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[ES-1064] Qi Long Zhu (C) should be mostly playable now, still some graphic glitches though

This commit is contained in:
qeed 2009-10-19 10:18:20 +00:00
parent 15c980ff10
commit e63fb66b40
1 changed files with 12 additions and 13 deletions
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25
src/mappers/253.cpp
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@ -8,12 +8,16 @@ static int32 irq_enable, irq_counter, irq_latch, irq_clock;
static void Mapper253_IRQHook(int cycles)
{
//basically, this happens at every frame
//0x72 is 114 cycles, so like one scanline
//happens for 0xff scanlines so 256 scanlines (frame)
if( irq_enable & 0x02 )
{
if( (irq_clock+=cycles) >= 0x72 )
{
irq_clock -= 0x72;
if( irq_counter == 0xFF )
if( irq_counter == 0xFF)
{
irq_counter = irq_latch;
irq_enable = (irq_enable & 0x01) * 3;
@ -40,22 +44,20 @@ static void SetBank_PPUSUB(int bank, int page)
}
if ((page == 4) || (page == 5))
{
printf("Page in 4 5: %d\n", page);
if(VRAM_switch == 0)
setchr1( bank << 10, page ); //CHR-ROM
else
setchr1( bank << 10, page ); //CHR-RAM
// [ES-1064] Qi Long Zhu (C).NES game uses CHR-RAM for these pages
//and doesn't seem to set VRAM switch so use
//CHR-RAM as default for now
//if (VRAM_switch == 0)
// setchr1(bank << 10, page); //CHR-ROM
else
setvramb1(&CHRRAM[page << 10], page << 10, 0); //CHR-RAM
}
else
{
printf("Page: %d\n", page);
setchr1(bank << 10, page);
}
}
static DECLFW(Mapper253_Write)
{
printf("Address: 0x%X V: 0x%X\n", A, V);
if (A == 0x8010) //8kb select at 0x8000
{
setprg8(0x8000, V);
@ -169,9 +171,6 @@ static DECLFW(Mapper253_Write)
}
X6502_IRQEnd(FCEU_IQEXT);
break;
default:
break;
//printf("Not handled 0x%X 0x%X", A, V);
}
}