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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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3
pico/pico.c
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@ -254,7 +254,7 @@ PICO_INTERNAL int CheckDMA(int cycles)
dma_op1 = dma_op;
if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
xfers_can = (dma_timings[dma_op] * cycles + 0xff) >> 16;
xfers_can = (dma_timings[dma_op] * cycles + 0x8000) >> 16;
if(xfers <= xfers_can)
{
Pico.video.status &= ~SR_DMA;
@ -265,6 +265,7 @@ PICO_INTERNAL int CheckDMA(int cycles)
if(!(dma_op&2)) burn = cycles;
Pico.m.dma_xfers -= xfers_can;
}
Pico.t.dma_end = SekCyclesDone() + burn;
elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%u]",
Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());