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Attempt to fix interlace ...

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This commit is contained in:
Angelo Salese 2012-12-10 20:38:19 +00:00
parent ed43fa2b05
commit 155b61dd0b
1 changed files with 26 additions and 3 deletions
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29
src/mess/drivers/pc9801.c
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@ -317,7 +317,7 @@ public:
int m_dack; int m_dack;
UINT8 m_vrtc_irq_mask; UINT8 m_vrtc_irq_mask;
UINT8 m_video_ff[8]; UINT8 m_video_ff[8],m_gfx_ff;
UINT8 m_video_reg[6]; UINT8 m_video_reg[6];
UINT8 m_pal_clut[4]; UINT8 m_pal_clut[4];
@ -1051,10 +1051,33 @@ WRITE8_MEMBER(pc9801_state::pc9801_vrtc_mask_w)
WRITE8_MEMBER(pc9801_state::pc9801_video_ff_w) WRITE8_MEMBER(pc9801_state::pc9801_video_ff_w)
{ {
if((offset & 1) == 0) if((offset & 1) == 0)
{ {
m_video_ff[(data & 0x0e) >> 1] = data & 1; /*
TODO: this is my best bet so far. Register 4 is annoying, the pattern always is:
Write to video FF register Graphic -> 00
Write to video FF register 200 lines -> 0x
Write to video FF register 200 lines -> 00
where x is the current mode.
*/
switch((data & 0x0e) >> 1)
{
case 1:
m_gfx_ff = 1;
if(data & 1)
printf("Graphic f/f actually enabled!\n");
break;
case 4:
if(m_gfx_ff)
{
m_video_ff[(data & 0x0e) >> 1] = data & 1;
m_gfx_ff = 0;
}
break;
default: m_video_ff[(data & 0x0e) >> 1] = data & 1; break;
}
if(1) if(1)
{ {