AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper099.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper099 VS-Unisystem //
//////////////////////////////////////////////////////////////////////////
void Mapper099::Reset()
{
// set CPU bank pointers
if( PROM_8K_SIZE > 2 ) {
SetPROM_32K_Bank( 0, 1, 2, 3 );
} else if( PROM_8K_SIZE > 1 ) {
SetPROM_32K_Bank( 0, 1, 0, 1 );
} else {
SetPROM_32K_Bank( 0, 0, 0, 0 );
}
// set VROM bank
if( VROM_1K_SIZE ) {
SetVROM_8K_Bank( 0 );
}
coin = 0;
}
BYTE Mapper099::ExRead( WORD addr )
{
if( addr == 0x4020 ) {
return coin;
}
return addr>>8;
}
void Mapper099::ExWrite( WORD addr, BYTE data )
{
if( addr == 0x4016 ) {
if( data & 0x04 ) {
SetVROM_8K_Bank( 1 );
} else {
SetVROM_8K_Bank( 0 );
}
if( nes->rom->GetPROM_CRC() == 0xC99EC059 ) { // VS Raid on Bungeling Bay(J)
if( data & 0x02 ) {
nes->cpu->SetIRQ( IRQ_MAPPER );
} else {
nes->cpu->ClrIRQ( IRQ_MAPPER );
}
}
}
if( addr == 0x4020 ) {
coin = data;
}
}