AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper085.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper085 Konami VRC7 //
//////////////////////////////////////////////////////////////////////////
void Mapper085::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 );
} else {
SetCRAM_8K_Bank( 0 );
}
#if 0
// DWORD crc = nes->rom->GetPROM_CRC();
// if( crc == 0x1aa0479c ) { // For Tiny Toon Adventures 2 - Montana Land he Youkoso(J)
// nes->SetRenderMethod( NES::PRE_RENDER );
// }
// if( crc == 0x33ce3ff0 ) { // For Lagrange Point(J)
// nes->SetRenderMethod( NES::TILE_RENDER );
// }
#endif
nes->apu->SelectExSound( 2 );
}
void Mapper085::Write( WORD addr, BYTE data )
{
switch( addr & 0xF038 ) {
case 0x8000:
SetPROM_8K_Bank( 4, data );
break;
case 0x8008:
case 0x8010:
SetPROM_8K_Bank( 5, data );
break;
case 0x9000:
SetPROM_8K_Bank( 6, data );
break;
case 0x9010:
case 0x9030:
nes->apu->ExWrite( addr, data );
break;
case 0xA000:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 0, data );
} else {
SetCRAM_1K_Bank( 0, data );
}
break;
case 0xA008:
case 0xA010:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 1, data );
} else {
SetCRAM_1K_Bank( 1, data );
}
break;
case 0xB000:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 2, data );
} else {
SetCRAM_1K_Bank( 2, data );
}
break;
case 0xB008:
case 0xB010:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 3, data );
} else {
SetCRAM_1K_Bank( 3, data );
}
break;
case 0xC000:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 4, data );
} else {
SetCRAM_1K_Bank( 4, data );
}
break;
case 0xC008:
case 0xC010:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 5, data );
} else {
SetCRAM_1K_Bank( 5, data );
}
break;
case 0xD000:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 6, data );
} else {
SetCRAM_1K_Bank( 6, data );
}
break;
case 0xD008:
case 0xD010:
if( VROM_1K_SIZE ) {
SetVROM_1K_Bank( 7, data );
} else {
SetCRAM_1K_Bank( 7, data );
}
break;
case 0xE000:
data &= 0x03;
if( data == 0 ) SetVRAM_Mirror( VRAM_VMIRROR );
else if( data == 1 ) SetVRAM_Mirror( VRAM_HMIRROR );
else if( data == 2 ) SetVRAM_Mirror( VRAM_MIRROR4L );
else SetVRAM_Mirror( VRAM_MIRROR4H );
break;
case 0xE008:
case 0xE010:
irq_latch = data;
break;
case 0xF000:
irq_enable = data & 0x03;
irq_counter = irq_latch;
irq_clock = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xF008:
case 0xF010:
irq_enable = (irq_enable & 0x01) * 3;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
}
}
void Mapper085::Clock( INT cycles )
{
if( irq_enable & 0x02 ) {
irq_clock += cycles*4;
while( irq_clock >= 455 ) {
irq_clock -= 455;
irq_counter++;
if( irq_counter == 0 ) {
irq_counter = irq_latch;
nes->cpu->SetIRQ( IRQ_MAPPER );
}
}
}
}
void Mapper085::SaveState( LPBYTE p )
{
p[0] = irq_enable;
p[1] = irq_counter;
p[2] = irq_latch;
*((INT*)&p[4]) = irq_clock;
}
void Mapper085::LoadState( LPBYTE p )
{
irq_enable = p[0];
irq_counter = p[1];
irq_latch = p[2];
irq_clock = *((INT*)&p[4]);
}