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VDP timing improvements

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This commit is contained in:
kub 2020-01-26 20:46:21 +01:00
parent 2d5b6a66c1
commit 1259ac4f60
4 changed files with 11 additions and 9 deletions
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10
pico/videoport.c
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@ -376,12 +376,12 @@ PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
pvid->pending=0;
}
if (!(pvid->status & SR_VB) && !(PicoIn.opt&POPT_DIS_VDP_FIFO))
if (!(pvid->status & SR_VB) && (pvid->reg[1]&0x40) && !(PicoIn.opt&POPT_DIS_VDP_FIFO))
{
int use = pvid->type == 1 ? 2 : 1;
pvid->lwrite_cnt -= use;
if (pvid->lwrite_cnt < 0)
SekCyclesLeft = 0;
SekCyclesBurnRun(488 - (SekCyclesDone()-Pico.t.m68c_line_start));
elprintf(EL_ASVDP, "VDP data write: [%04x] %04x [%u] {%i} #%i @ %06x",
Pico.video.addr, d, SekCyclesDone(), Pico.video.type, pvid->lwrite_cnt, SekPc);
}
@ -509,9 +509,11 @@ static u32 SrLow(const struct PicoVideo *pv)
{
unsigned int c, d = pv->status;
c = SekCyclesDone() - Pico.t.m68c_line_start - 39;
if (c < 92)
c = SekCyclesDone();
if (c - Pico.t.m68c_line_start - 39 < 92)
d |= SR_HB;
if (CYCLES_GT(c, Pico.t.dma_end))
d &= ~SR_DMA;
return d;
}