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rainbow: guess at vector mode behavior (nw)

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This commit is contained in:
cracyc 2016-11-20 22:08:28 -06:00
parent b8b0774997
commit 9557c8bcc0
1 changed files with 2 additions and 12 deletions
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14
src/mame/drivers/rainbow.cpp
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@ -2695,7 +2695,7 @@ READ16_MEMBER(rainbow_state::vram_r)
return m_video_ram[ (offset & 0x7fff) + (0x8000 * readback_plane)];
}
return 0;
return 0xffff;
}
// NOTE: Rainbow has separate registers for fore and background.
@ -2709,16 +2709,6 @@ WRITE16_MEMBER(rainbow_state::vram_w)
else
offset = ( m_GDC_SCROLL_BUFFER[ (offset & 0x1FC0) >> 6 ] << 6) | (offset & 0x3F);
}
else
{
if(data & 0xff00)
{
data >>= 8;
offset += 1;
}
else
data &= 0xff;
}
offset &= 0xffff; // same as in VT240?
uint16_t chr = data; // VT240 : uint8_t
@ -2778,7 +2768,7 @@ WRITE16_MEMBER(rainbow_state::vram_w)
if(!(m_GDC_MODE_REGISTER & GDC_MODE_VECTOR)) // 0 : (NOT VECTOR MODE) Text Mode and Write Mask Batch
out = (out & m_GDC_WRITE_MASK) | (mem & ~m_GDC_WRITE_MASK); // // M_MASK (1st use)
else
out = (out & data) | (mem & ~data); // VECTOR MODE !
out = (out & ~data) | (mem & data); // VECTOR MODE !
if(m_GDC_MODE_REGISTER & GDC_MODE_ENABLE_WRITES) // 0x10
m_video_ram[(offset & 0xffff) + (0x8000 * i)] = out;