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z29: Fix pseudo-DMA memory fill mode (nw)

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This commit is contained in:
AJR 2018-10-23 07:13:34 -04:00
parent 484e0bb9fb
commit 3b84297de5
1 changed files with 16 additions and 8 deletions
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24
src/mame/drivers/z29.cpp
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@ -50,31 +50,39 @@ private:
required_shared_ptr<u8> m_attrmem;
required_region_ptr<u8> m_chargen;
bool m_t0;
bool m_dmatype;
};
void z29_state::machine_start()
{
save_item(NAME(m_t0));
save_item(NAME(m_dmatype));
}
void z29_state::p3_w(u8 data)
{
m_t0 = BIT(data, 4);
m_dmatype = BIT(data, 4);
}
READ8_MEMBER(z29_state::bs_24k_r)
{
if (!machine().side_effects_disabled())
{
u8 chardata = m_charmem[offset];
u8 attrdata = m_attrmem[offset] & 0xf;
if (m_dmatype)
{
u8 chardata = m_charmem[offset];
u8 attrdata = m_attrmem[offset] & 0xf;
m_crtc[0]->dack_w(space, 0, chardata & 0x7f);
m_crtc[1]->dack_w(space, 0, (chardata & 0x60) | (BIT(chardata, 7) ? 0x10 : 0) | attrdata);
m_crtc[0]->dack_w(space, 0, chardata & 0x7f);
m_crtc[1]->dack_w(space, 0, (chardata & 0x60) | (BIT(chardata, 7) ? 0x10 : 0) | attrdata);
}
else
{
m_charmem[offset] = 0x20;
m_attrmem[offset] = 0;
}
}
return m_t0 ? 0x24 : 0x20;
return m_dmatype ? 0x24 : 0x20;
}
WRITE8_MEMBER(z29_state::crtc_w)