m < a);
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m = a - m;
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flag_change(N, m & 0x80);
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flag_change(Z, m == 0);
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break;
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}
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case 0x90: {
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int rel = (read_pc_inc(bus) + 128) % 256 - 128;
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if(debug & DEBUG_DECODE) printf("BCC %02X\n", rel);
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if(!isset(C))
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pc += rel;
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break;
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}
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case 0xB0: {
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int rel = (read_pc_inc(bus) + 128) % 256 - 128;
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if(debug & DEBUG_DECODE) printf("BCS %02X\n", rel);
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if(isset(C))
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pc += rel;
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break;
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}
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case 0xD0: {
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int rel = (read_pc_inc(bus) + 128) % 256 - 128;
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if(debug & DEBUG_DECODE) printf("BNE %02X\n", rel);
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if(!isset(Z))
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pc += rel;
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break;
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}
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case 0xF0: {
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int rel = (read_pc_inc(bus) + 128) % 256 - 128;
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if(debug & DEBUG_DECODE) printf("BEQ %02X\n", rel);
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if(isset(Z))
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pc += rel;
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break;
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}
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case 0x85: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("STA %02X\n", zpg);
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bus.write(zpg, a);
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break;
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}
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case 0x60: {
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if(debug & DEBUG_DECODE) printf("RTS\n");
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unsigned char pcl = stack_pull(bus);
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unsigned char pch = stack_pull(bus);
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pc = pcl + pch * 256;
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break;
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}
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case 0x84: {
|
||||
unsigned char zpg = read_pc_inc(bus);
|
||||
if(debug & DEBUG_DECODE) printf("STY %02X\n", zpg);
|
||||
bus.write(zpg, y);
|
||||
break;
|
||||
}
|
||||
|
||||
case 0x20: {
|
||||
stack_push(bus, (pc + 2) >> 8);
|
||||
stack_push(bus, (pc + 2) & 0xFF);
|
||||
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
|
||||
if(debug & DEBUG_DECODE) printf("JSR %04X\n", addr);
|
||||
pc = addr;
|
||||
break;
|
||||
}
|
||||
|
||||
default:
|
||||
printf("unhandled instruction %02X\n", inst);
|
||||
exit(1);
|
||||
}
|
||||
if(debug & DEBUG_STATE) {
|
||||
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 PC:%04X (%02X %02X %02X)\n", s, pc, pc0, pc1, pc2);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
void usage(char *progname)
|
||||
{
|
||||
printf("\n");
|
||||
printf("usage: %s ROM.bin\n", progname);
|
||||
printf("\n");
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
char *progname = argv[0];
|
||||
argc -= 1;
|
||||
argv += 1;
|
||||
|
||||
while((argc > 0) && (argv[0][0] == '-')) {
|
||||
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];
|
||||
|
||||
FILE *fp = fopen(romname, "rb");
|
||||
if(fp == NULL) {
|
||||
fprintf(stderr, "failed to open %s for reading\n", romname);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
size_t length = fread(b, 1, sizeof(b), fp);
|
||||
if(length < MAINboard::rom_size) {
|
||||
fprintf(stderr, "ROM read from %s was unexpectedly short (%zd bytes)\n", romname, length);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
fclose(fp);
|
||||
|
||||
bus.boards.push_back(new MAINboard(b));
|
||||
|
||||
for(auto b = bus.boards.begin(); b != bus.boards.end(); b++) {
|
||||
(*b)->reset();
|
||||
}
|
||||
|
||||
CPU6502 cpu;
|
||||
|
||||
while(1) {
|
||||
cpu.cycle(bus);
|
||||
printf("> ");
|
||||
char line[512];
|
||||
fgets(line, sizeof(line) - 1, stdin);
|
||||
}
|
||||
}
|
||||
21
emulator.h
Normal file
21
emulator.h
Normal file
@ -0,0 +1,21 @@
|
||||
#ifndef _SIMULATOR_H_
|
||||
#define _SIMULATOR_H_
|
||||
|
||||
#include <vector>
|
||||
#undef max
|
||||
|
||||
struct board_base
|
||||
{
|
||||
virtual bool write(int addr, unsigned char data) { return false; }
|
||||
virtual bool read(int addr, unsigned char &data) { return false; }
|
||||
virtual bool board_get_interrupt(int& irq) { return false; }
|
||||
|
||||
virtual void reset(void) {}
|
||||
virtual void idle(void) {};
|
||||
virtual void pause(void) {};
|
||||
virtual void resume(void) {};
|
||||
};
|
||||
|
||||
extern std::vector<board_base*> boards;
|
||||
|
||||
#endif /* _SIMULATOR_H_ */
|
||||
Loading…
Reference in New Issue
Block a user