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isa_sblaster : Corrects the output in adpcm mode and inhibits irqs after the protection command. Test-sbc.exe works again. by Carl (no whatsnew)

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This commit is contained in:
Miodrag Milanovic 2012-09-16 14:13:24 +00:00
parent 0680647be5
commit 1dfbc23b42
2 changed files with 13 additions and 4 deletions
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16
src/mess/machine/isa_sblaster.c
View File

@ -435,6 +435,8 @@ void sb_device::process_fifo(UINT8 cmd)
m_dsp.prot_count &= 3;
m_dsp.adc_transferred = 0;
m_dsp.adc_length = 1;
m_dsp.wbuf_status = 0x80;
m_dsp.dma_no_irq = true;
m_dack_out = (UINT8)(m_dsp.prot_value & 0xff);
drq_w(1);
break;
@ -912,6 +914,7 @@ void sb_device::device_reset()
m_dsp.frequency = 8000; // per stereo-fx
m_dsp.irq_active = 0;
m_mixer_index = 0;
m_dsp.dma_no_irq = false;
}
UINT8 sb_device::dack_r(int line)
@ -926,7 +929,12 @@ UINT8 sb_device::dack_r(int line)
m_dsp.adc_transferred = 0;
drq_w(1);
}
irq_w(1, IRQ_DMA8);
else
m_dsp.wbuf_status = 0;
if(!m_dsp.dma_no_irq)
irq_w(1, IRQ_DMA8);
else
m_dsp.dma_no_irq = false;
}
else
drq_w(1);
@ -1110,7 +1118,7 @@ void sb_device::device_timer(emu_timer &timer, device_timer_id tid, int param, v
m_dsp.adpcm_ref = m_dsp.data[m_dsp.d_rptr++];
m_dsp.adpcm_new_ref = false;
m_dacl->write_unsigned8(m_dsp.adpcm_ref);
m_dacl->write_unsigned8(m_dsp.adpcm_ref);
m_dacr->write_unsigned8(m_dsp.adpcm_ref);
break;
}
lsample = m_dsp.data[m_dsp.d_rptr];
@ -1138,7 +1146,7 @@ void sb_device::device_timer(emu_timer &timer, device_timer_id tid, int param, v
m_dsp.adpcm_ref = m_dsp.data[m_dsp.d_rptr++];
m_dsp.adpcm_new_ref = false;
m_dacl->write_unsigned8(m_dsp.adpcm_ref);
m_dacl->write_unsigned8(m_dsp.adpcm_ref);
m_dacr->write_unsigned8(m_dsp.adpcm_ref);
break;
}
lsample = m_dsp.data[m_dsp.d_rptr];
@ -1163,7 +1171,7 @@ void sb_device::device_timer(emu_timer &timer, device_timer_id tid, int param, v
m_dsp.adpcm_ref = m_dsp.data[m_dsp.d_rptr++];
m_dsp.adpcm_new_ref = false;
m_dacl->write_unsigned8(m_dsp.adpcm_ref);
m_dacl->write_unsigned8(m_dsp.adpcm_ref);
m_dacr->write_unsigned8(m_dsp.adpcm_ref);
break;
}
lsample = m_dsp.data[m_dsp.d_rptr];

1
src/mess/machine/isa_sblaster.h
View File

@ -34,6 +34,7 @@ struct sb8_dsp_state
UINT16 version;
UINT8 test_reg;
UINT8 speaker_on;
bool dma_no_irq;
UINT32 prot_count;
INT32 prot_value;
UINT32 frequency;