1853 lines
43 KiB
C++
1853 lines
43 KiB
C++
//
|
|
// Apple 2 SDL Portable Apple Emulator
|
|
//
|
|
// by James Hammons
|
|
// (C) 2005 Underground Software
|
|
//
|
|
// Loosely based on AppleWin by Tom Charlesworth which was based on AppleWin by
|
|
// Oliver Schmidt which was based on AppleWin by Michael O'Brien. :-) Parts are
|
|
// also derived from ApplePC. Too bad it was closed source--it could have been
|
|
// *the* premier Apple II emulator out there.
|
|
//
|
|
// JLH = James Hammons <jlhamm@acm.org>
|
|
//
|
|
// WHO WHEN WHAT
|
|
// --- ---------- ------------------------------------------------------------
|
|
// JLH 11/12/2005 Initial port to SDL
|
|
// JLH 11/18/2005 Wired up graphic soft switches
|
|
// JLH 12/02/2005 Setup timer subsystem for more accurate time keeping
|
|
// JLH 12/12/2005 Added preliminary state saving support
|
|
// JLH 09/24/2013 Added //e support
|
|
//
|
|
|
|
// STILL TO DO:
|
|
//
|
|
// - Port to SDL [DONE]
|
|
// - GUI goodies
|
|
// - Weed out unneeded functions [DONE]
|
|
// - Disk I/O [DONE]
|
|
// - 128K IIe related stuff [DONE]
|
|
// - State loading/saving
|
|
//
|
|
|
|
#include "apple2.h"
|
|
|
|
#include <SDL2/SDL.h>
|
|
#include <fstream>
|
|
#include <string>
|
|
#include <iomanip>
|
|
#include <iostream>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include "log.h"
|
|
#include "video.h"
|
|
#include "sound.h"
|
|
#include "settings.h"
|
|
#include "v65c02.h"
|
|
#include "applevideo.h"
|
|
#include "timing.h"
|
|
#include "floppy.h"
|
|
#include "firmware.h"
|
|
#include "mmu.h"
|
|
|
|
#include "gui/gui.h"
|
|
#include "gui/window.h"
|
|
#include "gui/draggablewindow2.h"
|
|
#include "gui/textedit.h"
|
|
|
|
// Debug and misc. defines
|
|
|
|
#define THREADED_65C02
|
|
#define CPU_THREAD_OVERFLOW_COMPENSATION
|
|
#define DEBUG_LC
|
|
//#define CPU_CLOCK_CHECKING
|
|
//#define THREAD_DEBUGGING
|
|
#define SOFT_SWITCH_DEBUGGING
|
|
|
|
// Global variables
|
|
|
|
uint8_t ram[0x10000], rom[0x10000]; // RAM & ROM spaces
|
|
uint8_t ram2[0x10000]; // Auxillary RAM
|
|
//uint8_t diskRom[0x100]; // Disk ROM space
|
|
V65C02REGS mainCPU; // v65C02 execution context
|
|
uint8_t appleType = APPLE_TYPE_IIE;
|
|
FloppyDrive floppyDrive;
|
|
|
|
// Local variables
|
|
|
|
uint8_t lastKeyPressed = 0;
|
|
bool keyDown = false;
|
|
bool openAppleDown = false;
|
|
bool closedAppleDown = false;
|
|
bool store80Mode = false;
|
|
bool vbl = false;
|
|
bool slotCXROM = false;
|
|
bool slotC3ROM = false;
|
|
bool ramrd = false;
|
|
bool ramwrt = false;
|
|
bool altzp = false;
|
|
bool ioudis = true;
|
|
bool dhires = false;
|
|
|
|
//static FloppyDrive floppyDrive;
|
|
|
|
enum { LC_BANK_1, LC_BANK_2 };
|
|
|
|
static uint8_t visibleBank = LC_BANK_1;
|
|
static bool readRAM = false;
|
|
static bool writeRAM = false;
|
|
|
|
static bool running = true; // Machine running state flag...
|
|
static uint32_t startTicks;
|
|
static bool pauseMode = false;
|
|
|
|
static GUI * gui = NULL;
|
|
|
|
// Local functions (technically, they're global...)
|
|
|
|
bool LoadImg(char * filename, uint8_t * ram, int size);
|
|
uint8_t RdMem(uint16_t addr);
|
|
void WrMem(uint16_t addr, uint8_t b);
|
|
static void SaveApple2State(const char * filename);
|
|
static bool LoadApple2State(const char * filename);
|
|
|
|
// Local timer callback functions
|
|
|
|
static void FrameCallback(void);
|
|
static void BlinkTimer(void);
|
|
|
|
#ifdef THREADED_65C02
|
|
// Test of threaded execution of 6502
|
|
static SDL_Thread * cpuThread = NULL;
|
|
//static SDL_mutex * cpuMutex = NULL;
|
|
static SDL_cond * cpuCond = NULL;
|
|
static SDL_sem * mainSem = NULL;
|
|
static bool cpuFinished = false;
|
|
static bool cpuSleep = false;
|
|
|
|
// NB: Apple //e Manual sez 6502 is running @ 1,022,727 Hz
|
|
|
|
// Let's try a thread...
|
|
/*
|
|
Here's how it works: Execute 1 frame's worth, then sleep.
|
|
Other stuff wakes it up
|
|
*/
|
|
int CPUThreadFunc(void * data)
|
|
{
|
|
// Mutex must be locked for conditional to work...
|
|
// Also, must be created in the thread that uses it...
|
|
SDL_mutex * cpuMutex = SDL_CreateMutex();
|
|
|
|
// decrement mainSem...
|
|
//SDL_SemWait(mainSem);
|
|
#ifdef CPU_THREAD_OVERFLOW_COMPENSATION
|
|
float overflow = 0.0;
|
|
#endif
|
|
|
|
do
|
|
{
|
|
if (cpuSleep)
|
|
SDL_CondWait(cpuCond, cpuMutex);
|
|
|
|
// decrement mainSem...
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: SDL_SemWait(mainSem);\n");
|
|
#endif
|
|
SDL_SemWait(mainSem);
|
|
|
|
// There are exactly 800 slices of 21.333 cycles per frame, so it works out
|
|
// evenly.
|
|
#if 0
|
|
uint32_t cycles = 17066;
|
|
#ifdef CPU_THREAD_OVERFLOW_COMPENSATION
|
|
// ODD! It's closer *without* this overflow compensation. ??? WHY ???
|
|
overflow += 0.666666667;
|
|
|
|
if (overflow > 1.0)
|
|
{
|
|
overflow -= 1.0;
|
|
cycles++;
|
|
}
|
|
#endif
|
|
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
|
|
#endif
|
|
Execute65C02(&mainCPU, cycles); // how much? 1 frame (after 1 s, off by 40 cycles) not any more--it's off by as much as 240 now!
|
|
|
|
// Adjust the sound routine's last cycle toggled time base
|
|
// Also, since we're finished executing, .clock is now valid
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: AdjustLastToggleCycles(mainCPU.clock);\n");
|
|
#endif
|
|
AdjustLastToggleCycles(mainCPU.clock);
|
|
#else
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
|
|
#endif
|
|
for(int i=0; i<800; i++)
|
|
{
|
|
uint32_t cycles = 21;
|
|
overflow += 0.333333334;
|
|
|
|
if (overflow > 1.0)
|
|
{
|
|
cycles++;
|
|
overflow -= 1.0;
|
|
}
|
|
|
|
Execute65C02(&mainCPU, cycles);
|
|
WriteSampleToBuffer();
|
|
|
|
// Dunno if this is correct (seems to be close enough)...
|
|
vbl = (i < 670 ? true : false);
|
|
}
|
|
#endif
|
|
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: SDL_mutexP(cpuMutex);\n");
|
|
#endif
|
|
SDL_mutexP(cpuMutex);
|
|
// increment mainSem...
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: SDL_SemPost(mainSem);\n");
|
|
#endif
|
|
SDL_SemPost(mainSem);
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: SDL_CondWait(cpuCond, cpuMutex);\n");
|
|
#endif
|
|
SDL_CondWait(cpuCond, cpuMutex);
|
|
|
|
#ifdef THREAD_DEBUGGING
|
|
WriteLog("CPU: SDL_mutexV(cpuMutex);\n");
|
|
#endif
|
|
SDL_mutexV(cpuMutex);
|
|
}
|
|
while (!cpuFinished);
|
|
|
|
SDL_DestroyMutex(cpuMutex);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
// Test GUI function
|
|
|
|
Element * TestWindow(void)
|
|
{
|
|
Element * win = new DraggableWindow2(10, 10, 128, 128);
|
|
// ((DraggableWindow *)win)->AddElement(new TextEdit(4, 16, 92, 0, "u2prog.dsk", win));
|
|
|
|
return win;
|
|
}
|
|
|
|
|
|
Element * QuitEmulator(void)
|
|
{
|
|
gui->Stop();
|
|
running = false;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
Small Apple II memory map:
|
|
|
|
$C010 - Clear bit 7 of keyboard data ($C000)
|
|
$C030 - Toggle speaker diaphragm
|
|
$C051 - Display text
|
|
$C054 - Select page 1
|
|
$C056 - Select lo-res
|
|
$C058 - Set annuciator-0 output to 0
|
|
$C05A - Set annuciator-0 output to 0
|
|
$C05D - Set annuciator-0 output to 1
|
|
$C05F - Set annuciator-0 output to 1
|
|
$C0E0 - Disk control stepper ($C0E0-7)
|
|
$C0E9 - Disk control motor (on)
|
|
$C0EA - Disk enable (drive 1)
|
|
$C0EC - Disk R/W
|
|
$C0EE - Disk set read mode
|
|
*/
|
|
|
|
//
|
|
// V65C02 read/write memory functions
|
|
//
|
|
|
|
uint8_t RdMem(uint16_t addr)
|
|
{
|
|
uint8_t b;
|
|
|
|
#if 0
|
|
if (addr >= 0xC000 && addr <= 0xC0FF)
|
|
WriteLog("\n*** Read at I/O address %04X\n", addr);
|
|
#endif
|
|
#if 0
|
|
if (addr >= 0xC080 && addr <= 0xC08F)
|
|
WriteLog("\n*** Read at I/O address %04X\n", addr);
|
|
#endif
|
|
|
|
if ((addr & 0xFFF0) == 0xC000) // Read $C000-$C00F
|
|
{
|
|
return lastKeyPressed | (keyDown ? 0x80 : 0x00);
|
|
}
|
|
// else if ((addr & 0xFFF8) == 0xC010) // Read $C010-$C01F
|
|
else if (addr == 0xC010)
|
|
{
|
|
//This is bogus: keyDown is set to false, so return val NEVER is set...
|
|
//Fixed...
|
|
//Also, this is IIe/IIc only...!
|
|
uint8_t retVal = lastKeyPressed | (keyDown ? 0x80 : 0x00);
|
|
keyDown = false;
|
|
return retVal;
|
|
}
|
|
// These are //e locations
|
|
else if (addr == 0xC011)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RDBANK2 (read)\n");
|
|
#endif
|
|
return (visibleBank == LC_BANK_2 ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC012)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RDLCRAM (read)\n");
|
|
#endif
|
|
return (readRAM ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC013)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RAMRD (read)\n");
|
|
#endif
|
|
return (ramrd ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC014)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RAMWRT (read)\n");
|
|
#endif
|
|
return (ramwrt ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC015)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("SLOTCXROM (read)\n");
|
|
#endif
|
|
return (slotCXROM ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC016)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("ALTZP (read)\n");
|
|
#endif
|
|
return (altzp ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC017)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("SLOTC3ROM (read)\n");
|
|
#endif
|
|
return (slotC3ROM ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC018)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("80STORE (read)\n");
|
|
#endif
|
|
return (store80Mode ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC019)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("VBL (read)\n");
|
|
#endif
|
|
// NB: The doco suggests that this signal goes LOW when in the VBI.
|
|
// Which means that we need to control this by counting lines somewhere.
|
|
return (vbl ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC01A)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("TEXT (read)\n");
|
|
#endif
|
|
return (textMode ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC01B)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("MIXED (read)\n");
|
|
#endif
|
|
return (mixedMode ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC01C)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("PAGE2 (read)\n");
|
|
#endif
|
|
return (displayPage2 ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC01D)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("HIRES (read)\n");
|
|
#endif
|
|
return (hiRes ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC01E)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("ALTCHARSET (read)\n");
|
|
#endif
|
|
return (alternateCharset ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC01F)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("80COL (read)\n");
|
|
#endif
|
|
return (col80Mode ? 0x80 : 0x00);
|
|
}
|
|
else if ((addr & 0xFFF0) == 0xC030) // Read $C030-$C03F
|
|
{
|
|
ToggleSpeaker();
|
|
//should it return something else here???
|
|
return 0x00;
|
|
}
|
|
else if (addr == 0xC050) // Read $C050
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("TEXT off (read)\n");
|
|
#endif
|
|
textMode = false;
|
|
}
|
|
else if (addr == 0xC051) // Read $C051
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("TEXT on (read)\n");
|
|
#endif
|
|
textMode = true;
|
|
}
|
|
else if (addr == 0xC052) // Read $C052
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("MIXED off (read)\n");
|
|
#endif
|
|
mixedMode = false;
|
|
}
|
|
else if (addr == 0xC053) // Read $C053
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("MIXED on (read)\n");
|
|
#endif
|
|
mixedMode = true;
|
|
}
|
|
else if (addr == 0xC054) // Read $C054
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("PAGE2 off (read)\n");
|
|
#endif
|
|
displayPage2 = false;
|
|
}
|
|
else if (addr == 0xC055) // Read $C055
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("PAGE2 on (read)\n");
|
|
#endif
|
|
displayPage2 = true;
|
|
}
|
|
else if (addr == 0xC056) // Read $C056
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("HIRES off (read)\n");
|
|
#endif
|
|
hiRes = false;
|
|
}
|
|
else if (addr == 0xC057) // Read $C057
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("HIRES on (read)\n");
|
|
#endif
|
|
hiRes = true;
|
|
}
|
|
else if (addr == 0xC05E)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("DHIRES on (read)\n");
|
|
#endif
|
|
if (ioudis)
|
|
dhires = true;
|
|
}
|
|
else if (addr == 0xC05F)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("DHIRES off (read)\n");
|
|
#endif
|
|
if (ioudis)
|
|
dhires = false;
|
|
}
|
|
else if (addr == 0xC061) // Read $C061
|
|
{
|
|
// Open Apple key (or push button 0)
|
|
return (openAppleDown ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC062) // Read $C062
|
|
{
|
|
// Open Apple key (or push button 0)
|
|
return (closedAppleDown ? 0x80 : 0x00);
|
|
}
|
|
// The way the paddles work is that a strobe is written (or read) to $C070,
|
|
// then software counts down the time that it takes for the paddle outputs
|
|
// to have bit 7 return to 0. If there are no paddles connected, bit 7
|
|
// stays at 1.
|
|
else if (addr == 0xC064) // Paddles 0-3
|
|
{
|
|
return 0xFF;
|
|
}
|
|
else if (addr == 0xC065)
|
|
{
|
|
return 0xFF;
|
|
}
|
|
else if (addr == 0xC066)
|
|
{
|
|
return 0xFF;
|
|
}
|
|
else if (addr == 0xC067)
|
|
{
|
|
return 0xFF;
|
|
}
|
|
else if (addr == 0xC07E)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("IOUDIS (read)\n");
|
|
#endif
|
|
return (ioudis ? 0x80 : 0x00);
|
|
}
|
|
else if (addr == 0xC07F)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("DHIRES (read)\n");
|
|
#endif
|
|
return (dhires ? 0x80 : 0x00);
|
|
}
|
|
|
|
//Note that this is a kludge: The $D000-$DFFF 4K space is shared (since $C000-$CFFF is
|
|
//memory mapped) between TWO banks, and that that $E000-$FFFF RAM space is a single bank.
|
|
//[SHOULD BE FIXED NOW]
|
|
//OK! This switch selects bank 2 of the 4K bank at $D000-$DFFF. One access makes it
|
|
//visible, two makes it R/W.
|
|
|
|
/*
|
|
301 LDA $E000
|
|
304 PHA
|
|
305 LDA $C081
|
|
308 PLA
|
|
309 PHA
|
|
30A CMP $E000
|
|
30D BNE $332
|
|
30F LDA $C083
|
|
312 LDA $C083
|
|
315 LDA #$A5
|
|
317 STA $D000
|
|
31A CMP $D000
|
|
31D BNE $332
|
|
31F LSR A
|
|
320 STA $D000
|
|
323 CMP $D000
|
|
326 BNE $332
|
|
328 LDA $C081
|
|
32B LDA $C081
|
|
32E LDA #$01
|
|
330 BNE $334
|
|
332 LDA #$00
|
|
334 STA $300
|
|
337 PLA
|
|
338 CMP $E000
|
|
33B BEQ $340
|
|
33D LDA $C080
|
|
340 RTS
|
|
|
|
A = PEEK($C082)
|
|
*/
|
|
|
|
else if ((addr & 0xFFFB) == 0xC080)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C080 49280 OECG R Read RAM bank 2; no write\n");
|
|
#endif
|
|
//$C080 49280 OECG R Read RAM bank 2; no write
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = true;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC081)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C081 49281 OECG RR Read ROM; write RAM bank 2\n");
|
|
#endif
|
|
//$C081 49281 ROMIN OECG RR Read ROM; write RAM bank 2
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = false;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC082)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C082 49282 OECG R Read ROM; no write\n");
|
|
#endif
|
|
//$C082 49282 OECG R Read ROM; no write
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = false;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC083)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C083 49283 OECG RR Read/Write RAM bank 2\n");
|
|
#endif
|
|
//$C083 49283 LCBANK2 OECG RR Read/write RAM bank 2
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = true;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC088)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $%04X 49288 OECG R Read RAM bank 1; no write\n", addr);
|
|
#endif
|
|
//$C088 49288 OECG R Read RAM bank 1; no write
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = true;
|
|
writeRAM = false;
|
|
//Hm. Some stuff seems to want this.
|
|
//nope, was looking at $C0E8... return 0xFF;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC089)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C089 49289 OECG RR Read ROM; write RAM bank 1\n");
|
|
#endif
|
|
//$C089 49289 OECG RR Read ROM; write RAM bank 1
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = false;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC08A)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C08A 49290 OECG R Read ROM; no write\n");
|
|
#endif
|
|
//$C08A 49290 OECG R Read ROM; no write
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = false;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC08B)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C08B 49291 OECG RR Read/Write RAM bank 1\n");
|
|
#endif
|
|
//$C08B 49291 OECG RR Read/write RAM bank 1
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = true;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFF8) == 0xC0E0)
|
|
{
|
|
floppyDrive.ControlStepper(addr & 0x07);
|
|
}
|
|
else if ((addr & 0xFFFE) == 0xC0E8)
|
|
{
|
|
floppyDrive.ControlMotor(addr & 0x01);
|
|
}
|
|
else if ((addr & 0xFFFE) == 0xC0EA)
|
|
{
|
|
floppyDrive.DriveEnable(addr & 0x01);
|
|
}
|
|
else if (addr == 0xC0EC)
|
|
{
|
|
return floppyDrive.ReadWrite();
|
|
}
|
|
else if (addr == 0xC0ED)
|
|
{
|
|
return floppyDrive.GetLatchValue();
|
|
}
|
|
else if (addr == 0xC0EE)
|
|
{
|
|
floppyDrive.SetReadMode();
|
|
}
|
|
else if (addr == 0xC0EF)
|
|
{
|
|
floppyDrive.SetWriteMode();
|
|
}
|
|
|
|
//#define LC_DEBUGGING
|
|
#ifdef LC_DEBUGGING
|
|
bool showpath = false;
|
|
if (addr >= 0xD000 && addr <= 0xD00F)
|
|
showpath = true;
|
|
#endif
|
|
//This sux...
|
|
if (addr >= 0xC100 && addr <= 0xC7FF) // The $C000-$CFFF block is *never* RAM
|
|
{
|
|
// Looks like the ][e ref manual got this one wrong: slotCXROM set should mean
|
|
// use internal ROM, NOT slot ROM. :-/
|
|
// (fixed now, by setting the switch correctly in the write mem section :-P)
|
|
if (!slotCXROM)
|
|
// if (slotCXROM)
|
|
b = rom[addr];
|
|
else
|
|
{
|
|
if (addr >= 0xC100 && addr <= 0xC1FF)
|
|
b = parallelROM[addr & 0xFF];
|
|
else if (addr >= 0xC600 && addr <= 0xC6FF)
|
|
b = diskROM[addr & 0xFF];
|
|
else if (addr >= 0xC300 && addr <= 0xC3FF && !slotC3ROM)
|
|
b = rom[addr];
|
|
else
|
|
b = 0xFF;
|
|
// b = rom[addr];
|
|
}
|
|
#ifdef LC_DEBUGGING
|
|
if (showpath)
|
|
WriteLog("b is from $C100-$CFFF block...\n");
|
|
#endif
|
|
}
|
|
else if (addr >= 0xC800 && addr <= 0xCFFF) // 2K peripheral or OS ROM
|
|
{
|
|
b = rom[addr];
|
|
}
|
|
else if (addr >= 0xD000)
|
|
{
|
|
if (readRAM)
|
|
{
|
|
if (addr <= 0xDFFF && visibleBank == LC_BANK_1)
|
|
#ifdef LC_DEBUGGING
|
|
{
|
|
#endif
|
|
// b = ram[addr - 0x1000];
|
|
b = (altzp ? ram2[addr - 0x1000] : ram[addr - 0x1000]);
|
|
#ifdef LC_DEBUGGING
|
|
if (showpath)
|
|
WriteLog("b is from LC bank #1 (ram[addr - 0x1000])...\n");
|
|
}
|
|
#endif
|
|
else
|
|
#ifdef LC_DEBUGGING
|
|
{
|
|
#endif
|
|
// b = ram[addr];
|
|
b = (altzp ? ram2[addr] : ram[addr]);
|
|
#ifdef LC_DEBUGGING
|
|
if (showpath)
|
|
WriteLog("b is from LC bank #2 (ram[addr])...\n");
|
|
}
|
|
#endif
|
|
}
|
|
else
|
|
#ifdef LC_DEBUGGING
|
|
{
|
|
#endif
|
|
b = rom[addr];
|
|
#ifdef LC_DEBUGGING
|
|
if (showpath)
|
|
WriteLog("b is from LC ROM (rom[addr])...\n");
|
|
}
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
// 80STORE only works for WRITING, not READING!
|
|
#if 0
|
|
// Check for 80STORE mode (STORE80 takes precedence over RAMRD/WRT)...
|
|
if ((((addr >= 0x0400) && (addr <= 0x07FF)) || ((addr >= 0x2000) && (addr <= 0x3FFF))) && store80Mode)
|
|
{
|
|
if (displayPage2)
|
|
b = ram2[addr];
|
|
else
|
|
b = ram[addr];
|
|
|
|
return b;
|
|
}
|
|
#endif
|
|
|
|
// Finally, check for auxillary/altzp write switches
|
|
if (addr < 0x0200)
|
|
b = (altzp ? ram2[addr] : ram[addr]);
|
|
else
|
|
b = (ramrd ? ram2[addr] : ram[addr]);
|
|
#ifdef LC_DEBUGGING
|
|
if (showpath)
|
|
WriteLog("b is from ram[addr]...\n");
|
|
#endif
|
|
}
|
|
|
|
#ifdef LC_DEBUGGING
|
|
if (addr >= 0xD000 && addr <= 0xD00F)
|
|
{
|
|
WriteLog("*** Read from $%04X: $%02X (readRAM=%s, PC=%04X, ram$D000=%02X)\n", addr, b, (readRAM ? "T" : "F"), mainCPU.pc, ram[0xC000]);
|
|
}
|
|
#endif
|
|
|
|
return b;
|
|
}
|
|
|
|
/*
|
|
A-9 (Mockingboard)
|
|
APPENDIX F Assembly Language Program Listings
|
|
|
|
1 *PRIMARY ROUTINES
|
|
2 *FOR SLOT 4
|
|
3 *
|
|
4 ORG $9000
|
|
5 * ;ADDRESSES FOR FIRST 6522
|
|
6 ORB EQU $C400 ;PORT B
|
|
7 ORA EQU $C401 ;PORT A
|
|
8 DDRB EQU $C402 ;DATA DIRECTION REGISTER (A)
|
|
9 DDRA EQU $C403 ;DATA DIRECTION REGISTER (B)
|
|
10 * ;ADDRESSES FOR SECOND 6522
|
|
11 ORB2 EQU $C480 ;PORT B
|
|
12 ORA2 EQU $C481 ;PORT A
|
|
13 DDRB2 EQU $C482 ;DATA DIRECTION REGISTER (B)
|
|
14 DDRA2 EQU $C483 ;DATA DIRECTION REGISTER (A)
|
|
*/
|
|
void WrMem(uint16_t addr, uint8_t b)
|
|
{
|
|
//temp...
|
|
//extern V6809REGS regs;
|
|
//if (addr >= 0xC800 && addr <= 0xCBFE)
|
|
//if (addr == 0xC80F || addr == 0xC80D)
|
|
// WriteLog("WrMem: Writing address %04X with %02X [PC=%04X, $CB00=%02X]\n", addr, b, regs.pc, gram[0xCB00]);//*/
|
|
|
|
#if 0
|
|
if (addr >= 0xC000 && addr <= 0xC0FF)
|
|
WriteLog("\n*** Write at I/O address %04X\n", addr);
|
|
#endif
|
|
/*
|
|
Check the BIKO version on Asimov to see if it's been cracked or not...
|
|
|
|
7F3D: 29 07 AND #$07 [PC=7F3F, SP=01EA, CC=---B-I--, A=01, X=4B, Y=00]
|
|
7F3F: C9 06 CMP #$06 [PC=7F41, SP=01EA, CC=N--B-I--, A=01, X=4B, Y=00]
|
|
7F41: 90 03 BCC $7F46 [PC=7F46, SP=01EA, CC=N--B-I--, A=01, X=4B, Y=00]
|
|
[7F43: 4C 83 7E JMP $7E83] <- Skipped over... (Prints "THANK YOU VERY MUCH!")
|
|
7F46: AA TAX [PC=7F47, SP=01EA, CC=---B-I--, A=01, X=01, Y=00]
|
|
|
|
; INX here *ensures* 1 - 6!!! BUG!!!
|
|
; Or is it? Could this be part of a braindead copy protection scheme? It's
|
|
; awfully close to NOP ($EA)...
|
|
; Nothing else touches it once it's been written... Hmm...
|
|
|
|
7F47: E8 INX [PC=7F48, SP=01EA, CC=---B-I--, A=01, X=02, Y=00]
|
|
7F48: F8 SED [PC=7F49, SP=01EA, CC=---BDI--, A=01, X=02, Y=00]
|
|
7F49: 18 CLC [PC=7F4A, SP=01EA, CC=---BDI--, A=01, X=02, Y=00]
|
|
7F4A: BD 15 4E LDA $4E15,X [PC=7F4D, SP=01EA, CC=---BDI--, A=15, X=02, Y=00]
|
|
|
|
; 4E13: 03 00
|
|
; 4E15: 25 25 15 15 10 20
|
|
; 4E1B: 03 41 99 99 01 00 12
|
|
; 4E22: 99 70
|
|
|
|
7F4D: 65 FC ADC $FC [PC=7F4F, SP=01EA, CC=---BDI--, A=16, X=02, Y=00]
|
|
7F4F: 65 FC ADC $FC [PC=7F51, SP=01EA, CC=---BDI--, A=17, X=02, Y=00]
|
|
7F51: 65 FC ADC $FC [PC=7F53, SP=01EA, CC=---BDI--, A=18, X=02, Y=00]
|
|
7F53: 65 FC ADC $FC [PC=7F55, SP=01EA, CC=---BDI--, A=19, X=02, Y=00]
|
|
|
|
; NO checking is done on the raised stat! Aarrrgggghhhhh!
|
|
|
|
7F55: 9D 15 4E STA $4E15,X [PC=7F58, SP=01EA, CC=---BDI--, A=19, X=02, Y=00]
|
|
7F58: D8 CLD [PC=7F59, SP=01EA, CC=---B-I--, A=19, X=02, Y=00]
|
|
|
|
; Print "ALAKAZAM!" and so on...
|
|
|
|
7F59: 20 2C 40 JSR $402C [PC=402C, SP=01E8, CC=---B-I--, A=19, X=02, Y=00]
|
|
*/
|
|
#if 0
|
|
if (addr == 0x7F47)
|
|
WriteLog("\n*** Byte %02X written at address %04X\n", b, addr);
|
|
#endif
|
|
/*
|
|
I think this is IIc/IIe only...
|
|
|
|
CLR80STORE=$C000 ;80STORE Off- disable 80-column memory mapping (Write)
|
|
SET80STORE=$C001 ;80STORE On- enable 80-column memory mapping (WR-only)
|
|
|
|
CLRAUXRD = $C002 ;read from main 48K (WR-only)
|
|
SETAUXRD = $C003 ;read from aux/alt 48K (WR-only)
|
|
|
|
CLRAUXWR = $C004 ;write to main 48K (WR-only)
|
|
SETAUXWR = $C005 ;write to aux/alt 48K (WR-only)
|
|
|
|
CLRCXROM = $C006 ;use ROM on cards (WR-only)
|
|
SETCXROM = $C007 ;use internal ROM (WR-only)
|
|
|
|
CLRAUXZP = $C008 ;use main zero page, stack, & LC (WR-only)
|
|
SETAUXZP = $C009 ;use alt zero page, stack, & LC (WR-only)
|
|
|
|
CLRC3ROM = $C00A ;use internal Slot 3 ROM (WR-only)
|
|
SETC3ROM = $C00B ;use external Slot 3 ROM (WR-only)
|
|
|
|
CLR80VID = $C00C ;disable 80-column display mode (WR-only)
|
|
SET80VID = $C00D ;enable 80-column display mode (WR-only)
|
|
|
|
CLRALTCH = $C00E ;use main char set- norm LC, Flash UC (WR-only)
|
|
SETALTCH = $C00F ;use alt char set- norm inverse, LC; no Flash (WR-only)
|
|
*/
|
|
if (addr == 0xC000)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("80STORE off (write)\n");
|
|
#endif
|
|
store80Mode = false;
|
|
}
|
|
else if (addr == 0xC001)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("80STORE on (write)\n");
|
|
#endif
|
|
store80Mode = true;
|
|
}
|
|
else if (addr == 0xC002)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RAMRD off (write)\n");
|
|
#endif
|
|
ramrd = false;
|
|
}
|
|
else if (addr == 0xC003)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RAMRD on (write)\n");
|
|
#endif
|
|
ramrd = true;
|
|
}
|
|
else if (addr == 0xC004)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RAMWRT off (write)\n");
|
|
#endif
|
|
ramwrt = false;
|
|
}
|
|
else if (addr == 0xC005)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("RAMWRT on (write)\n");
|
|
#endif
|
|
ramwrt = true;
|
|
}
|
|
else if (addr == 0xC006)
|
|
{
|
|
// This is the only soft switch that breaks the usual convention.
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("SLOTCXROM on (write)\n");
|
|
#endif
|
|
slotCXROM = true;
|
|
}
|
|
else if (addr == 0xC007)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("SLOTCXROM off (write)\n");
|
|
#endif
|
|
slotCXROM = false;
|
|
}
|
|
else if (addr == 0xC008)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("ALTZP off (write)\n");
|
|
#endif
|
|
altzp = false;
|
|
}
|
|
else if (addr == 0xC009)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("ALTZP on (write)\n");
|
|
#endif
|
|
altzp = true;
|
|
}
|
|
else if (addr == 0xC00A)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("SLOTC3ROM off (write)\n");
|
|
#endif
|
|
slotC3ROM = false;
|
|
}
|
|
else if (addr == 0xC00B)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("SLOTC3ROM on (write)\n");
|
|
#endif
|
|
slotC3ROM = true;
|
|
}
|
|
else if (addr == 0xC00C)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("80COL off (write)\n");
|
|
#endif
|
|
col80Mode = false;
|
|
}
|
|
else if (addr == 0xC00D)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("80COL on (write)\n");
|
|
#endif
|
|
col80Mode = true;
|
|
}
|
|
else if (addr == 0xC00E)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("ALTCHARSET off (write)\n");
|
|
#endif
|
|
alternateCharset = false;
|
|
}
|
|
else if (addr == 0xC00F)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("ALTCHARSET on (write)\n");
|
|
#endif
|
|
alternateCharset = true;
|
|
}
|
|
else if ((addr & 0xFFF0) == 0xC010) // Keyboard strobe
|
|
{
|
|
//Actually, according to the A2 ref, this should do nothing since a write
|
|
//is immediately preceded by a read leaving it in the same state it was...
|
|
//But leaving this out seems to fuck up the key handling of some games...
|
|
keyDown = false;
|
|
}
|
|
else if ((addr & 0xFFF0) == 0xC030) // Read $C030-$C03F
|
|
{
|
|
//Likewise, the speaker is supposed to do nothing if you write to it, and
|
|
//for the same reason. But without this, you get no sound in David's
|
|
//Midnight Magic...
|
|
ToggleSpeaker();
|
|
}
|
|
else if (addr == 0xC050)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("TEXT off (write)\n");
|
|
#endif
|
|
textMode = false;
|
|
}
|
|
else if (addr == 0xC051)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("TEXT on (write)\n");
|
|
#endif
|
|
textMode = true;
|
|
}
|
|
else if (addr == 0xC052)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("MIXED off (write)\n");
|
|
#endif
|
|
mixedMode = false;
|
|
}
|
|
else if (addr == 0xC053)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("MIXED on (write)\n");
|
|
#endif
|
|
mixedMode = true;
|
|
}
|
|
else if (addr == 0xC054)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("PAGE2 off (write)\n");
|
|
#endif
|
|
displayPage2 = false;
|
|
}
|
|
else if (addr == 0xC055)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("PAGE2 on (write)\n");
|
|
#endif
|
|
displayPage2 = true;
|
|
}
|
|
else if (addr == 0xC056)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("HIRES off (write)\n");
|
|
#endif
|
|
hiRes = false;
|
|
}
|
|
else if (addr == 0xC057)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("HIRES on (write)\n");
|
|
#endif
|
|
hiRes = true;
|
|
}
|
|
else if (addr == 0xC05E)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("DHIRES on (write)\n");
|
|
#endif
|
|
if (ioudis)
|
|
dhires = true;
|
|
|
|
//static int goDumpDis = 0;
|
|
//goDumpDis++;
|
|
//if (goDumpDis == 2)
|
|
// dumpDis = true;
|
|
}
|
|
else if (addr == 0xC05F)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("DHIRES off (write)\n");
|
|
#endif
|
|
if (ioudis)
|
|
dhires = false;
|
|
}
|
|
else if (addr == 0xC07E)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("IOUDIS on (write)\n");
|
|
#endif
|
|
ioudis = true;
|
|
}
|
|
else if (addr == 0xC07F)
|
|
{
|
|
#ifdef SOFT_SWITCH_DEBUGGING
|
|
WriteLog("IOUDIS off (write)\n");
|
|
#endif
|
|
ioudis = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC080)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C080 49280 OECG R Read RAM bank 2; no write\n");
|
|
#endif
|
|
//$C080 49280 OECG R Read RAM bank 2; no write
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = true;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC081)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C081 49281 OECG RR Read ROM; write RAM bank 2\n");
|
|
#endif
|
|
//$C081 49281 ROMIN OECG RR Read ROM; write RAM bank 2
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = false;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC082)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C082 49282 OECG R Read ROM; no write\n");
|
|
#endif
|
|
//$C082 49282 OECG R Read ROM; no write
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = false;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC083)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C083 49283 OECG RR Read/Write RAM bank 2\n");
|
|
#endif
|
|
//$C083 49283 LCBANK2 OECG RR Read/write RAM bank 2
|
|
visibleBank = LC_BANK_2;
|
|
readRAM = true;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC088)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C088 49288 OECG R Read RAM bank 1; no write\n");
|
|
#endif
|
|
//$C088 49288 OECG R Read RAM bank 1; no write
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = true;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC089)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C089 49289 OECG RR Read ROM; write RAM bank 1\n");
|
|
#endif
|
|
//$C089 49289 OECG RR Read ROM; write RAM bank 1
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = false;
|
|
writeRAM = true;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC08A)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C08A 49290 OECG R Read ROM; no write\n");
|
|
#endif
|
|
//$C08A 49290 OECG R Read ROM; no write
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = false;
|
|
writeRAM = false;
|
|
}
|
|
else if ((addr & 0xFFFB) == 0xC08B)
|
|
{
|
|
#ifdef DEBUG_LC
|
|
WriteLog("LC(R): $C08B 49291 OECG RR Read/Write RAM bank 1\n");
|
|
#endif
|
|
//$C08B 49291 OECG RR Read/write RAM bank 1
|
|
visibleBank = LC_BANK_1;
|
|
readRAM = true;
|
|
writeRAM = true;
|
|
}
|
|
//This is determined by which slot it is in--this assumes slot 6. !!! FIX !!!
|
|
else if ((addr & 0xFFF8) == 0xC0E0)
|
|
{
|
|
floppyDrive.ControlStepper(addr & 0x07);
|
|
}
|
|
else if ((addr & 0xFFFE) == 0xC0E8)
|
|
{
|
|
floppyDrive.ControlMotor(addr & 0x01);
|
|
}
|
|
else if ((addr & 0xFFFE) == 0xC0EA)
|
|
{
|
|
floppyDrive.DriveEnable(addr & 0x01);
|
|
}
|
|
else if (addr == 0xC0EC)
|
|
{
|
|
//change this to Write()? (and the other to Read()?) Dunno. Seems to work OK, but still...
|
|
//or DoIO
|
|
floppyDrive.ReadWrite();
|
|
}
|
|
else if (addr == 0xC0ED)
|
|
{
|
|
floppyDrive.SetLatchValue(b);
|
|
}
|
|
else if (addr == 0xC0EE)
|
|
{
|
|
floppyDrive.SetReadMode();
|
|
}
|
|
else if (addr == 0xC0EF)
|
|
{
|
|
floppyDrive.SetWriteMode();
|
|
}
|
|
|
|
if (addr >= 0xC000 && addr <= 0xCFFF)
|
|
return; // Protect LC bank #1 from being written to!
|
|
|
|
if (addr >= 0xD000)
|
|
{
|
|
if (writeRAM)
|
|
{
|
|
#if 0
|
|
if (addr <= 0xDFFF && visibleBank == LC_BANK_1)
|
|
ram[addr - 0x1000] = b;
|
|
else
|
|
ram[addr] = b;
|
|
#else
|
|
if (addr <= 0xDFFF && visibleBank == LC_BANK_1)
|
|
{
|
|
if (altzp)
|
|
ram2[addr - 0x1000] = b;
|
|
else
|
|
ram[addr - 0x1000] = b;
|
|
}
|
|
else
|
|
{
|
|
if (altzp)
|
|
ram2[addr] = b;
|
|
else
|
|
ram[addr] = b;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// Check for 80STORE mode (STORE80 takes precedence over RAMRD/WRT)...
|
|
if ((((addr >= 0x0400) && (addr <= 0x07FF)) || ((addr >= 0x2000) && (addr <= 0x3FFF))) && store80Mode)
|
|
{
|
|
if (displayPage2)
|
|
ram2[addr] = b;
|
|
else
|
|
ram[addr] = b;
|
|
|
|
return;
|
|
}
|
|
|
|
// Finally, check for auxillary/altzp write switches
|
|
#if 0
|
|
if (ramwrt)
|
|
ram2[addr] = b;
|
|
else
|
|
{
|
|
if (altzp)
|
|
ram2[addr] = b;
|
|
else
|
|
ram[addr] = b;
|
|
}
|
|
#else
|
|
if (addr < 0x0200)
|
|
// if (addr < 0x0200 || addr >= 0xD000)
|
|
{
|
|
#if 0
|
|
if (addr == 0x38)
|
|
WriteLog("Write $38: $%02X\n", b);
|
|
else if (addr == 0x39)
|
|
WriteLog("Write $39: $%02X\n", b);
|
|
#endif
|
|
if (altzp)
|
|
ram2[addr] = b;
|
|
else
|
|
ram[addr] = b;
|
|
}
|
|
else
|
|
{
|
|
if (ramwrt)
|
|
ram2[addr] = b;
|
|
else
|
|
ram[addr] = b;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
//
|
|
// Load a file into RAM/ROM image space
|
|
//
|
|
bool LoadImg(char * filename, uint8_t * ram, int size)
|
|
{
|
|
FILE * fp = fopen(filename, "rb");
|
|
|
|
if (fp == NULL)
|
|
return false;
|
|
|
|
fread(ram, 1, size, fp);
|
|
fclose(fp);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
static void SaveApple2State(const char * filename)
|
|
{
|
|
}
|
|
|
|
|
|
static bool LoadApple2State(const char * filename)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
|
|
#ifdef CPU_CLOCK_CHECKING
|
|
uint8_t counter = 0;
|
|
uint32_t totalCPU = 0;
|
|
uint64_t lastClock = 0;
|
|
#endif
|
|
//
|
|
// Main loop
|
|
//
|
|
int main(int /*argc*/, char * /*argv*/[])
|
|
{
|
|
InitLog("./apple2.log");
|
|
LoadSettings();
|
|
srand(time(NULL)); // Initialize RNG
|
|
|
|
// Zero out memory
|
|
memset(ram, 0, 0x10000);
|
|
memset(rom, 0, 0x10000);
|
|
memset(ram2, 0, 0x10000);
|
|
|
|
#if 1
|
|
// Set up MMU
|
|
SetupAddressMap();
|
|
|
|
// Set up V65C02 execution context
|
|
memset(&mainCPU, 0, sizeof(V65C02REGS));
|
|
mainCPU.RdMem = AppleReadMem;
|
|
mainCPU.WrMem = AppleWriteMem;
|
|
#else
|
|
mainCPU.RdMem = RdMem;
|
|
mainCPU.WrMem = WrMem;
|
|
#endif
|
|
mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
|
|
|
|
// alternateCharset = true;
|
|
// if (!LoadImg(settings.BIOSPath, rom + 0xD000, 0x3000))
|
|
if (!LoadImg(settings.BIOSPath, rom + 0xC000, 0x4000))
|
|
{
|
|
WriteLog("Could not open file '%s'!\n", settings.BIOSPath);
|
|
return -1;
|
|
}
|
|
|
|
//This is now included...
|
|
/* if (!LoadImg(settings.diskPath, diskRom, 0x100))
|
|
{
|
|
WriteLog("Could not open file '%s'!\nDisk II will be unavailable!\n", settings.diskPath);
|
|
// return -1;
|
|
}//*/
|
|
|
|
//Load up disk image from config file (for now)...
|
|
floppyDrive.LoadImage(settings.diskImagePath1, 0);
|
|
floppyDrive.LoadImage(settings.diskImagePath2, 1);
|
|
// floppyDrive.LoadImage("./disks/temp.nib", 1); // Load temp .nib file into second drive...
|
|
|
|
//Kill the DOS ROM in slot 6 for now...
|
|
//not
|
|
// memcpy(rom + 0xC600, diskROM, 0x100);
|
|
// memcpy(rom + 0xC700, diskROM, 0x100); // Slot 7???
|
|
|
|
WriteLog("About to initialize video...\n");
|
|
|
|
if (!InitVideo())
|
|
{
|
|
std::cout << "Aborting!" << std::endl;
|
|
return -1;
|
|
}
|
|
|
|
// Have to do this *after* video init but *before* sound init...!
|
|
//Shouldn't be necessary since we're not doing emulation in the ISR...
|
|
if (settings.autoStateSaving)
|
|
{
|
|
// Load last state from file...
|
|
if (!LoadApple2State(settings.autoStatePath))
|
|
WriteLog("Unable to use Apple2 state file \"%s\"!\n", settings.autoStatePath);
|
|
}
|
|
|
|
|
|
#if 0
|
|
// State loading!
|
|
if (!LoadImg("./BT1_6502_RAM_SPACE.bin", ram, 0x10000))
|
|
{
|
|
cout << "Couldn't load state file!" << endl;
|
|
cout << "Aborting!!" << endl;
|
|
return -1;
|
|
}
|
|
|
|
//A P Y X S PC
|
|
//-- -- -- -- ----- -----
|
|
//00 75 3B 53 FD 01 41 44
|
|
|
|
mainCPU.cpuFlags = 0;
|
|
mainCPU.a = 0x00;
|
|
mainCPU.x = 0x53;
|
|
mainCPU.y = 0x3B;
|
|
mainCPU.cc = 0x75;
|
|
mainCPU.sp = 0xFD;
|
|
mainCPU.pc = 0x4441;
|
|
|
|
textMode = false;
|
|
mixedMode = false;
|
|
displayPage2 = false;
|
|
hiRes = true;
|
|
|
|
//kludge...
|
|
readHiRam = true;
|
|
//dumpDis=true;
|
|
//kludge II...
|
|
memcpy(ram + 0xD000, ram + 0xC000, 0x1000);
|
|
#endif
|
|
|
|
WriteLog("About to initialize audio...\n");
|
|
SoundInit();
|
|
//nope SDL_EnableUNICODE(1); // Needed to do key translation shit
|
|
|
|
// gui = new GUI(surface); // Set up the GUI system object...
|
|
// gui = new GUI(mainSurface); // Set up the GUI system object...
|
|
// SDL 2... this will likely cause Apple 2 to crash
|
|
// gui = new GUI(NULL); // Set up the GUI system object...
|
|
#if 0
|
|
gui->AddMenuTitle("Apple2");
|
|
gui->AddMenuItem("Test!", TestWindow/*, hotkey*/);
|
|
gui->AddMenuItem("");
|
|
gui->AddMenuItem("Quit", QuitEmulator, SDLK_q);
|
|
gui->CommitItemsToMenu();
|
|
#endif
|
|
|
|
SetupBlurTable(); // Set up the color TV emulation blur table
|
|
running = true; // Set running status...
|
|
|
|
InitializeEventList(); // Clear the event list before we use it...
|
|
SetCallbackTime(FrameCallback, 16666.66666667); // Set frame to fire at 1/60 s interval
|
|
SetCallbackTime(BlinkTimer, 250000); // Set up blinking at 1/4 s intervals
|
|
startTicks = SDL_GetTicks();
|
|
|
|
#ifdef THREADED_65C02
|
|
cpuCond = SDL_CreateCond();
|
|
mainSem = SDL_CreateSemaphore(1);
|
|
cpuThread = SDL_CreateThread(CPUThreadFunc, NULL, NULL);
|
|
//Hmm... CPU does POST (+1), wait, then WAIT (-1)
|
|
// SDL_sem * mainMutex = SDL_CreateMutex();
|
|
#endif
|
|
|
|
WriteLog("Entering main loop...\n");
|
|
while (running)
|
|
{
|
|
double timeToNextEvent = GetTimeToNextEvent();
|
|
#ifndef THREADED_65C02
|
|
Execute65C02(&mainCPU, USEC_TO_M6502_CYCLES(timeToNextEvent));
|
|
#endif
|
|
//We MUST remove a frame's worth of time in order for the CPU to function... !!! FIX !!!
|
|
//(Fix so that this is not a requirement!)
|
|
//Fixed, but mainCPU.clock is destroyed in the bargain. Oh well.
|
|
// mainCPU.clock -= USEC_TO_M6502_CYCLES(timeToNextEvent);
|
|
|
|
#ifdef CPU_CLOCK_CHECKING
|
|
#ifndef THREADED_65C02
|
|
totalCPU += USEC_TO_M6502_CYCLES(timeToNextEvent);
|
|
#endif
|
|
#endif
|
|
// Handle CPU time delta for sound...
|
|
//Don't need this anymore now that we use absolute time...
|
|
// AddToSoundTimeBase(USEC_TO_M6502_CYCLES(timeToNextEvent));
|
|
HandleNextEvent();
|
|
}
|
|
|
|
#ifdef THREADED_65C02
|
|
WriteLog("Main: cpuFinished = true;\n");
|
|
cpuFinished = true;
|
|
//#warning "If sound thread is behind, CPU thread will never wake up... !!! FIX !!!" [DONE]
|
|
//What to do? How do you know when the CPU is sleeping???
|
|
//USE A CONDITIONAL!!! OF COURSE!!!!!!11!11!11!!!1!
|
|
#if 0
|
|
SDL_mutexP(mainMutex);
|
|
SDL_CondWait(mainCond, mainMutex); // Wait for CPU thread to get to signal point...
|
|
SDL_mutexV(mainMutex);
|
|
#else
|
|
//Nope, use a semaphore...
|
|
WriteLog("Main: SDL_SemWait(mainSem);\n");
|
|
SDL_SemWait(mainSem);//should lock until CPU thread is waiting...
|
|
#endif
|
|
|
|
WriteLog("Main: SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up\n");
|
|
SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up
|
|
WriteLog("Main: SDL_WaitThread(cpuThread, NULL);\n");
|
|
SDL_WaitThread(cpuThread, NULL);
|
|
//nowok:SDL_WaitThread(CPUThreadFunc, NULL);
|
|
WriteLog("Main: SDL_DestroyCond(cpuCond);\n");
|
|
SDL_DestroyCond(cpuCond);
|
|
|
|
//SDL_DestroyMutex(mainMutex);
|
|
SDL_DestroySemaphore(mainSem);
|
|
#endif
|
|
|
|
if (settings.autoStateSaving)
|
|
{
|
|
// Save state here...
|
|
SaveApple2State(settings.autoStatePath);
|
|
}
|
|
floppyDrive.SaveImage(0);
|
|
floppyDrive.SaveImage(1);
|
|
|
|
SoundDone();
|
|
VideoDone();
|
|
SaveSettings();
|
|
LogDone();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
Apple II keycodes
|
|
-----------------
|
|
|
|
Key Aln CTL SHF BTH
|
|
-----------------------
|
|
space $A0 $A0 $A0 $A0 No xlation
|
|
RETURN $8D $8D $8D $8D No xlation
|
|
0 $B0 $B0 $B0 $B0 Need to screen shift+0 (?)
|
|
1! $B1 $B1 $A1 $A1 No xlation
|
|
2" $B2 $B2 $A2 $A2 No xlation
|
|
3# $B3 $B3 $A3 $A3 No xlation
|
|
4$ $B4 $B4 $A4 $A4 No xlation
|
|
5% $B5 $B5 $A5 $A5 No xlation
|
|
6& $B6 $B6 $A6 $A6 No xlation
|
|
7' $B7 $B7 $A7 $A7 No xlation
|
|
8( $B8 $B8 $A8 $A8 No xlation
|
|
9) $B9 $B9 $A9 $A9 No xlation
|
|
:* $BA $BA $AA $AA No xlation
|
|
;+ $BB $BB $AB $AB No xlation
|
|
,< $AC $AC $BC $BC No xlation
|
|
-= $AD $AD $BD $BD No xlation
|
|
.> $AE $AE $BE $BE No xlation
|
|
/? $AF $AF $BF $BF No xlation
|
|
A $C1 $81 $C1 $81
|
|
B $C2 $82 $C2 $82
|
|
C $C3 $83 $C3 $83
|
|
D $C4 $84 $C4 $84
|
|
E $C5 $85 $C5 $85
|
|
F $C6 $86 $C6 $86
|
|
G $C7 $87 $C7 $87
|
|
H $C8 $88 $C8 $88
|
|
I $C9 $89 $C9 $89
|
|
J $CA $8A $CA $8A
|
|
K $CB $8B $CB $8B
|
|
L $CC $8C $CC $8C
|
|
M $CD $8D $DD $9D -> ODD
|
|
N^ $CE $8E $DE $9E -> ODD
|
|
O $CF $8F $CF $8F
|
|
P@ $D0 $90 $C0 $80 Need to xlate CTL+SHFT+P & SHFT+P (?)
|
|
Q $D1 $91 $D1 $91
|
|
R $D2 $92 $D2 $92
|
|
S $D3 $93 $D3 $93
|
|
T $D4 $94 $D4 $94
|
|
U $D5 $95 $D5 $95
|
|
V $D6 $96 $D6 $96
|
|
W $D7 $97 $D7 $97
|
|
X $D8 $98 $D8 $98
|
|
Y $D9 $99 $D9 $99
|
|
Z $DA $9A $DA $9A
|
|
<- $88 $88 $88 $88
|
|
-> $95 $95 $95 $95
|
|
ESC $9B $9B $9B $9B No xlation
|
|
|
|
*/
|
|
//static uint64_t lastCPUCycles = 0;
|
|
static uint32_t frameCount = 0;
|
|
static void FrameCallback(void)
|
|
{
|
|
SDL_Event event;
|
|
|
|
while (SDL_PollEvent(&event))
|
|
{
|
|
switch (event.type)
|
|
{
|
|
// Problem with using SDL_TEXTINPUT is that it causes key delay. :-/
|
|
case SDL_TEXTINPUT:
|
|
//Need to do some key translation here, and screen out non-apple keys as well...
|
|
//(really, could do it all in SDL_KEYDOWN, would just have to get symbols &
|
|
// everything else done separately. this is slightly easier. :-P)
|
|
// if (event.key.keysym.sym == SDLK_TAB) // Prelim key screening...
|
|
if (event.edit.text[0] == '\t') // Prelim key screening...
|
|
break;
|
|
|
|
lastKeyPressed = event.edit.text[0];
|
|
keyDown = true;
|
|
|
|
//kludge: should have a caps lock thingy here...
|
|
//or all uppercase for ][+...
|
|
// if (lastKeyPressed >= 'a' && lastKeyPressed <='z')
|
|
// lastKeyPressed &= 0xDF; // Convert to upper case...
|
|
|
|
break;
|
|
case SDL_KEYDOWN:
|
|
// CTRL+RESET key emulation (mapped to CTRL+`)
|
|
// This doesn't work...
|
|
// if (event.key.keysym.sym == SDLK_BREAK && (event.key.keysym.mod & KMOD_CTRL))
|
|
// if (event.key.keysym.sym == SDLK_PAUSE && (event.key.keysym.mod & KMOD_CTRL))
|
|
if (event.key.keysym.sym == SDLK_BACKQUOTE && (event.key.keysym.mod & KMOD_CTRL))
|
|
//NOTE that this shouldn't take place until the key is lifted... !!! FIX !!!
|
|
//ALSO it seems to leave the machine in an inconsistent state vis-a-vis the language card...
|
|
mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
|
|
|
|
if (event.key.keysym.sym == SDLK_RIGHT)
|
|
lastKeyPressed = 0x15, keyDown = true;
|
|
else if (event.key.keysym.sym == SDLK_LEFT)
|
|
lastKeyPressed = 0x08, keyDown = true;
|
|
else if (event.key.keysym.sym == SDLK_UP)
|
|
lastKeyPressed = 0x0B, keyDown = true;
|
|
else if (event.key.keysym.sym == SDLK_DOWN)
|
|
lastKeyPressed = 0x0A, keyDown = true;
|
|
else if (event.key.keysym.sym == SDLK_RETURN)
|
|
lastKeyPressed = 0x0D, keyDown = true;
|
|
else if (event.key.keysym.sym == SDLK_ESCAPE)
|
|
lastKeyPressed = 0x1B, keyDown = true;
|
|
else if (event.key.keysym.sym == SDLK_BACKSPACE)
|
|
lastKeyPressed = 0x7F, keyDown = true;
|
|
|
|
// Fix CTRL+key combo...
|
|
if (event.key.keysym.mod & KMOD_CTRL)
|
|
{
|
|
if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
|
|
{
|
|
lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 1;
|
|
keyDown = true;
|
|
//printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
|
|
}
|
|
}
|
|
|
|
// Use ALT+Q to exit, as well as the usual window decoration method
|
|
if (event.key.keysym.sym == SDLK_q && (event.key.keysym.mod & KMOD_ALT))
|
|
running = false;
|
|
|
|
if (event.key.keysym.sym == SDLK_PAUSE)
|
|
{
|
|
pauseMode = !pauseMode;
|
|
|
|
if (pauseMode)
|
|
{
|
|
SoundPause();
|
|
SpawnMessage("*** PAUSED ***");
|
|
}
|
|
else
|
|
{
|
|
SoundResume();
|
|
SpawnMessage("*** RESUME ***");
|
|
}
|
|
}
|
|
|
|
// Paddle buttons 0 & 1
|
|
if (event.key.keysym.sym == SDLK_INSERT)
|
|
openAppleDown = true;
|
|
if (event.key.keysym.sym == SDLK_PAGEUP)
|
|
closedAppleDown = true;
|
|
|
|
if (event.key.keysym.sym == SDLK_F11)
|
|
dumpDis = !dumpDis; // Toggle the disassembly process
|
|
// else if (event.key.keysym.sym == SDLK_F11)
|
|
// floppyDrive.LoadImage("./disks/bt1_char.dsk");//Kludge to load char disk...
|
|
else if (event.key.keysym.sym == SDLK_F9)
|
|
{
|
|
floppyDrive.CreateBlankImage();
|
|
// SpawnMessage("Image cleared...");
|
|
}//*/
|
|
else if (event.key.keysym.sym == SDLK_F10)
|
|
{
|
|
floppyDrive.SwapImages();
|
|
// SpawnMessage("Image swapped...");
|
|
}//*/
|
|
|
|
if (event.key.keysym.sym == SDLK_F2)// Toggle the palette
|
|
TogglePalette();
|
|
else if (event.key.keysym.sym == SDLK_F3)// Cycle through screen types
|
|
CycleScreenTypes();
|
|
|
|
// if (event.key.keysym.sym == SDLK_F5) // Temp GUI launch key
|
|
if (event.key.keysym.sym == SDLK_F1) // GUI launch key
|
|
//NOTE: Should parse the output to determine whether or not the user requested
|
|
// to quit completely... !!! FIX !!!
|
|
gui->Run();
|
|
|
|
if (event.key.keysym.sym == SDLK_F5)
|
|
{
|
|
VolumeDown();
|
|
char volStr[19] = "[****************]";
|
|
// volStr[GetVolume()] = 0;
|
|
for(int i=GetVolume(); i<16; i++)
|
|
volStr[1 + i] = '-';
|
|
SpawnMessage("Volume: %s", volStr);
|
|
}
|
|
else if (event.key.keysym.sym == SDLK_F6)
|
|
{
|
|
VolumeUp();
|
|
char volStr[19] = "[****************]";
|
|
// volStr[GetVolume()] = 0;
|
|
for(int i=GetVolume(); i<16; i++)
|
|
volStr[1 + i] = '-';
|
|
SpawnMessage("Volume: %s", volStr);
|
|
}
|
|
|
|
static bool fullscreenDebounce = false;
|
|
|
|
if (event.key.keysym.sym == SDLK_F12)
|
|
{
|
|
if (!fullscreenDebounce)
|
|
{
|
|
ToggleFullScreen();
|
|
fullscreenDebounce = true;
|
|
}
|
|
}
|
|
// else
|
|
|
|
break;
|
|
case SDL_KEYUP:
|
|
if (event.key.keysym.sym == SDLK_F12)
|
|
fullscreenDebounce = false;
|
|
|
|
// Paddle buttons 0 & 1
|
|
if (event.key.keysym.sym == SDLK_INSERT)
|
|
openAppleDown = false;
|
|
if (event.key.keysym.sym == SDLK_PAGEUP)
|
|
closedAppleDown = false;
|
|
|
|
// if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
|
|
// keyDown = false;
|
|
|
|
break;
|
|
case SDL_QUIT:
|
|
running = false;
|
|
}
|
|
}
|
|
|
|
//#warning "!!! Taking MAJOR time hit with the video frame rendering !!!"
|
|
RenderVideoFrame();
|
|
SetCallbackTime(FrameCallback, 16666.66666667);
|
|
|
|
#ifdef CPU_CLOCK_CHECKING
|
|
//We know it's stopped, so we can get away with this...
|
|
counter++;
|
|
if (counter == 60)
|
|
{
|
|
uint64_t clock = GetCurrentV65C02Clock();
|
|
//totalCPU += (uint32_t)(clock - lastClock);
|
|
|
|
printf("Executed %u cycles...\n", (uint32_t)(clock - lastClock));
|
|
lastClock = clock;
|
|
// totalCPU = 0;
|
|
counter = 0;
|
|
}
|
|
#endif
|
|
//Instead of this, we should yield remaining time to other processes... !!! FIX !!! [DONE]
|
|
//lessee...
|
|
//nope.
|
|
//Actually, slows things down too much...
|
|
//SDL_Delay(10);
|
|
// while (SDL_GetTicks() - startTicks < 16); // Wait for next frame...
|
|
|
|
// This is the problem: If you set the interval to 16, it runs faster than
|
|
// 1/60s per frame. If you set it to 17, it runs slower. What we need is to
|
|
// have it do 16 for one frame, then 17 for two others. Then it should average
|
|
// out to 1/60s per frame every 3 frames.
|
|
frameCount = (frameCount + 1) % 3;
|
|
|
|
uint32_t waitFrameTime = 17 - (frameCount == 0 ? 1 : 0);
|
|
|
|
while (SDL_GetTicks() - startTicks < waitFrameTime)
|
|
SDL_Delay(1); // Wait for next frame...
|
|
|
|
startTicks = SDL_GetTicks();
|
|
#if 0
|
|
uint64_t cpuCycles = GetCurrentV65C02Clock();
|
|
uint32_t cyclesBurned = (uint32_t)(cpuCycles - lastCPUCycles);
|
|
WriteLog("FrameCallback: used %i cycles\n", cyclesBurned);
|
|
lastCPUCycles = cpuCycles;
|
|
#endif
|
|
|
|
//let's wait, then signal...
|
|
//works longer, but then still falls behind...
|
|
#ifdef THREADED_65C02
|
|
if (!pauseMode)
|
|
SDL_CondSignal(cpuCond);//OK, let the CPU go another frame...
|
|
#endif
|
|
}
|
|
|
|
|
|
static void BlinkTimer(void)
|
|
{
|
|
flash = !flash;
|
|
SetCallbackTime(BlinkTimer, 250000); // Set up blinking at 1/4 sec intervals
|
|
}
|
|
|
|
|
|
/*
|
|
Next problem is this: How to have events occur and synchronize with the rest
|
|
of the threads?
|
|
|
|
o Have the CPU thread manage the timer mechanism? (need to have a method of carrying
|
|
remainder CPU cycles over...)
|
|
|
|
One way would be to use a fractional accumulator, then subtract 1 every
|
|
time it overflows. Like so:
|
|
|
|
double overflow = 0;
|
|
uint32_t time = 20;
|
|
while (!done)
|
|
{
|
|
Execute6808(&soundCPU, time);
|
|
overflow += 0.289115646;
|
|
if (overflow > 1.0)
|
|
{
|
|
overflow -= 1.0;
|
|
time = 21;
|
|
}
|
|
else
|
|
time = 20;
|
|
}
|
|
*/
|