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z80dma: Added continue and reset port A/B timing commands

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This commit is contained in:
Angelo Salese 2009-09-16 21:33:40 +00:00
parent 07e5aa6ebb
commit 3c7799d14d
1 changed files with 17 additions and 7 deletions
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24
src/emu/machine/z80dma.c
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@ -347,18 +347,17 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
case 0xB3: /* Force ready */
case 0xB7: /* Enable after rti */
case 0xBF: /* Read status byte */
case 0xD3: /* Continue */
fatalerror("Unimplemented WR6 command %02x", data);
break;
case 0xA7: /* Initiate read sequence */
cntx->read_cur_follow = cntx->read_num_follow = 0;
if(READ_MASK(cntx) & 0x01) { cntx->read_regs_follow[cntx->read_num_follow++] = cntx->status; }
if(READ_MASK(cntx) & 0x02) { cntx->read_regs_follow[cntx->read_num_follow++] = cntx->count & 0xff; } //byte counter (low)
if(READ_MASK(cntx) & 0x04) { cntx->read_regs_follow[cntx->read_num_follow++] = (cntx->count >> 8) & 0xff; } //byte counter (high)
if(READ_MASK(cntx) & 0x08) { cntx->read_regs_follow[cntx->read_num_follow++] = cntx->addressA & 0xff; } //port A address (low)
if(READ_MASK(cntx) & 0x10) { cntx->read_regs_follow[cntx->read_num_follow++] = (cntx->addressA >> 8) & 0xff; } //port A address (high)
if(READ_MASK(cntx) & 0x20) { cntx->read_regs_follow[cntx->read_num_follow++] = cntx->addressB & 0xff; } //port B address (low)
if(READ_MASK(cntx) & 0x40) { cntx->read_regs_follow[cntx->read_num_follow++] = (cntx->addressB >> 8) & 0xff; } //port B address (high)
if(READ_MASK(cntx) & 0x02) { cntx->read_regs_follow[cntx->read_num_follow++] = GET_REGNUM(cntx, BLOCKLEN_L(cntx)); } //byte counter (low)
if(READ_MASK(cntx) & 0x04) { cntx->read_regs_follow[cntx->read_num_follow++] = GET_REGNUM(cntx, BLOCKLEN_H(cntx)); } //byte counter (high)
if(READ_MASK(cntx) & 0x08) { cntx->read_regs_follow[cntx->read_num_follow++] = GET_REGNUM(cntx, PORTA_ADDRESS_L(cntx)); } //port A address (low)
if(READ_MASK(cntx) & 0x10) { cntx->read_regs_follow[cntx->read_num_follow++] = GET_REGNUM(cntx, PORTA_ADDRESS_H(cntx)); } //port A address (high)
if(READ_MASK(cntx) & 0x20) { cntx->read_regs_follow[cntx->read_num_follow++] = GET_REGNUM(cntx, PORTB_ADDRESS_L(cntx)); } //port B address (low)
if(READ_MASK(cntx) & 0x40) { cntx->read_regs_follow[cntx->read_num_follow++] = GET_REGNUM(cntx, PORTA_ADDRESS_H(cntx)); } //port B address (high)
break;
case 0xC3: /* Reset */
LOG(("Reset\n"));
@ -380,6 +379,17 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
case 0xBB:
cntx->regs_follow[cntx->num_follow++] = GET_REGNUM(cntx, READ_MASK(cntx));
break;
case 0xD3: /* Continue */
cntx->count = 0;
cntx->dma_enabled = 1;
//FIXME: "mach" & "endb" flags should be zeroed here
break;
case 0xc7: /* Reset Port A Timing */
PORTA_TIMING(cntx) = 0;
break;
case 0xcb: /* Reset Port B Timing */
PORTB_TIMING(cntx) = 0;
break;
default:
fatalerror("Unknown WR6 command %02x", data);
}