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sblaster: DMA fixes for SB Pro and SB16

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This commit is contained in:
Sergey Svishchev 2019-01-07 23:58:39 +03:00
parent 8da31f65aa
commit 345b49c1b7
1 changed files with 8 additions and 10 deletions
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18
src/devices/bus/isa/sblaster.cpp
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@ -66,7 +66,7 @@ static const int m_cmd_fifo_length[256] =
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 6x */
-1, -1, -1, -1, 3, 3, 3, 3, -1, -1, -1, -1, -1, 1, -1, 1, /* 7x */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 8x */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 9x */
1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 9x */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* Ax */
4, -1, -1, -1, -1, -1, 4, -1, 4, -1, -1, -1, -1, -1, 4, -1, /* Bx */
4, -1, -1, -1, -1, -1, 4, -1, 4, -1, -1, -1, -1, -1, 4, -1, /* Cx */
@ -356,6 +356,7 @@ void sb_device::process_fifo(uint8_t cmd)
break;
case 0x1c: // 8-bit DMA with autoinit
case 0x90: // 8-bit DMA with autoinit, high speed. XXX only on DSP 3.xx
// printf("Start DMA (autoinit, size = %x)\n", m_dsp.dma_length);
m_dsp.dma_transferred = 0;
m_dsp.dma_autoinit = 1;
@ -583,6 +584,12 @@ void sb_device::process_fifo(uint8_t cmd)
mode = m_dsp.fifo[1];
m_dsp.flags = 0;
m_dsp.dma_length = (m_dsp.fifo[2] + (m_dsp.fifo[3]<<8)) + 1;
if(cmd & 0x04)
m_dsp.dma_autoinit = 1;
if(mode & 0x10)
m_dsp.flags |= SIGNED;
if(mode & 0x20)
m_dsp.flags |= STEREO;
if((cmd & 0xf0) == 0xb0)
{
m_dsp.flags |= SIXTEENBIT;
@ -591,15 +598,6 @@ void sb_device::process_fifo(uint8_t cmd)
}
else
drq_w(1);
if(cmd & 0x04)
m_dsp.dma_autoinit = 1;
if(mode & 0x10)
m_dsp.flags |= SIGNED;
if(mode & 0x20)
{
m_dsp.flags |= STEREO;
m_dsp.dma_length <<= 1;
}
m_dsp.dma_transferred = 0;
m_dsp.dma_timer_started = false;
m_dsp.dma_throttled = false;