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i8244: fix y cam register mask

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hap 2020-08-03 22:45:20 +02:00
parent 5b8676cbf1
commit ca3eaa5229
3 changed files with 15 additions and 6 deletions
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2
hash/odyssey2.xml
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@ -374,7 +374,7 @@ The C7010 Chess Module had a NSC800 CMOS microprocessor, with 2K RAM and 8K ROM.
</part>
</software>
<software name="backgamm" supported="no">
<software name="backgamm" supported="partial">
<description>Backgammon (Euro)</description>
<year>1983</year>
<publisher>GST Video</publisher>

17
src/devices/video/i8244.cpp
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@ -237,7 +237,7 @@ offs_t i8244_device::fix_register_mirrors( offs_t offset )
offset &= ~0x10;
}
return offset;
return offset & 0xFF;
}
@ -282,6 +282,11 @@ uint8_t i8244_device::read(offs_t offset)
data = m_x_beam_pos;
break;
case 0xa7: case 0xa8: case 0xa9:
m_stream->update(); // updates sound shift registers
data = m_vdc.reg[offset];
break;
default:
data = m_vdc.reg[offset];
break;
@ -295,8 +300,12 @@ void i8244_device::write(offs_t offset, uint8_t data)
{
offset = fix_register_mirrors( offset );
/* Major systems Y CAM d0 is not connected! */
if (offset >= 0x10 && !(offset & 0x83))
data &= ~0x01;
/* Update the sound */
if( offset >= 0xa7 && offset <= 0xaa )
if (offset >= 0xa7 && offset <= 0xaa)
{
m_stream->update();
}
@ -477,7 +486,7 @@ void i8244_device::render_scanline(int vpos)
/* Regular foreground objects */
for ( int i = ARRAY_LENGTH( m_vdc.s.foreground ) - 1; i >= 0; i-- )
{
int y = m_vdc.s.foreground[i].y & 0xFE;
int y = m_vdc.s.foreground[i].y;
int height = 8 - ( ( ( y >> 1 ) + m_vdc.s.foreground[i].ptr ) & 7 );
if (height == 1) height = 8;
@ -516,7 +525,7 @@ void i8244_device::render_scanline(int vpos)
/* Quad objects */
for ( int i = ARRAY_LENGTH( m_vdc.s.quad ) - 1; i >= 0; i-- )
{
int y = m_vdc.s.quad[i].single[0].y & 0xFE;
int y = m_vdc.s.quad[i].single[0].y;
// Character height is always determined by the height of the 4th character
int height = 8 - ( ( ( y >> 1 ) + m_vdc.s.quad[i].single[3].ptr ) & 7 );

2
src/mame/drivers/odyssey2.cpp
View File

@ -6,7 +6,7 @@ Driver file to handle emulation of the Odyssey2.
TODO:
- odyssey3 cpu/video should probably have a different XTAL
- backgamm does not work, it only shows the background graphics
- backgamm has display timing problems (it does a lot of partial screen updates)
- homecomp does not work, needs new slot device
- g7400 EF9341 R/W is connected to CPU A2, what happens if it is disobeyed?
- a lot more issues, probably, this TODO list was written by someone with