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(MESS) at: fixed 16-bit DMA reading/writing (no whatsnew)

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This commit is contained in:
mahlemiut 2012-09-30 09:50:26 +00:00
parent bf2f9b0071
commit c49ee2ce32
1 changed files with 4 additions and 2 deletions
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6
src/mess/machine/at.c
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@ -187,12 +187,13 @@ WRITE8_MEMBER(at_state::pc_dma_write_byte)
READ8_MEMBER(at_state::pc_dma_read_word)
{
address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
if(m_dma_channel == -1)
return 0xff;
UINT16 result;
offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFE0000;
result = space.read_word(page_offset + ( offset << 1 ) );
result = prog_space.read_word(page_offset + ( offset << 1 ) );
m_dma_high_byte = result & 0xFF00;
return result & 0xFF;
@ -201,11 +202,12 @@ READ8_MEMBER(at_state::pc_dma_read_word)
WRITE8_MEMBER(at_state::pc_dma_write_word)
{
address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
if(m_dma_channel == -1)
return;
offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFE0000;
space.write_word(page_offset + ( offset << 1 ), m_dma_high_byte | data);
prog_space.write_word(page_offset + ( offset << 1 ), m_dma_high_byte | data);
}
READ8_MEMBER( at_state::pc_dma8237_0_dack_r ) { return m_isabus->dack_r(0); }