Mercurial > repos > blastem
diff vdp.c @ 135:a81c548cf353
Fix 68K->VDP DMA
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 30 Dec 2012 11:54:25 -0800 |
| parents | 8fc8e46be691 |
| children | 0e7e1ccc0a81 |
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--- a/vdp.c Sun Dec 30 09:55:18 2012 -0800 +++ b/vdp.c Sun Dec 30 11:54:25 2012 -0800 @@ -225,7 +225,6 @@ context->vdpmem[context->address ^ 1] = context->dma_val >> 8; context->flags &= ~FLAG_DMA_PROG; } else { - context->dma_val = read_dma_value((context->regs[REG_DMASRC_H] << 16) | (context->regs[REG_DMASRC_M] << 8) | context->regs[REG_DMASRC_L]); context->vdpmem[context->address] = context->dma_val; context->flags |= FLAG_DMA_PROG; } @@ -284,6 +283,9 @@ if (!(context->flags & FLAG_DMA_PROG)) { context->address += context->regs[REG_AUTOINC]; context->regs[REG_DMASRC_L] += 1; + if (!context->regs[REG_DMASRC_L]) { + context->regs[REG_DMASRC_M] += 1; + } dma_len = ((context->regs[REG_DMALEN_H] << 8) | context->regs[REG_DMALEN_L]) - 1; context->regs[REG_DMALEN_H] = dma_len >> 8; context->regs[REG_DMALEN_L] = dma_len;