u32 z80ReadBusReq(void)
{
u32 d=Pico.m.z80Run&1;
- if (!d && Pico.m.scanline != -1) {
+ if (!d) {
// needed by buggy Terminator (Sega CD)
int stop_before = SekCyclesDone() - z80stopCycle;
//elprintf(EL_BUSREQ, "get_zrun: stop before: %i", stop_before);
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;
}
-#ifndef _ASM_MEMORY_C
-static
-#endif
-void z80WriteBusReq(u32 d)
+static void z80WriteBusReq(u32 d)
+{
+ d&=1; d^=1;
+ elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
+ if (d ^ Pico.m.z80Run)
+ {
+ if (d)
+ {
+ z80_cycle_cnt = cycles_68k_to_z80(SekCyclesDone());
+ }
+ else
+ {
+ z80stopCycle = SekCyclesDone();
+ if ((PicoOpt&POPT_EN_Z80) && !Pico.m.z80_reset)
+ PicoSyncZ80(z80stopCycle);
+ }
+ Pico.m.z80Run=d;
+ }
+}
+
+static void z80WriteReset(u32 d)
{
d&=1; d^=1;
+ elprintf(EL_BUSREQ, "set_zreset: %i->%i [%i] @%06x", Pico.m.z80_reset, d, SekCyclesDone(), SekPc);
+ if (d ^ Pico.m.z80_reset)
{
- if (!d)
+ if (d)
{
- // this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
if ((PicoOpt&POPT_EN_Z80) && 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;
+ PicoSyncZ80(SekCyclesDone());
}
+ else
+ {
+ z80_cycle_cnt = cycles_68k_to_z80(SekCyclesDone());
+ z80_reset();
+ }
+ YM2612ResetChip();
+ timers_reset();
+ Pico.m.z80_reset=d;
}
- elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
- Pico.m.z80Run=(u8)d;
}
#ifndef _ASM_MEMORY_C
if (Pico.m.z80Run&1)
elprintf(EL_ANOMALY, "68k z80 read with no bus! [%06x] @ %06x", a, SekPc);
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&POPT_EN_FM) d=YM2612Read();
- else d=Pico.m.rotate++&3;
- elprintf(EL_YM2612R, "read ym2612: %02x", d);
- goto end;
- }
+ if ((a&0x6000)==0x4000) { d=ym2612_read_local_68k(); goto end; } // 0x4000-0x5fff
+
elprintf(EL_ANOMALY, "68k bad read [%06x]", a);
d=0xffff;
goto end;
#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) { // z80 RAM
- if (!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d;
- else {
- elprintf(EL_ANOMALY, "68k z80 write with no bus! [%06x] %02x @ %06x", a, d, SekPc);
- SekCyclesBurn(4); // hack?
- }
+ SekCyclesBurn(2); // hack
+ if (!(Pico.m.z80Run&1) && !Pico.m.z80_reset) Pico.zram[a&0x1fff]=(u8)d;
+ else elprintf(EL_ANOMALY, "68k z80 write with no bus or reset! [%06x] %02x @ %06x", a, d&0xff, SekPc);
return;
}
- if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d)&1; return; } // FM Sound
+ if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=ym2612_write_local(a&3, d&0xff, 0)&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) {
- elprintf(EL_BUSREQ, "write z80Reset: %02x", d);
- if (!(d&0x1)) { Pico.m.z80_reset = 1; Pico.m.z80Run = 0; YM2612ResetChip(); }
- else if (Pico.m.z80_reset) {
- Pico.m.z80_reset = 0;
- YM2612ResetChip();
- z80_reset();
- }
- return;
- }
+ if (a==0xa11200) { z80WriteReset(d); return; }
+
#if !defined(_ASM_MEMORY_C) || defined(_ASM_MEMORY_C_AMIPS)
if ((a&0xff7f00)==0xa06000) // Z80 BANK register
{
return;
}
- PicoWrite8Hook(a, d, 8);
+ PicoWrite8Hook(a, d&0xff, 8);
}
if (a==0xa11100) { z80WriteBusReq(d>>8); return; }
if ((a&0xffffe0)==0xa10000) { IoWrite8(a, d); return; } // I/O ports
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&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=ym2612_write_local(a&3, d&0xff, 0)&1; return; } // FM Sound
if ((a&0xff4000)==0xa00000) { // Z80 ram (MSB only)
- if (!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8);
- else elprintf(EL_ANOMALY, "68k z80 write with no bus! [%06x] %02x @ %06x", a, d, SekPc);
- return;
- }
- if (a==0xa11200) {
- elprintf(EL_BUSREQ, "write z80reset: %04x", d);
- if (!(d&0x100)) { Pico.m.z80_reset = 1; Pico.m.z80Run = 0; YM2612ResetChip(); }
- else if (Pico.m.z80_reset) {
- Pico.m.z80_reset = 0;
- YM2612ResetChip();
- z80_reset();
- }
+ if (!(Pico.m.z80Run&1) && !Pico.m.z80_reset) Pico.zram[a&0x1fff]=(u8)(d>>8);
+ else elprintf(EL_ANOMALY, "68k z80 write with no bus or reset! [%06x] %04x @ %06x", a, d&0xffff, SekPc);
return;
}
+ if (a==0xa11200) { z80WriteReset(d>>8); return; }
+
if ((a&0xff7f00)==0xa06000) // Z80 BANK register
{
Pico.m.z80_bank68k>>=1;
}
#endif
- PicoWrite16Hook(a, d, 16);
+ PicoWrite16Hook(a, d&0xffff, 16);
}