diff options
Diffstat (limited to 'vdp.c')
| -rw-r--r-- | vdp.c | 22 |
1 files changed, 5 insertions, 17 deletions
@@ -455,6 +455,7 @@ void run_dma_src(vdp_context * context, uint32_t slot) uint16_t read_val; uint8_t ran_source = 0, partial = 0; uint16_t dma_len; + uint8_t cd = context->cd; switch(context->regs[REG_DMASRC_H] & 0xC0) { //68K -> VDP @@ -468,22 +469,9 @@ void run_dma_src(vdp_context * context, uint32_t slot) //Copy case 0xC0: if (context->flags & FLAG_UNUSED_SLOT) { - switch(context->dma_cd & 0xF) - { - case VRAM_WRITE: - read_val = context->vdpmem[(context->regs[REG_DMASRC_M] << 8) | context->regs[REG_DMASRC_L]]; - break; - case CRAM_WRITE: - read_val = context->cram[context->regs[REG_DMASRC_L] & (CRAM_SIZE-1)]; - break; - case VSRAM_WRITE: - if ((context->regs[REG_DMASRC_L] & 63) < VSRAM_SIZE) { - read_val = context->vsram[context->regs[REG_DMASRC_L] & 63]; - } else { - read_val = 0; - } - break; - } + read_val = context->vdpmem[(context->regs[REG_DMASRC_M] << 8) | context->regs[REG_DMASRC_L] ^ 1] | (context->fifo[context->fifo_write].value & 0xFF00); + cd = VRAM_WRITE; + partial = 1; ran_source = 1; context->flags &= ~FLAG_UNUSED_SLOT; } @@ -500,7 +488,7 @@ void run_dma_src(vdp_context * context, uint32_t slot) cur->cycle = context->cycles + ((context->latched_mode & BIT_H40) ? 16 : 20)*FIFO_LATENCY; cur->address = context->address; cur->value = read_val; - cur->cd = context->cd; + cur->cd = cd; cur->partial = partial; if (context->fifo_read < 0) { context->fifo_read = context->fifo_write; |