101 lines
4.3 KiB
C++
101 lines
4.3 KiB
C++
//////////////////////////////////////////////////////////////////////////
|
||
// Mapper067 SunSoft Mapper 3 //
|
||
//////////////////////////////////////////////////////////////////////////
|
||
void Mapper067::Reset()
|
||
{
|
||
irq_enable = 0;
|
||
irq_toggle = 0;
|
||
irq_counter = 0;
|
||
irq_occur = 0;
|
||
|
||
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
|
||
|
||
SetVROM_4K_Bank( 0, 0 );
|
||
SetVROM_4K_Bank( 4, VROM_4K_SIZE-1 );
|
||
|
||
DWORD crc = nes->rom->GetPROM_CRC();
|
||
|
||
if( crc == 0x7f2a04bf ) { // For Fantasy Zone 2(J)
|
||
nes->SetRenderMethod( NES::PRE_ALL_RENDER );
|
||
}
|
||
}
|
||
|
||
void Mapper067::Write( WORD addr, BYTE data )
|
||
{
|
||
switch( addr & 0xF800 ) {
|
||
case 0x8800:
|
||
SetVROM_2K_Bank( 0, data );
|
||
break;
|
||
case 0x9800:
|
||
SetVROM_2K_Bank( 2, data );
|
||
break;
|
||
case 0xA800:
|
||
SetVROM_2K_Bank( 4, data );
|
||
break;
|
||
case 0xB800:
|
||
SetVROM_2K_Bank( 6, data );
|
||
break;
|
||
|
||
case 0xC800:
|
||
if( !irq_toggle ) {
|
||
irq_counter = (irq_counter&0x00FF)|((INT)data<<8);
|
||
} else {
|
||
irq_counter = (irq_counter&0xFF00)|((INT)data&0xFF);
|
||
}
|
||
irq_toggle ^= 1;
|
||
irq_occur = 0;
|
||
nes->cpu->ClrIRQ( IRQ_MAPPER );
|
||
break;
|
||
case 0xD800:
|
||
irq_enable = data & 0x10;
|
||
irq_toggle = 0;
|
||
irq_occur = 0;
|
||
nes->cpu->ClrIRQ( IRQ_MAPPER );
|
||
break;
|
||
|
||
case 0xE800:
|
||
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 0xF800:
|
||
SetPROM_16K_Bank( 4, data );
|
||
break;
|
||
}
|
||
}
|
||
|
||
void Mapper067::Clock( INT cycles )
|
||
{
|
||
if( irq_enable ) {
|
||
if( (irq_counter -= cycles) <= 0 ) {
|
||
irq_enable = 0;
|
||
irq_occur = 0xFF;
|
||
irq_counter = 0xFFFF;
|
||
nes->cpu->SetIRQ( IRQ_MAPPER );
|
||
}
|
||
}
|
||
|
||
// if( irq_occur ) {
|
||
// nes->cpu->IRQ_NotPending();
|
||
// }
|
||
}
|
||
|
||
void Mapper067::SaveState( LPBYTE p )
|
||
{
|
||
p[0] = irq_enable;
|
||
p[1] = irq_occur;
|
||
p[2] = irq_toggle;
|
||
*((INT*)&p[3]) = irq_counter;
|
||
}
|
||
|
||
void Mapper067::LoadState( LPBYTE p )
|
||
{
|
||
irq_enable = p[0];
|
||
irq_occur = p[1];
|
||
irq_toggle = p[2];
|
||
irq_counter = *((INT*)&p[3]);
|
||
}
|