mirror of
https://github.com/AppleWin/AppleWin.git
synced 2025-02-26 21:30:36 +00:00
Added floating bus emulation.
Summary of changes: AppleWin.cpp: Made dwCyclesThisFrame global -> g_dwCyclesThisFrame. CPU.cpp: Made InternalCpuExecute()'s nCyclesLeft static -> nInternalCyclesLeft. CPU.cpp: Added CpuGetCyclesThisFrame(). Memory.cpp: Added MemGet80Store(). Memory.cpp: Added MemReadFloatingBus(). Memory.cpp: Added MemReadFloatingBus(BYTE const highbit). Memory.cpp: Changed NullIo() to call MemReadFloatingBus(). Video.cpp: Added video scanner constants and VideoGetScannerAddress(bool* pbVblBar_OUT). Video.cpp: Changed VideoCheckVbl() to call VideoGetScannerAddress(). Various files: Replaced MemReturnRandomData() calls with MemReadFloatingBus().
This commit is contained in:
nick_westgate
parent
92b86a43e1
commit
35ec4f29b2
@ -53,6 +53,8 @@ double g_fCurrentCLK6502 = CLK_6502; // Affected by Config dialog's speed slide
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static double g_fMHz = 1.0; // Affected by Config dialog's speed slider bar
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int g_nCpuCyclesFeedback = 0;
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DWORD g_dwCyclesThisFrame = 0;
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FILE* g_fh = NULL;
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bool g_bDisableDirectSound = false;
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@ -86,7 +88,6 @@ ULONGLONG g_nPerfFreq = 0;
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void ContinueExecution()
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{
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static DWORD dwCyclesThisFrame = 0;
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static BOOL pageflipping = 0; //?
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const double fUsecPerSec = 1.e6;
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@ -128,7 +129,7 @@ void ContinueExecution()
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DWORD dwExecutedCycles = CpuExecute(nCyclesToExecute);
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dwCyclesThisFrame += dwExecutedCycles;
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g_dwCyclesThisFrame += dwExecutedCycles;
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//
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@ -137,7 +138,7 @@ void ContinueExecution()
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CheckFastPaging();
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DiskUpdatePosition(dwExecutedCycles);
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JoyUpdatePosition();
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VideoUpdateVbl(dwCyclesThisFrame);
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VideoUpdateVbl(g_dwCyclesThisFrame);
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SpkrUpdate(cyclenum);
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CommUpdate(cyclenum);
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@ -182,9 +183,9 @@ void ContinueExecution()
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//
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if(dwCyclesThisFrame >= dwClksPerFrame)
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if(g_dwCyclesThisFrame >= dwClksPerFrame)
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{
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dwCyclesThisFrame -= dwClksPerFrame;
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g_dwCyclesThisFrame -= dwClksPerFrame;
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if(mode != MODE_LOGO)
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{
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@ -19,6 +19,8 @@ extern DWORD g_dwSpeed;
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extern double g_fCurrentCLK6502;
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extern int g_nCpuCyclesFeedback;
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extern DWORD g_dwCyclesThisFrame;
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extern FILE* g_fh; // Filehandle for log file
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extern bool g_bDisableDirectSound; // Cmd line switch: don't init DS (so no MB support)
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@ -104,6 +104,8 @@ unsigned __int64 g_nCumulativeCycles = 0;
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static ULONG g_nCyclesSubmitted; // Number of cycles submitted to CpuExecute()
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static ULONG g_nCyclesExecuted;
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static signed long nInternalCyclesLeft;
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/****************************************************************************
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*
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* GENERAL PURPOSE MACROS
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@ -132,10 +134,10 @@ static ULONG g_nCyclesExecuted;
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regs.sp = 0x1FF;
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#define READ ( \
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((addr & 0xFF00) == 0xC000) \
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? ioread[addr & 0xFF](regs.pc,(BYTE)addr,0,0,nCyclesLeft) \
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? ioread[addr & 0xFF](regs.pc,(BYTE)addr,0,0,nInternalCyclesLeft) \
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: ( \
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(((addr & 0xFF00) == 0xC400) || ((addr & 0xFF00) == 0xC500)) \
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? CxReadFunc(regs.pc, addr, 0, 0, nCyclesLeft) \
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? CxReadFunc(regs.pc, addr, 0, 0, nInternalCyclesLeft) \
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: *(mem+addr) \
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) \
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)
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@ -152,9 +154,9 @@ static ULONG g_nCyclesExecuted;
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if (page) \
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*(page+(addr & 0xFF)) = (BYTE)(a); \
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else if ((addr & 0xFF00) == 0xC000) \
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iowrite[addr & 0xFF](regs.pc,(BYTE)addr,1,(BYTE)(a),nCyclesLeft); \
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iowrite[addr & 0xFF](regs.pc,(BYTE)addr,1,(BYTE)(a),nInternalCyclesLeft); \
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else if(((addr & 0xFF00) == 0xC400) || ((addr & 0xFF00) == 0xC500)) \
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CxWriteFunc(regs.pc, addr, 1, (BYTE)(a), nCyclesLeft); \
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CxWriteFunc(regs.pc, addr, 1, (BYTE)(a), nInternalCyclesLeft); \
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}
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//
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@ -483,7 +485,7 @@ static DWORD InternalCpuExecute (DWORD totalcycles)
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do
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{
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signed long nCyclesLeft = (totalcycles<<8) - (cycles<<8);
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nInternalCyclesLeft = (totalcycles<<8) - (cycles<<8);
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USHORT uExtraCycles = 0;
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if(regs.bIRQ && !(regs.ps & AF_INTERRUPT))
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@ -819,6 +821,14 @@ void CpuCalcCycles(ULONG nCyclesLeft)
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//===========================================================================
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ULONG CpuGetCyclesThisFrame()
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{
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CpuCalcCycles(nInternalCyclesLeft); // TODO: simplify the whole cycle system!
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return g_dwCyclesThisFrame + g_nCyclesExecuted;
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}
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//===========================================================================
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DWORD CpuExecute (DWORD cycles)
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{
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static BOOL laststep = 0;
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@ -22,6 +22,7 @@ void CpuDestroy ();
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void CpuCalcCycles(ULONG nCyclesLeft);
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DWORD CpuExecute (DWORD);
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void CpuGetCode (WORD,LPBYTE *,DWORD *);
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ULONG CpuGetCyclesThisFrame();
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void CpuInitialize ();
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void CpuReinitialize ();
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void CpuResetCompilerData ();
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@ -395,7 +395,7 @@ BYTE __stdcall JoyReadButton (WORD, BYTE address, BYTE, BYTE, ULONG)
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break;
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}
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return MemReturnRandomData(pressed);
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return MemReadFloatingBus(pressed);
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}
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//===========================================================================
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@ -431,7 +431,7 @@ BYTE __stdcall JoyReadPosition (WORD programcounter, BYTE address, BYTE, BYTE, U
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BOOL nPdlCntrActive = g_nCumulativeCycles <= (g_nJoyCntrResetCycle + (unsigned __int64) ((double)nPdlPos * PDL_CNTR_INTERVAL));
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return MemReturnRandomData(nPdlCntrActive);
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return MemReadFloatingBus(nPdlCntrActive);
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}
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//===========================================================================
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@ -453,7 +453,7 @@ BYTE __stdcall JoyResetPosition (WORD, BYTE, BYTE, BYTE, ULONG nCyclesLeft)
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if(joyinfo[joytype[1]].device == DEVICE_JOYSTICK)
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CheckJoystick1();
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return MemReturnRandomData(1);
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return MemReadFloatingBus();
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}
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//===========================================================================
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@ -616,37 +616,14 @@ void BackMainImage () {
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//===========================================================================
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BYTE __stdcall NullIo (WORD programcounter, BYTE address, BYTE write, BYTE value, ULONG nCycles) {
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if ((address & 0xF0) == 0xA0) {
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static const BYTE retval[16] = {0x58,0xFC,0x5B,0xFF,0x58,0xFC,0x5B,0xFF,
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0x0B,0x10,0x00,0x00,0xFF,0xFF,0xFF,0xFF};
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return retval[address & 15];
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if (!write)
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{
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return MemReadFloatingBus();
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}
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else if ((address >= 0xB0) && (address <= 0xCF)) {
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BYTE r = (BYTE)(rand() & 0xFF);
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if (r >= 0x10)
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return 0xA0;
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else if (r >= 8)
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return (r > 0xC) ? 0xFF : 0x00;
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else
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return (address & 0xF7);
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}
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else if ((address & 0xF0) == 0xD0) {
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BYTE r = (BYTE)(rand() & 0xFF);
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if (r >= 0xC0)
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return 0xC0;
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else if (r >= 0x80)
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return 0x80;
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else if ((address == 0xD0) || (address == 0xDF))
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return 0;
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else if (r >= 0x40)
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return 0x40;
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else if (r >= 0x30)
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return 0x90;
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else
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{
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return 0;
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}
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else
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return MemReturnRandomData(1);
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}
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//===========================================================================
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@ -837,6 +814,13 @@ void MemDestroy () {
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ZeroMemory(memshadow,sizeof(memshadow));
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}
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//===========================================================================
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bool MemGet80Store()
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{
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return SW_80STORE != 0;
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}
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//===========================================================================
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LPBYTE MemGetAuxPtr (WORD offset)
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{
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@ -1018,6 +1002,21 @@ BYTE MemReturnRandomData (BYTE highbit) {
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return retval[r & 15] | (highbit ? 0x80 : 0);
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}
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//===========================================================================
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BYTE MemReadFloatingBus()
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{
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return*(LPBYTE)(mem + VideoGetScannerAddress());
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}
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//===========================================================================
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BYTE MemReadFloatingBus(BYTE const highbit)
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{
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BYTE r = *(LPBYTE)(mem + VideoGetScannerAddress());
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return (r & ~0x80) | ((highbit) ? 0x80 : 0);
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}
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//===========================================================================
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void MemSetFastPaging (BOOL on) {
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if (fastpaging && modechanging) {
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@ -1110,13 +1109,13 @@ BYTE __stdcall MemSetPaging (WORD programcounter, BYTE address, BYTE write, BYTE
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if ((address >= 4) && (address <= 5) &&
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((*(LPDWORD)(mem+programcounter) & 0x00FFFEFF) == 0x00C0028D)) {
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modechanging = 1;
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return write ? 0 : MemReturnRandomData(1);
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return write ? 0 : MemReadFloatingBus(1);
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}
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if ((address >= 0x80) && (address <= 0x8F) && (programcounter < 0xC000) &&
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(((*(LPDWORD)(mem+programcounter) & 0x00FFFEFF) == 0x00C0048D) ||
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((*(LPDWORD)(mem+programcounter) & 0x00FFFEFF) == 0x00C0028D))) {
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modechanging = 1;
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return write ? 0 : MemReturnRandomData(1);
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return write ? 0 : MemReadFloatingBus(1);
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}
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// IF THE MEMORY PAGING MODE HAS CHANGED, UPDATE OUR MEMORY IMAGES AND
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@ -1142,10 +1141,9 @@ BYTE __stdcall MemSetPaging (WORD programcounter, BYTE address, BYTE write, BYTE
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}
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if ((address <= 1) || ((address >= 0x54) && (address <= 0x57)))
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VideoSetMode(programcounter,address,write,value,0);
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return write ? 0
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: MemReturnRandomData(((address == 0x54) || (address == 0x55))
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? (SW_PAGE2 != 0) : 1);
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return VideoSetMode(programcounter,address,write,value,0);
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return write ? 0 : MemReadFloatingBus();
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}
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//===========================================================================
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@ -24,9 +24,12 @@ extern UINT g_uMaxExPages; // user requested ram pages (from cmd line)
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#endif
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void MemDestroy ();
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bool MemGet80Store();
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LPBYTE MemGetAuxPtr (WORD);
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LPBYTE MemGetMainPtr (WORD);
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void MemInitialize ();
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BYTE MemReadFloatingBus();
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BYTE MemReadFloatingBus(BYTE highbit);
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void MemReset ();
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void MemResetPaging ();
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BYTE MemReturnRandomData (BYTE highbit);
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@ -492,7 +492,7 @@ BYTE __stdcall SpkrToggle (WORD, BYTE address, BYTE write, BYTE, ULONG nCyclesLe
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}
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return MemReturnRandomData(1);
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return MemReadFloatingBus();
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}
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//=============================================================================
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@ -150,6 +150,23 @@ enum Color_Palette_Index_e
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#define HGR_MATRIX_YOFFSET 2 // For tv emulation mode
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// video scanner constants
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int const kHBurstClock = 53; // clock when Color Burst starts
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int const kHBurstClocks = 4; // clocks per Color Burst duration
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int const kHClock0State = 0x18; // H[543210] = 011000
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int const kHClocks = 65; // clocks per horizontal scan (including HBL)
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int const kHPEClock = 40; // clock when HPE (horizontal preset enable) goes low
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int const kHPresetClock = 41; // clock when H state presets
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int const kHSyncClock = 49; // clock when HSync starts
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int const kHSyncClocks = 4; // clocks per HSync duration
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int const kNTSCScanLines = 262; // total scan lines including VBL (NTSC)
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int const kNTSCVSyncLine = 224; // line when VSync starts (NTSC)
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int const kPALScanLines = 312; // total scan lines including VBL (PAL)
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int const kPALVSyncLine = 264; // line when VSync starts (PAL)
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int const kVLine0State = 0x100; // V[543210CBA] = 100000000
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int const kVPresetLine = 256; // line when V state presets
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int const kVSyncLines = 4; // lines per VSync duration
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typedef BOOL (*UpdateFunc_t)(int,int,int,int,int);
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static BYTE celldirty[40][32];
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@ -195,6 +212,8 @@ DWORD videotype = VT_COLOR_TVEMU;
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static bool g_bTextFlashState = false;
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static bool g_bTextFlashFlag = false;
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static bool bVideoScannerNTSC = true; // NTSC video scanning (or PAL)
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//-------------------------------------
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// Video consts:
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@ -1465,7 +1484,7 @@ void VideoBenchmark () {
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//===========================================================================
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BYTE __stdcall VideoCheckMode (WORD, BYTE address, BYTE, BYTE, ULONG) {
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if (address == 0x7F)
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return MemReturnRandomData(SW_DHIRES != 0);
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return MemReadFloatingBus(SW_DHIRES != 0);
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else {
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BOOL result = 0;
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switch (address) {
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@ -1526,13 +1545,18 @@ BYTE __stdcall VideoCheckVbl (WORD, BYTE, BYTE, BYTE, ULONG)
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BBBE F0 F5 BEQ $BBB5
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BBC0 C9 0F CMP #$0F
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BBC2 F0 F1 BEQ $BBB5
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*/
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// return MemReturnRandomData(dwVBlCounter <= nVBlStop_NTSC);
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if (dwVBlCounter <= nVBlStop_NTSC)
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return (BYTE)(dwVBlCounter & 0x7F); // 0x00;
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else
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return 0x80 | ((BYTE)(dwVBlCounter & 1));
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*/
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bool bVblBar;
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VideoGetScannerAddress(&bVblBar);
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BYTE r = KeybGetKeycode();
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return (r & ~0x80) | ((bVblBar) ? 0x80 : 0);
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}
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//===========================================================================
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@ -1957,10 +1981,7 @@ BYTE __stdcall VideoSetMode (WORD, BYTE address, BYTE write, BYTE, ULONG) {
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}
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lastpageflip = emulmsec;
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}
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if (address == 0x50)
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return VideoCheckVbl(0,0,0,0,0);
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else
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return MemReturnRandomData(1);
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return MemReadFloatingBus();
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}
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//===========================================================================
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@ -2006,6 +2027,8 @@ DWORD VideoGetSnapshot(SS_IO_Video* pSS)
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return 0;
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}
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//===========================================================================
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DWORD VideoSetSnapshot(SS_IO_Video* pSS)
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{
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charoffs = !pSS->bAltCharSet ? 0 : 256;
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@ -2018,3 +2041,116 @@ DWORD VideoSetSnapshot(SS_IO_Video* pSS)
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return 0;
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}
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//===========================================================================
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WORD VideoGetScannerAddress(bool* pbVblBar_OUT)
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{
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// get video scanner position
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//
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int nCycles = CpuGetCyclesThisFrame();
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// machine state switches
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//
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int nHires = (SW_HIRES) ? 1 : 0;
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int nPage2 = (SW_PAGE2) ? 1 : 0;
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int n80Store = (MemGet80Store()) ? 1 : 0;
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// calculate video parameters according to display standard
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//
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int nScanLines = bVideoScannerNTSC ? kNTSCScanLines : kPALScanLines;
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int nVSyncLine = bVideoScannerNTSC ? kNTSCVSyncLine : kPALVSyncLine;
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int nScanCycles = nScanLines * kHClocks;
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// calculate horizontal scanning state
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//
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int nHClock = (nCycles + kHPEClock) % kHClocks; // which horizontal scanning clock
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int nHState = kHClock0State + nHClock; // H state bits
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if (nHClock >= kHPresetClock) // check for horizontal preset
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{
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nHState -= 1; // correct for state preset (two 0 states)
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}
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int h_0 = (nHState >> 0) & 1; // get horizontal state bits
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int h_1 = (nHState >> 1) & 1;
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int h_2 = (nHState >> 2) & 1;
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int h_3 = (nHState >> 3) & 1;
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int h_4 = (nHState >> 4) & 1;
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int h_5 = (nHState >> 5) & 1;
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// calculate vertical scanning state
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//
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int nVLine = nCycles / kHClocks; // which vertical scanning line
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int nVState = kVLine0State + nVLine; // V state bits
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if ((nVLine >= kVPresetLine)) // check for previous vertical state preset
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{
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nVState -= nScanLines; // compensate for preset
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}
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int v_A = (nVState >> 0) & 1; // get vertical state bits
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int v_B = (nVState >> 1) & 1;
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int v_C = (nVState >> 2) & 1;
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int v_0 = (nVState >> 3) & 1;
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int v_1 = (nVState >> 4) & 1;
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int v_2 = (nVState >> 5) & 1;
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int v_3 = (nVState >> 6) & 1;
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int v_4 = (nVState >> 7) & 1;
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int v_5 = (nVState >> 8) & 1;
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// calculate scanning memory address
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//
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if (SW_HIRES && SW_MIXED && (v_4 & v_2))
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{
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nHires = 0; // (address is in text memory)
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}
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int nAddend0 = 0x68; // 1 1 0 1
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int nAddend1 = (h_5 << 5) | (h_4 << 4) | (h_3 << 3);
|
||||
int nAddend2 = (v_4 << 6) | (v_3 << 5) | (v_4 << 4) | (v_3 << 3);
|
||||
int nSum = (nAddend0 + nAddend1 + nAddend2) & (0x0F << 3);
|
||||
|
||||
int nAddress = 0;
|
||||
nAddress |= h_0 << 0; // a0
|
||||
nAddress |= h_1 << 1; // a1
|
||||
nAddress |= h_2 << 2; // a2
|
||||
nAddress |= nSum; // a3 - aa6
|
||||
nAddress |= v_0 << 7; // a7
|
||||
nAddress |= v_1 << 8; // a8
|
||||
nAddress |= v_2 << 9; // a9
|
||||
nAddress |= ((nHires) ? v_A : (1 ^ (nPage2 & (1 ^ n80Store)))) << 10; // a10
|
||||
nAddress |= ((nHires) ? v_B : (nPage2 & (1 ^ n80Store))) << 11; // a11
|
||||
if (nHires) // hires?
|
||||
{
|
||||
// Y: insert hires only address bits
|
||||
//
|
||||
nAddress |= v_C << 12; // a12
|
||||
nAddress |= (1 ^ (nPage2 & (1 ^ n80Store))) << 13; // a13
|
||||
nAddress |= (nPage2 & (1 ^ n80Store)) << 14; // a14
|
||||
}
|
||||
else
|
||||
{
|
||||
// N: text, so no higher address bits unless Apple ][, not Apple //e
|
||||
//
|
||||
if ((!apple2e) && // Apple ][?
|
||||
(kHPEClock <= nHClock) && // Y: HBL?
|
||||
(nHClock <= (kHClocks - 1)))
|
||||
{
|
||||
nAddress |= 1 << 12; // Y: a12 (add $1000 to address!)
|
||||
}
|
||||
}
|
||||
|
||||
// update VBL' state
|
||||
//
|
||||
if (pbVblBar_OUT != NULL)
|
||||
{
|
||||
if (v_4 & v_3) // VBL?
|
||||
{
|
||||
*pbVblBar_OUT = false; // Y: VBL' is false
|
||||
}
|
||||
else
|
||||
{
|
||||
*pbVblBar_OUT = true; // N: VBL' is true
|
||||
}
|
||||
}
|
||||
return static_cast<WORD>(nAddress);
|
||||
}
|
||||
|
||||
//===========================================================================
|
||||
|
||||
@ -32,6 +32,7 @@ void VideoRedrawScreen ();
|
||||
void VideoRefreshScreen ();
|
||||
void VideoReinitialize ();
|
||||
void VideoResetState ();
|
||||
WORD VideoGetScannerAddress(bool* pbVblBar_OUT = NULL);
|
||||
void VideoUpdateVbl (DWORD dwCyclesThisFrame);
|
||||
void VideoUpdateFlash();
|
||||
bool VideoGetSW80COL();
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user