AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper165.cpp

<EFBFBD><EFBFBD>//////////////////////////////////////////////////////////////////////////
// Mapper165  Fire Emblem Chinese version                               //
//////////////////////////////////////////////////////////////////////////
void	Mapper165::Reset()
{
	for( INT i = 0; i < 8; i++ ) {
		reg[i] = 0x00;
	}
	prg0 = 0;
	prg1 = 1;
	SetBank_CPU();

	chr0 = 0;
	chr1 = 0;
	chr2 = 4;
	chr3 = 4;
	latch = 0xFD;
	SetBank_PPU();

	we_sram  = 0;	// Disable

	nes->ppu->SetChrLatchMode( TRUE );
}

void	Mapper165::Write( WORD addr, BYTE data )
{

	switch( addr & 0xE001 ) {
		case	0x8000:
			reg[0] = data;
			SetBank_CPU();
			SetBank_PPU();
			break;
		case	0x8001:
			reg[1] = data;

			switch( reg[0] & 0x07 ) {
				case	0x00:
					chr0 = data & 0xFC;
					if( latch == 0xFD )
						SetBank_PPU();
					break;
				case	0x01:
					chr1 = data & 0xFC;
					if( latch == 0xFE )
						SetBank_PPU();
					break;

				case	0x02:
					chr2 = data & 0xFC;
					if( latch == 0xFD )
						SetBank_PPU();
					break;
				case	0x04:
					chr3 = data & 0xFC;
					if( latch == 0xFE )
						SetBank_PPU();
					break;

				case	0x06:
					prg0 = data;
					SetBank_CPU();
					break;
				case	0x07:
					prg1 = data;
					SetBank_CPU();
					break;
			}
			break;
		case	0xA000:
			reg[2] = data;
			if( data & 0x01 ) 
			{
				SetVRAM_Mirror( VRAM_HMIRROR );
			}else{
				SetVRAM_Mirror( VRAM_VMIRROR );
			}
			break;
		case	0xA001:
			reg[3] = data;
			break;
		default:
			break;
	}	

}

void	Mapper165::SetBank_CPU()
{
	SetPROM_32K_Bank( prg0, prg1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
}

void	Mapper165::SetBank_PPU()
{
	if(latch==0xFD){
		SetBank_PPUSUB( 0, chr0 );
		SetBank_PPUSUB( 4, chr2 );
	}else{
		SetBank_PPUSUB( 0, chr1 );
		SetBank_PPUSUB( 4, chr3 );
	}
}

void	Mapper165::SetBank_PPUSUB( int bank, int page )
{
	if( page == 0 ) {
		SetCRAM_4K_Bank( bank, page>>2 );
	} else {
		SetVROM_4K_Bank( bank, page>>2 );
	}
}

void	Mapper165::PPU_ChrLatch( WORD addr )
{
	WORD mask = addr&0x1FF0;

	if( mask == 0x1FD0 ) {
		latch = 0xFD;
		SetBank_PPU();
	} else if( mask == 0x1FE0 ) {
		latch = 0xFE;
		SetBank_PPU();
	}

}

void	Mapper165::SaveState( LPBYTE p )
{
	for( INT i = 0; i < 8; i++ ) {
		p[i] = reg[i];
	}
	p[ 8] = prg0;
	p[ 9] = prg1;
	p[10] = chr0;
	p[11] = chr1;
	p[12] = chr2;
	p[13] = chr3;
	p[14] = latch;
}

void	Mapper165::LoadState( LPBYTE p )
{
	for( INT i = 0; i < 8; i++ ) {
		reg[i] = p[i];
	}
	prg0  = p[ 8];
	prg1  = p[ 9];
	chr0 = p[10];
	chr1 = p[11];
	chr2  = p[12];
	chr3  = p[13];
	latch  = p[14];
}