static void OtherWrite8End(u32 a,u32 d,int realsize);
#endif
-static int PadRead(int i)
-{
- int pad=0,value=0,TH;
- pad=~PicoPad[i]; // Get inverse of pad MXYZ SACB RLDU
- TH=Pico.ioports[i+1]&0x40;
-
- if(PicoOpt & 0x20) { // 6 button gamepad enabled
- int phase = Pico.m.padTHPhase[i];
-
- if(phase == 2 && !TH) {
- value=(pad&0xc0)>>2; // ?0SA 0000
- goto end;
- } else if(phase == 3 && TH) {
- value=(pad&0x30)|((pad>>8)&0xf); // ?1CB MXYZ
- goto end;
- } else if(phase == 3 && !TH) {
- value=((pad&0xc0)>>2)|0x0f; // ?0SA 1111
- goto end;
- }
- }
-
- if(TH) value=(pad&0x3f); // ?1CB RLDU
- else value=((pad&0xc0)>>2)|(pad&3); // ?0SA 00DU
-
- end:
-
- // orr the bits, which are set as output
- value |= Pico.ioports[i+1]&Pico.ioports[i+4];
-
- return value; // will mirror later
-}
-
#ifndef _ASM_MEMORY_C
static
return Pico.zram[a];
}
-
#ifndef _ASM_MEMORY_C
static
#endif
-u32 OtherRead16(u32 a, int realsize)
+u32 z80ReadBusReq(void)
{
- u32 d=0;
+ u32 d=Pico.m.z80Run&1;
+ if (!d && Pico.m.scanline != -1) {
+ // needed by buggy Terminator (Sega CD)
+ int stop_before = SekCyclesDone() - z80stopCycle;
+ //elprintf(EL_BUSREQ, "get_zrun: stop before: %i", stop_before);
+ // note: if we use 20 or more here, Barkley Shut Up and Jam! will purposedly crash itself.
+ // but CD Terminator needs at least 32, so it only works because next frame cycle wrap.
+ if (stop_before > 0 && stop_before < 20) // Gens uses 16 here
+ d = 1; // bus not yet available
+ }
+ // |=0x80 for Shadow of the Beast & Super Offroad
+ elprintf(EL_BUSREQ, "get_zrun: %02x [%i] @%06x", d|0x80, SekCyclesDone(), SekPc);
+ return d|0x80;
+}
- if ((a&0xff0000)==0xa00000) {
- if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)
- if ((a&0x6000)==0x4000) { // 0x4000-0x5fff, Fudge if disabled
- if(PicoOpt&1) d=YM2612Read();
- else d=Pico.m.rotate++&3;
- dprintf("read ym2612: %04x", d);
- goto end;
+#ifndef _ASM_MEMORY_C
+static
+#endif
+void z80WriteBusReq(u32 d)
+{
+ d&=1; d^=1;
+ {
+ if (!d)
+ {
+ // this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
+ if (Pico.m.z80Run) {
+ int lineCycles;
+ z80stopCycle = SekCyclesDone();
+ if ((Pico.m.z80Run&2) && Pico.m.scanline != -1)
+ lineCycles=(488-SekCyclesLeft)&0x1ff;
+ else lineCycles=z80stopCycle-z80startCycle; // z80 was started at current line
+ if (lineCycles > 0) { // && lineCycles <= 488) {
+ //dprintf("zrun: %i/%i cycles", lineCycles, (lineCycles>>1)-(lineCycles>>5));
+ lineCycles=(lineCycles>>1)-(lineCycles>>5);
+ z80_run_nr(lineCycles);
+ }
+ }
+ } else {
+ if (!Pico.m.z80Run)
+ z80startCycle = SekCyclesDone();
+ else
+ d|=Pico.m.z80Run;
}
- d=0xffff;
- goto end;
}
+ elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
+ Pico.m.z80Run=(u8)d;
+}
+
+#ifndef _ASM_MEMORY_C
+static
+#endif
+u32 OtherRead16(u32 a, int realsize)
+{
+ u32 d=0;
if ((a&0xffffe0)==0xa10000) { // I/O ports
a=(a>>1)&0xf;
switch(a) {
case 0: d=Pico.m.hardware; break; // Hardware value (Version register)
- case 1: d=PadRead(0); d|=Pico.ioports[1]&0x80; break;
- case 2: d=PadRead(1); d|=Pico.ioports[2]&0x80; break;
+ case 1: d=PadRead(0); break;
+ case 2: d=PadRead(1); break;
default: d=Pico.ioports[a]; break; // IO ports can be used as RAM
}
d|=d<<8;
goto end;
}
- // |=0x80 for Shadow of the Beast & Super Offroad; rotate fakes next fetched instruction for Time Killers
+ // rotate fakes next fetched instruction for Time Killers
if (a==0xa11100) { // z80 busreq
- d=Pico.m.z80Run&1;
-#if 1
- if (!d) {
- // needed by buggy Terminator (Sega CD)
- int stop_before = SekCyclesDone() - z80stopCycle;
- dprintf("stop before: %i", stop_before);
- if (stop_before > 0 && stop_before <= 32) // Gens uses 16 here
- d = 1; // bus not yet available
- }
-#endif
- d=(d<<8)|0x8000|Pico.m.rotate++;
- dprintf("get_zrun: %04x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), SekPc);
+ d=(z80ReadBusReq()<<8)|Pico.m.rotate++;
goto end;
}
-#ifndef _ASM_MEMORY_C
- if ((a&0xe700e0)==0xc00000) { d=PicoVideoRead(a); goto end; }
-#endif
+ if ((a&0xff0000)==0xa00000) {
+ if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)
+ if ((a&0x6000)==0x4000) { // 0x4000-0x5fff, Fudge if disabled
+ if(PicoOpt&1) d=YM2612Read();
+ else d=Pico.m.rotate++&3;
+ elprintf(EL_YM2612R, "read ym2612: %02x", d);
+ goto end;
+ }
+ d=0xffff;
+ goto end;
+ }
- d = OtherRead16End(a, realsize);
+ d = PicoRead16Hook(a, realsize);
end:
return d;
}
-
-//extern UINT32 mz80GetRegisterValue(void *, UINT32);
+static void IoWrite8(u32 a, u32 d)
+{
+ a=(a>>1)&0xf;
+ // 6 button gamepad: if TH went from 0 to 1, gamepad changes state
+ if(PicoOpt&0x20) {
+ if(a==1) {
+ Pico.m.padDelay[0] = 0;
+ if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
+ }
+ else if(a==2) {
+ Pico.m.padDelay[1] = 0;
+ if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
+ }
+ }
+ Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
+}
#ifndef _ASM_CD_MEMORY_C
static
#endif
-void OtherWrite8(u32 a,u32 d,int realsize)
+void OtherWrite8(u32 a,u32 d)
{
+#if !defined(_ASM_MEMORY_C) || defined(_ASM_MEMORY_C_AMIPS)
if ((a&0xe700f9)==0xc00011||(a&0xff7ff9)==0xa07f11) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound
if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d; return; } // Z80 ram
- if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d); return; } // FM Sound
- if ((a&0xffffe0)==0xa10000) { // I/O ports
- a=(a>>1)&0xf;
- // 6 button gamepad: if TH went from 0 to 1, gamepad changes state
- if(PicoOpt&0x20) {
- if(a==1) {
- Pico.m.padDelay[0] = 0;
- if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
- }
- else if(a==2) {
- Pico.m.padDelay[1] = 0;
- if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
- }
- }
- Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
- return;
- }
- if (a==0xa11100) {
- //int lineCycles=(488-SekCyclesLeft)&0x1ff;
- d&=1; d^=1;
- if(!d) {
- // this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
- if (Pico.m.z80Run) {
- int lineCycles;
- z80stopCycle = SekCyclesDone();
- if (Pico.m.z80Run&2)
- lineCycles=(488-SekCyclesLeft)&0x1ff;
- else lineCycles=z80stopCycle-z80startCycle; // z80 was started at current line
- if (lineCycles > 0 && lineCycles <= 488) {
- dprintf("zrun: %i/%i cycles", lineCycles, (lineCycles>>1)-(lineCycles>>5));
- lineCycles=(lineCycles>>1)-(lineCycles>>5);
- z80_run(lineCycles);
- }
- }
- } else {
- z80startCycle = SekCyclesDone();
- //if(Pico.m.scanline != -1)
- }
- dprintf("set_zrun: %02x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), /*mz80GetRegisterValue(NULL, 0),*/ SekPc);
- Pico.m.z80Run=(u8)d; return;
- }
+ if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d)&1; return; } // FM Sound
+ if ((a&0xffffe0)==0xa10000) { IoWrite8(a, d); return; } // I/O ports
+#endif
+ if (a==0xa11100) { z80WriteBusReq(d); return; }
if (a==0xa11200) {
- dprintf("write z80Reset: %02x", d);
+ elprintf(EL_BUSREQ, "write z80Reset: %02x", d);
if(!(d&1)) z80_reset();
return;
}
-
+#if !defined(_ASM_MEMORY_C) || defined(_ASM_MEMORY_C_AMIPS)
if ((a&0xff7f00)==0xa06000) // Z80 BANK register
{
Pico.m.z80_bank68k>>=1;
Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
return;
}
-
+#endif
if ((a&0xe700e0)==0xc00000) {
+ d&=0xff;
PicoVideoWrite(a,(u16)(d|(d<<8))); // Byte access gets mirrored
return;
}
- OtherWrite8End(a, d, realsize);
+ PicoWrite8Hook(a, d, 8);
}
#endif
void OtherWrite16(u32 a,u32 d)
{
- if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; }
+ if (a==0xa11100) { z80WriteBusReq(d>>8); return; }
+ if (a==0xa11200) { elprintf(EL_BUSREQ, "write z80reset: %04x", d); if(!(d&0x100)) z80_reset(); return; }
+ if ((a&0xffffe0)==0xa10000) { IoWrite8(a, d); return; } // I/O ports
if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8); return; } // Z80 ram (MSB only)
+ if ((a&0xe700f8)==0xc00010||(a&0xff7ff8)==0xa07f10) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound
+ if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d)&1; return; } // FM Sound (??)
+ if ((a&0xff7f00)==0xa06000) // Z80 BANK register
+ {
+ Pico.m.z80_bank68k>>=1;
+ Pico.m.z80_bank68k|=(d&1)<<8;
+ Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
+ return;
+ }
- if ((a&0xffffe0)==0xa10000) { // I/O ports
- a=(a>>1)&0xf;
- // 6 button gamepad: if TH went from 0 to 1, gamepad changes state
- if(PicoOpt&0x20) {
- if(a==1) {
- Pico.m.padDelay[0] = 0;
- if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
- }
- else if(a==2) {
- Pico.m.padDelay[1] = 0;
- if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
- }
+#ifndef _CD_MEMORY_C
+ if (a >= SRam.start && a <= SRam.end) {
+ elprintf(EL_SRAMIO, "sram w16 [%06x] %04x @ %06x", a, d, SekPc);
+ if ((Pico.m.sram_reg&0x16)==0x10) { // detected, not EEPROM, write not disabled
+ u8 *pm=(u8 *)(SRam.data-SRam.start+a);
+ *pm++=d>>8;
+ *pm++=d;
+ SRam.changed = 1;
}
- Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
+ else
+ SRAMWrite(a, d);
return;
}
- if (a==0xa11100) { OtherWrite8(a, d>>8, 16); return; }
- if (a==0xa11200) { dprintf("write z80reset: %04x", d); if(!(d&0x100)) z80_reset(); return; }
+#endif
- OtherWrite8(a, d>>8, 16);
- OtherWrite8(a+1,d&0xff, 16);
+ PicoWrite8Hook(a, d>>8, 16);
+ PicoWrite8Hook(a+1,d&0xff, 16);
}
notaz.gp2x.de / picodrive.git / blobdiff