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pc9801: maybe this is better, I don't know of any users of mode 1(nw)

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This commit is contained in:
cracyc 2016-02-18 16:01:24 -06:00
parent 553c0c73c5
commit f36915384c
1 changed files with 10 additions and 4 deletions
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14
src/mame/drivers/pc9801.cpp
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@ -2894,10 +2894,13 @@ READ8_MEMBER(pc9801_state::dma_read_byte)
switch(m_dma_autoinc[m_dack])
{
case 1:
++m_dma_offset[m_dack] &= 0xf;
{
UINT8 page = m_dma_offset[m_dack];
m_dma_offset[m_dack] = ((page + 1) & 0xf) | (page & 0xf0);
break;
}
case 3:
++m_dma_offset[m_dack] &= 0xff;
m_dma_offset[m_dack]++;
break;
}
}
@ -2917,10 +2920,13 @@ WRITE8_MEMBER(pc9801_state::dma_write_byte)
switch(m_dma_autoinc[m_dack])
{
case 1:
++m_dma_offset[m_dack] &= 0xf;
{
UINT8 page = m_dma_offset[m_dack];
m_dma_offset[m_dack] = ((page + 1) & 0xf) | (page & 0xf0);
break;
}
case 3:
++m_dma_offset[m_dack] &= 0xff;
m_dma_offset[m_dack]++;
break;
}
}