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new acc mode timing, VDP FIFO code

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@244 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-09-11 20:52:21 +00:00
parent 83c093a48a
commit 69996cb7c6
14 changed files with 373 additions and 132 deletions
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28
Pico/MemoryCmn.c
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@ -55,11 +55,14 @@ u32 z80ReadBusReq(void)
if (!d && Pico.m.scanline != -1) {
// 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
//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.
// TODO: CD Terminator
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;
}
@ -69,7 +72,7 @@ static
void z80WriteBusReq(u32 d)
{
d&=1; d^=1;
if(Pico.m.scanline != -1)
if (Pico.m.scanline != -1)
{
if(!d) {
// this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
@ -80,16 +83,19 @@ void z80WriteBusReq(u32 d)
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));
//dprintf("zrun: %i/%i cycles", lineCycles, (lineCycles>>1)-(lineCycles>>5));
lineCycles=(lineCycles>>1)-(lineCycles>>5);
z80_run(lineCycles);
}
}
} else {
z80startCycle = SekCyclesDone();
if (!Pico.m.z80Run)
z80startCycle = SekCyclesDone();
else
d|=Pico.m.z80Run;
}
}
dprintf("set_zrun: %02x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), /*mz80GetRegisterValue(NULL, 0),*/ SekPc);
elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
Pico.m.z80Run=(u8)d;
}
@ -115,7 +121,6 @@ u32 OtherRead16(u32 a, int realsize)
// rotate fakes next fetched instruction for Time Killers
if (a==0xa11100) { // z80 busreq
d=(z80ReadBusReq()<<8)|Pico.m.rotate++;
dprintf("get_zrun: %04x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), SekPc);
goto end;
}
@ -124,7 +129,7 @@ u32 OtherRead16(u32 a, int realsize)
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);
elprintf(EL_YM2612R, "read ym2612: %02x", d);
goto end;
}
d=0xffff;
@ -214,6 +219,7 @@ void OtherWrite16(u32 a,u32 d)
return;
}
#ifndef _CD_MEMORY_C
if (a >= SRam.start && a <= SRam.end) {
if ((a&0x16)==0x10) { // detected, not EEPROM, write not disabled
u8 *pm=(u8 *)(SRam.data-SRam.start+a);
@ -225,8 +231,10 @@ void OtherWrite16(u32 a,u32 d)
SRAMWrite(a, d); // ??
return;
}
//OtherWrite8End(a, d>>8, 16);
//OtherWrite8End(a+1,d&0xff, 16);
#else
OtherWrite8End(a, d>>8, 16);
OtherWrite8End(a+1,d&0xff, 16);
#endif
}