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vdp timing hacks

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This commit is contained in:
notaz 2017-10-04 02:58:48 +03:00
parent 3162a7104c
commit 334f00e24e
2 changed files with 28 additions and 18 deletions
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12
pico/videoport.c
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@ -377,14 +377,12 @@ PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
}
// preliminary FIFO emulation for Chaos Engine, The (E)
if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?
if (!(pvid->status & SR_VB) && (pvid->reg[1] & 0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?
{
pvid->status&=~0x200; // FIFO no longer empty
pvid->lwrite_cnt++;
if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full
if (pvid->lwrite_cnt > 4) {
SekCyclesBurnRun(32); // penalty // 488/12-8
}
int use = pvid->type == 1 ? 2 : 1;
pvid->lwrite_cnt -= use;
if (pvid->lwrite_cnt < 0)
SekCyclesLeft = 0;
elprintf(EL_ASVDP, "VDP data write: %04x [%06x] {%i} #%i @ %06x", d, Pico.video.addr,
Pico.video.type, pvid->lwrite_cnt, SekPc);
}