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Added random busy signal on dsp write port

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Added command 0xda, exit autoinitialize 8-bit.


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@763
This commit is contained in:
Sjoerd van der Berg 2003-03-13 21:50:27 +00:00
parent 5bf4faa828
commit 02784e988b
1 changed files with 8 additions and 0 deletions
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8
src/hardware/sblaster.cpp
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@ -98,6 +98,7 @@ struct SB_INFO {
Bitu pos,used;
} in,out;
Bit8u test_register;
Bitu write_busy;
} dsp;
struct {
Bit16s data[DSP_DACSIZE];
@ -434,6 +435,7 @@ static void DSP_Reset(void) {
DSP_ChangeMode(MODE_NONE);
sb.dsp.cmd_len=0;
sb.dsp.in.pos=0;
sb.dsp.write_busy=0;
sb.dma.left=0;
sb.dma.total=0;
sb.freq=22050;
@ -521,6 +523,10 @@ static void DSP_DoCommand(void) {
DSP_ChangeMode(MODE_DMA_WAIT);
DMA_SetEnableCallBack(sb.hw.dma8,DMA_Enable);
break;
case 0xda: /* Exit Autoinitialize 8-bit */
/* Set mode to single transfer so it ends with current block */
if (sb.dma.mode==DMA_8_AUTO) sb.dma.mode=DMA_8_SINGLE;
break;
case 0xe0: /* DSP Identification - SB2.0+ */
DSP_FlushData();
DSP_AddData(~sb.dsp.in.data[0]);
@ -640,6 +646,8 @@ static Bit8u read_sb(Bit32u port) {
case DSP_WRITE_STATUS:
switch (sb.dsp.state) {
case DSP_S_NORMAL:
sb.dsp.write_busy++;
if (sb.dsp.write_busy & 8) return 0xff;
return 0x7f;
case DSP_S_RESET:
return 0xff;