AxibugEmuOnline/References/VirtuaNESex_src_191105/NES/Mapper/Mapper026.cpp
2024-08-05 17:58:53 +08:00

136 lines
2.8 KiB
C++

//////////////////////////////////////////////////////////////////////////
// Mapper026 Konami VRC6 (PA0,PA1 reverse) //
//////////////////////////////////////////////////////////////////////////
void Mapper026::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 );
}
DWORD crc = nes->rom->GetPROM_CRC();
if( crc == 0x30e64d03 ) { // Esper Dream 2 - Aratanaru Tatakai(J)
nes->SetRenderMethod( NES::POST_ALL_RENDER );
}
if( crc == 0x836cc1ab ) { // Mouryou Senki Madara(J)
nes->SetRenderMethod( NES::POST_RENDER );
}
nes->apu->SelectExSound( 1 );
}
void Mapper026::Write( WORD addr, BYTE data )
{
switch( addr & 0xF003 ) {
case 0x8000:
SetPROM_16K_Bank( 4, data );
break;
case 0x9000: case 0x9001: case 0x9002: case 0x9003:
case 0xA000: case 0xA001: case 0xA002: case 0xA003:
case 0xB000: case 0xB001: case 0xB002:
addr = (addr&0xfffc)|((addr&1)<<1)|((addr&2)>>1);
nes->apu->ExWrite( addr, data );
break;
case 0xB003:
data = data & 0x7F;
if( data == 0x08 || data == 0x2C ) SetVRAM_Mirror( VRAM_MIRROR4H );
else if( data == 0x20 ) SetVRAM_Mirror( VRAM_VMIRROR );
else if( data == 0x24 ) SetVRAM_Mirror( VRAM_HMIRROR );
else if( data == 0x28 ) SetVRAM_Mirror( VRAM_MIRROR4L );
break;
case 0xC000:
SetPROM_8K_Bank( 6, data );
break;
case 0xD000:
SetVROM_1K_Bank( 0, data );
break;
case 0xD001:
SetVROM_1K_Bank( 2, data );
break;
case 0xD002:
SetVROM_1K_Bank( 1, data );
break;
case 0xD003:
SetVROM_1K_Bank( 3, data );
break;
case 0xE000:
SetVROM_1K_Bank( 4, data );
break;
case 0xE001:
SetVROM_1K_Bank( 6, data );
break;
case 0xE002:
SetVROM_1K_Bank( 5, data );
break;
case 0xE003:
SetVROM_1K_Bank( 7, data );
break;
case 0xF000:
irq_latch = data;
break;
case 0xF001:
irq_enable = (irq_enable & 0x01) * 3;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xF002:
irq_enable = data & 0x03;
if( irq_enable & 0x02 ) {
irq_counter = irq_latch;
irq_clock = 0;
}
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
}
}
void Mapper026::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->IRQ();
nes->cpu->SetIRQ( IRQ_MAPPER );
} else {
irq_counter++;
}
}
}
}
void Mapper026::SaveState( LPBYTE p )
{
p[0] = irq_enable;
p[1] = irq_counter;
p[2] = irq_latch;
*(INT*)&p[3] = irq_clock;
}
void Mapper026::LoadState( LPBYTE p )
{
irq_enable = p[0];
irq_counter = p[1];
irq_latch = p[2];
irq_clock = *(INT*)&p[3];
}