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https://github.com/RaySollium99/picodrive.git
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runs code in 1M wram, cell arrange, decode (untested)
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@54 be3aeb3a-fb24-0410-a615-afba39da0efa
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notaz
parent
3a81ecde1c
commit
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16 changed files with 787 additions and 551 deletions
187
Pico/Memory.c
187
Pico/Memory.c
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@ -107,71 +107,12 @@ static int SRAMRead(u32 a)
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}
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#endif
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static int PadRead(int i)
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{
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int pad=0,value=0,TH;
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pad=~PicoPad[i]; // Get inverse of pad MXYZ SACB RLDU
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TH=Pico.ioports[i+1]&0x40;
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if(PicoOpt & 0x20) { // 6 button gamepad enabled
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int phase = Pico.m.padTHPhase[i];
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if(phase == 2 && !TH) {
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value=(pad&0xc0)>>2; // ?0SA 0000
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goto end;
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} else if(phase == 3 && TH) {
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value=(pad&0x30)|((pad>>8)&0xf); // ?1CB MXYZ
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goto end;
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} else if(phase == 3 && !TH) {
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value=((pad&0xc0)>>2)|0x0f; // ?0SA 1111
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goto end;
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}
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}
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if(TH) value=(pad&0x3f); // ?1CB RLDU
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else value=((pad&0xc0)>>2)|(pad&3); // ?0SA 00DU
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end:
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// orr the bits, which are set as output
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value |= Pico.ioports[i+1]&Pico.ioports[i+4];
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return value; // will mirror later
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}
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u8 z80Read8(u32 a)
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{
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if(Pico.m.z80Run&1) return 0;
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a&=0x1fff;
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if(!(PicoOpt&4)) {
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// Z80 disabled, do some faking
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static u8 zerosent = 0;
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if(a == Pico.m.z80_lastaddr) { // probably polling something
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u8 d = Pico.m.z80_fakeval;
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if((d & 0xf) == 0xf && !zerosent) {
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d = 0; zerosent = 1;
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} else {
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Pico.m.z80_fakeval++;
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zerosent = 0;
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}
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return d;
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} else {
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Pico.m.z80_fakeval = 0;
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}
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}
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Pico.m.z80_lastaddr = (u16) a;
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return Pico.zram[a];
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}
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// for nonstandard reads
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#ifndef _ASM_MEMORY_C
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static
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#endif
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u32 UnusualRead16(u32 a, int realsize)
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u32 OtherRead16End(u32 a, int realsize)
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{
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u32 d=0;
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@ -242,109 +183,11 @@ end:
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return d;
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}
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#ifndef _ASM_MEMORY_C
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static
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#endif
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u32 OtherRead16(u32 a, int realsize)
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{
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u32 d=0;
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if ((a&0xff0000)==0xa00000) {
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if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)
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if ((a&0x6000)==0x4000) { if(PicoOpt&1) d=YM2612Read(); else d=Pico.m.rotate++&3; dprintf("read ym2612: %04x", d); goto end; } // 0x4000-0x5fff, Fudge if disabled
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d=0xffff; goto end;
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}
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if ((a&0xffffe0)==0xa10000) { // I/O ports
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a=(a>>1)&0xf;
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switch(a) {
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case 0: d=Pico.m.hardware; break; // Hardware value (Version register)
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case 1: d=PadRead(0); d|=Pico.ioports[1]&0x80; break;
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case 2: d=PadRead(1); d|=Pico.ioports[2]&0x80; break;
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default: d=Pico.ioports[a]; break; // IO ports can be used as RAM
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}
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d|=d<<8;
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goto end;
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}
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// |=0x80 for Shadow of the Beast & Super Offroad; rotate fakes next fetched instruction for Time Killers
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if (a==0xa11100) {
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d=Pico.m.z80Run&1;
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#if 0
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if (!d) {
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// do we need this?
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extern int z80stopCycle; // TODO: tidy
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int stop_before = SekCyclesDone() - z80stopCycle;
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if (stop_before > 0 && stop_before <= 16) // Gens uses 16 here
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d = 1; // bus not yet available
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}
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#endif
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d=(d<<8)|0x8000|Pico.m.rotate++;
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dprintf("get_zrun: %04x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), SekPc);
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goto end; }
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#ifndef _ASM_MEMORY_C
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if ((a&0xe700e0)==0xc00000) { d=PicoVideoRead(a); goto end; }
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#endif
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d = UnusualRead16(a, realsize);
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end:
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return d;
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}
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//extern UINT32 mz80GetRegisterValue(void *, UINT32);
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static void OtherWrite8(u32 a,u32 d,int realsize)
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static void OtherWrite8End(u32 a,u32 d,int realsize)
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{
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if ((a&0xe700f9)==0xc00011||(a&0xff7ff9)==0xa07f11) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound
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if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d; return; } // Z80 ram
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if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d); return; } // FM Sound
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if ((a&0xffffe0)==0xa10000) { // I/O ports
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a=(a>>1)&0xf;
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// 6 button gamepad: if TH went from 0 to 1, gamepad changes state
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if(PicoOpt&0x20) {
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if(a==1) {
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Pico.m.padDelay[0] = 0;
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if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
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}
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else if(a==2) {
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Pico.m.padDelay[1] = 0;
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if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
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}
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}
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Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
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return;
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}
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if (a==0xa11100) {
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extern int z80startCycle, z80stopCycle;
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//int lineCycles=(488-SekCyclesLeft)&0x1ff;
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d&=1; d^=1;
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if(!d) {
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// this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
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if (Pico.m.z80Run) {
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int lineCycles=(488-SekCyclesLeft)&0x1ff;
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z80stopCycle = SekCyclesDone();
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lineCycles=(lineCycles>>1)-(lineCycles>>5);
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z80_run(lineCycles);
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}
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} else {
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z80startCycle = SekCyclesDone();
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//if(Pico.m.scanline != -1)
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}
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dprintf("set_zrun: %02x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), /*mz80GetRegisterValue(NULL, 0),*/ SekPc);
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Pico.m.z80Run=(u8)d; return;
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}
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if (a==0xa11200) { dprintf("write z80Reset: %02x", d); if(!(d&1)) z80_reset(); return; }
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if ((a&0xff7f00)==0xa06000) // Z80 BANK register
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{
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Pico.m.z80_bank68k>>=1;
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Pico.m.z80_bank68k|=(d&1)<<8;
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Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
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return;
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}
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if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)(d|(d<<8))); return; } // Byte access gets mirrored
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// sram
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//if(a==0x200000) dprintf("cc : %02x @ %06x [%i|%i]", d, SekPc, SekCyclesDoneT(), SekCyclesDone());
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//if(a==0x200001) dprintf("w8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());
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@ -408,33 +251,9 @@ static void OtherWrite8(u32 a,u32 d,int realsize)
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Pico.m.prot_bytes[(a>>2)&1] = (u8)d;
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}
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static void OtherWrite16(u32 a,u32 d)
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{
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if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; }
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if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8); return; } // Z80 ram (MSB only)
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if ((a&0xffffe0)==0xa10000) { // I/O ports
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a=(a>>1)&0xf;
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// 6 button gamepad: if TH went from 0 to 1, gamepad changes state
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if(PicoOpt&0x20) {
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if(a==1) {
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Pico.m.padDelay[0] = 0;
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if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
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}
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else if(a==2) {
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Pico.m.padDelay[1] = 0;
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if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
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}
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}
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Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
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return;
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}
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if (a==0xa11100) { OtherWrite8(a, d>>8, 16); return; }
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if (a==0xa11200) { dprintf("write z80reset: %04x", d); if(!(d&0x100)) z80_reset(); return; }
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#include "MemoryCmn.c"
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OtherWrite8(a, d>>8, 16);
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OtherWrite8(a+1,d&0xff, 16);
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}
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// -----------------------------------------------------------------
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// Read Rom and read Ram
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