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Drop the upper bit of the address when shifting left, as described http://wiki.osdev.org/ISA_DMA#16_bit_issues. This fixes 16 bit audio in sb16 diagnose.exe [smf-]

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This commit is contained in:
smf- 2016-10-06 09:20:42 +01:00
parent f9acb0c97b
commit ffdb2befff
1 changed files with 2 additions and 2 deletions
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4
src/devices/machine/cs4031.cpp
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@ -362,7 +362,7 @@ READ8_MEMBER( cs4031_device::dma_read_word )
if (m_dma_channel == -1)
return 0xff;
UINT16 result = m_space->read_word(page_offset() + (offset << 1));
UINT16 result = m_space->read_word(page_offset() + ((offset << 1) & 0xffff));
m_dma_high_byte = result >> 8;
return result;
@ -373,7 +373,7 @@ WRITE8_MEMBER( cs4031_device::dma_write_word )
if (m_dma_channel == -1)
return;
m_space->write_word(page_offset() + (offset << 1), (m_dma_high_byte << 8) | data);
m_space->write_word(page_offset() + ((offset << 1) & 0xffff), (m_dma_high_byte << 8) | data);
}
WRITE_LINE_MEMBER( cs4031_device::dma2_dack0_w )