Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-21 21:29:15 +03:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity

z80dma: Added Initiate read sequence command and hooked up basic status reading

Browse Source
This commit is contained in:
Angelo Salese 2009-09-16 21:13:31 +00:00
parent f0f42d6f45
commit 07e5aa6ebb
1 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/emu/machine/z80dma.c
View File

@ -97,6 +97,9 @@ struct _z80dma_t
UINT8 num_follow;
UINT8 cur_follow;
UINT8 regs_follow[4];
UINT8 read_num_follow;
UINT8 read_cur_follow;
UINT8 read_regs_follow[7];
UINT8 status;
UINT8 dma_enabled;
@ -268,8 +271,16 @@ static void z80dma_update_status(const device_config *device)
READ8_DEVICE_HANDLER( z80dma_r )
{
fatalerror("z80dma_read: not implemented");
return 0;
z80dma_t *cntx = get_safe_token(device);
UINT8 res;
res = cntx->read_regs_follow[cntx->read_cur_follow];
cntx->read_cur_follow++;
if(cntx->read_cur_follow >= cntx->read_num_follow)
cntx->read_cur_follow = 0;
return res;
}
@ -331,7 +342,6 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
{
case 0x88: /* Reinitialize status byte */
case 0xA3: /* Reset and disable interrupts */
case 0xA7: /* Initiate read sequence */
case 0xAB: /* Enable interrupts */
case 0xAF: /* Disable interrupts */
case 0xB3: /* Force ready */
@ -340,6 +350,16 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
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)
break;
case 0xC3: /* Reset */
LOG(("Reset\n"));
break;
@ -402,7 +422,7 @@ static TIMER_CALLBACK( z80dma_rdy_write_callback )
}
WRITE8_DEVICE_HANDLER( z80dma_rdy_w)
WRITE8_DEVICE_HANDLER( z80dma_rdy_w )
{
z80dma_t *z80dma = get_safe_token(device);
int param;
@ -477,6 +497,7 @@ static DEVICE_RESET( z80dma )
z80dma->rdy = 0;
z80dma->num_follow = 0;
z80dma->dma_enabled = 0;
z80dma->read_num_follow = z80dma->read_cur_follow = 0;
z80dma_update_status(device);
}