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z80dma: implemented fixed port transfer behaviour.

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This commit is contained in:
Angelo Salese 2009-09-19 16:09:36 +00:00
parent d2182ce269
commit e2f3522bc2
1 changed files with 7 additions and 4 deletions
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11
src/emu/machine/z80dma.c
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@ -142,7 +142,7 @@ static void z80dma_do_read(const device_config *device)
cntx->latch = cntx->intf->memory_read(device, cntx->addressA);
else
cntx->latch = cntx->intf->portA_read(device, cntx->addressA);
cntx->addressA += PORTA_STEP(cntx);
cntx->addressA += PORTA_FIXED(cntx) ? 0 : PORTA_STEP(cntx);
}
else
{
@ -150,7 +150,8 @@ static void z80dma_do_read(const device_config *device)
cntx->latch = cntx->intf->memory_read(device, cntx->addressB);
else
cntx->latch = cntx->intf->portB_read(device, cntx->addressB);
cntx->addressB += PORTB_STEP(cntx);
cntx->addressB += PORTB_FIXED(cntx) ? 0 : PORTB_STEP(cntx);
}
break;
case TM_SEARCH:
@ -184,7 +185,8 @@ static int z80dma_do_write(const device_config *device)
cntx->intf->memory_write(device, cntx->addressB, cntx->latch);
else
cntx->intf->portB_write(device, cntx->addressB, cntx->latch);
cntx->addressB += PORTB_STEP(cntx);
cntx->addressB += PORTB_FIXED(cntx) ? 0 : PORTB_STEP(cntx);
}
else
{
@ -192,7 +194,8 @@ static int z80dma_do_write(const device_config *device)
cntx->intf->memory_write(device, cntx->addressA, cntx->latch);
else
cntx->intf->portB_write(device, cntx->addressA, cntx->latch);
cntx->addressA += PORTA_STEP(cntx);
cntx->addressA += PORTA_FIXED(cntx) ? 0 : PORTA_STEP(cntx);
}
cntx->count--;
done = (cntx->count == 0xFFFF);