80 lines
1.5 KiB
C++
80 lines
1.5 KiB
C++
//////////////////////////////////////////////////////////////////////////
|
|
// Mapper006 FFE F4xxx //
|
|
//////////////////////////////////////////////////////////////////////////
|
|
void Mapper006::Reset()
|
|
{
|
|
SetPROM_32K_Bank( 0, 1, 14, 15 );
|
|
|
|
if( VROM_1K_SIZE ) {
|
|
SetVROM_8K_Bank( 0 );
|
|
} else {
|
|
SetCRAM_8K_Bank( 0 );
|
|
}
|
|
|
|
irq_enable = 0;
|
|
irq_counter = 0;
|
|
}
|
|
|
|
void Mapper006::WriteLow( WORD addr, BYTE data )
|
|
{
|
|
switch( addr ) {
|
|
case 0x42FE:
|
|
if( data&0x10 ) SetVRAM_Mirror( VRAM_MIRROR4H );
|
|
else SetVRAM_Mirror( VRAM_MIRROR4L );
|
|
break;
|
|
case 0x42FF:
|
|
if( data&0x10 ) SetVRAM_Mirror( VRAM_HMIRROR );
|
|
else SetVRAM_Mirror( VRAM_VMIRROR );
|
|
break;
|
|
|
|
case 0x4501:
|
|
irq_enable = 0;
|
|
|
|
nes->cpu->ClrIRQ( IRQ_MAPPER );
|
|
break;
|
|
case 0x4502:
|
|
irq_counter = (irq_counter&0xFF00)|data;
|
|
break;
|
|
case 0x4503:
|
|
irq_counter = (irq_counter&0x00FF)|((INT)data<<8);
|
|
irq_enable = 0xFF;
|
|
|
|
nes->cpu->ClrIRQ( IRQ_MAPPER );
|
|
break;
|
|
default:
|
|
Mapper::WriteLow( addr, data );
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Mapper006::Write( WORD addr, BYTE data )
|
|
{
|
|
SetPROM_16K_Bank( 4, (data&0x3C)>>2 );
|
|
SetCRAM_8K_Bank( data&0x03 );
|
|
}
|
|
|
|
void Mapper006::HSync( INT scanline )
|
|
{
|
|
if( irq_enable ) {
|
|
irq_counter+=133;
|
|
if( irq_counter >= 0xFFFF ) {
|
|
// nes->cpu->IRQ();
|
|
irq_counter = 0;
|
|
|
|
nes->cpu->SetIRQ( IRQ_MAPPER );
|
|
}
|
|
}
|
|
}
|
|
|
|
void Mapper006::SaveState( LPBYTE p )
|
|
{
|
|
p[0] = irq_enable;
|
|
*(INT*)&p[1] = irq_counter;
|
|
}
|
|
|
|
void Mapper006::LoadState( LPBYTE p )
|
|
{
|
|
irq_enable = p[0];
|
|
irq_counter = *(INT*)&p[1];
|
|
}
|