AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper024.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper024 Konami VRC6(Normal) //
//////////////////////////////////////////////////////////////////////////
void Mapper024::Reset()
{
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
irq_clock = 0;
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
if( VROM_1K_SIZE ) {
SetVROM_8K_Bank( 0 );
}
nes->SetRenderMethod( NES::POST_RENDER );
// nes->SetRenderMethod( NES::PRE_RENDER );
nes->apu->SelectExSound( 1 );
}
void Mapper024::Write( WORD addr, BYTE data )
{
switch( addr & 0xF003 ) {
case 0x8000:
SetPROM_16K_Bank( 4, data );
break;
case 0x9000: case 0x9001: case 0x9002:
case 0xA000: case 0xA001: case 0xA002:
case 0xB000: case 0xB001: case 0xB002:
nes->apu->ExWrite( addr, data );
break;
case 0xB003:
data = data & 0x0C;
if( data == 0x00 ) SetVRAM_Mirror( VRAM_VMIRROR );
else if( data == 0x04 ) SetVRAM_Mirror( VRAM_HMIRROR );
else if( data == 0x08 ) SetVRAM_Mirror( VRAM_MIRROR4L );
else if( data == 0x0C ) SetVRAM_Mirror( VRAM_MIRROR4H );
break;
case 0xC000:
SetPROM_8K_Bank( 6, data );
break;
case 0xD000:
SetVROM_1K_Bank( 0, data );
break;
case 0xD001:
SetVROM_1K_Bank( 1, data );
break;
case 0xD002:
SetVROM_1K_Bank( 2, data );
break;
case 0xD003:
SetVROM_1K_Bank( 3, data );
break;
case 0xE000:
SetVROM_1K_Bank( 4, data );
break;
case 0xE001:
SetVROM_1K_Bank( 5, data );
break;
case 0xE002:
SetVROM_1K_Bank( 6, data );
break;
case 0xE003:
SetVROM_1K_Bank( 7, data );
break;
case 0xF000:
irq_latch = data;
break;
case 0xF001:
irq_enable = data & 0x03;
if( irq_enable & 0x02 ) {
irq_counter = irq_latch;
irq_clock = 0;
}
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xF002:
irq_enable = (irq_enable & 0x01) * 3;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
}
}
void Mapper024::Clock( INT cycles )
{
if( irq_enable & 0x02 ) {
if( (irq_clock+=cycles) >= 0x72 ) {
irq_clock -= 0x72;
if( irq_counter == 0xFF ) {
irq_counter = irq_latch;
// nes->cpu->IRQ_NotPending();
nes->cpu->SetIRQ( IRQ_MAPPER );
} else {
irq_counter++;
}
}
}
}
void Mapper024::SaveState( LPBYTE p )
{
p[0] = irq_enable;
p[1] = irq_counter;
p[2] = irq_latch;
*(INT*)&p[3] = irq_clock;
}
void Mapper024::LoadState( LPBYTE p )
{
irq_enable = p[0];
irq_counter = p[1];
irq_latch = p[2];
irq_clock = *(INT*)&p[3];
}