AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper182.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper182 PC-SuperDonkeyKong //
//////////////////////////////////////////////////////////////////////////
void Mapper182::Reset()
{
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
SetVROM_8K_Bank( 0 );
reg = 0;
irq_enable = 0;
irq_counter = 0;
}
void Mapper182::Write( WORD addr, BYTE data )
{
switch( addr & 0xF003 ) {
case 0x8001:
if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
else SetVRAM_Mirror( VRAM_VMIRROR );
break;
case 0xA000:
reg = data & 0x07;
break;
case 0xC000:
switch( reg ) {
case 0:
SetVROM_1K_Bank( 0, (data&0xFE)+0 );
SetVROM_1K_Bank( 1, (data&0xFE)+1 );
break;
case 1:
SetVROM_1K_Bank( 5, data );
break;
case 2:
SetVROM_1K_Bank( 2, (data&0xFE)+0 );
SetVROM_1K_Bank( 3, (data&0xFE)+1 );
break;
case 3:
SetVROM_1K_Bank( 7, data );
break;
case 4:
SetPROM_8K_Bank( 4, data );
break;
case 5:
SetPROM_8K_Bank( 5, data );
break;
case 6:
SetVROM_1K_Bank( 4, data );
break;
case 7:
SetVROM_1K_Bank( 6, data );
break;
}
break;
case 0xE003:
irq_enable = data;
irq_counter = data;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
}
}
void Mapper182::HSync( INT scanline )
{
if( irq_enable ) {
if( (scanline >= 0 && scanline <= 239) && nes->ppu->IsDispON() ) {
if( !(--irq_counter) ) {
irq_enable = 0;
irq_counter = 0;
// nes->cpu->IRQ_NotPending();
nes->cpu->SetIRQ( IRQ_MAPPER );
}
}
}
}
void Mapper182::SaveState( LPBYTE p )
{
p[0] = reg;
p[1] = irq_enable;
p[2] = irq_counter;
}
void Mapper182::LoadState( LPBYTE p )
{
reg = p[0];
irq_enable = p[1];
irq_counter = p[2];
}