AxibugEmuOnline/References/virtuanessrc097-master/NES/Mapper/Mapper095.cpp

<EFBFBD><EFBFBD>//////////////////////////////////////////////////////////////////////////
// Mapper095  Namcot 106M (Dragon Buster)                               //
//////////////////////////////////////////////////////////////////////////
void	Mapper095::Reset()
{
	reg = 0x00;
	prg0 = 0;
	prg1 = 1;
	SetBank_CPU();

	if( VROM_1K_SIZE ) {
		chr01 = 0;
		chr23 = 2;
		chr4  = 4;
		chr5  = 5;
		chr6  = 6;
		chr7  = 7;
	} else {
		chr01 = chr23 = chr4  = chr5  = chr6  = chr7  = 0;
	}

	SetBank_PPU();

	nes->SetRenderMethod( NES::POST_RENDER );
}

void	Mapper095::Write( WORD addr, BYTE data )
{
	switch( addr & 0xE001 ) {
		case	0x8000:
			reg = data;
			SetBank_CPU();
			SetBank_PPU();
			break;
		case	0x8001:
			if( reg <= 0x05 ) {
				if( data & 0x20 ) SetVRAM_Mirror( VRAM_MIRROR4H );
				else		  SetVRAM_Mirror( VRAM_MIRROR4L );
				data &= 0x1F;
			}

			switch( reg & 0x07 ) {
				case	0x00:
					if( VROM_1K_SIZE ) {
						chr01 = data & 0xFE;
						SetBank_PPU();
					}
					break;
				case	0x01:
					if( VROM_1K_SIZE ) {
						chr23 = data & 0xFE;
						SetBank_PPU();
					}
					break;
				case	0x02:
					if( VROM_1K_SIZE ) {
						chr4 = data;
						SetBank_PPU();
					}
					break;
				case	0x03:
					if( VROM_1K_SIZE ) {
						chr5 = data;
						SetBank_PPU();
					}
					break;
				case	0x04:
					if( VROM_1K_SIZE ) {
						chr6 = data;
						SetBank_PPU();
					}
					break;
				case	0x05:
					if( VROM_1K_SIZE ) {
						chr7 = data;
						SetBank_PPU();
					}
					break;
				case	0x06:
					prg0 = data;
					SetBank_CPU();
					break;
				case	0x07:
					prg1 = data;
					SetBank_CPU();
					break;
			}
			break;
	}
}

void	Mapper095::SetBank_CPU()
{
	if( reg & 0x40 ) {
		SetPROM_32K_Bank( PROM_8K_SIZE-2, prg1, prg0, PROM_8K_SIZE-1 );
	} else {
		SetPROM_32K_Bank( prg0, prg1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
	}
}

void	Mapper095::SetBank_PPU()
{
	if( VROM_1K_SIZE ) {
		if( reg & 0x80 ) {
			SetVROM_8K_Bank( chr4, chr5, chr6, chr7,
					 chr01, chr01+1, chr23, chr23+1 );
		} else {
			SetVROM_8K_Bank( chr01, chr01+1, chr23, chr23+1,
					 chr4, chr5, chr6, chr7 );
		}
	}
}

void	Mapper095::SaveState( LPBYTE p )
{
	p[0] = reg;
	p[1] = prg0;
	p[2] = prg1;
	p[3] = chr01;
	p[4] = chr23;
	p[5] = chr4;
	p[6] = chr5;
	p[7] = chr6;
	p[8] = chr7;
}

void	Mapper095::LoadState( LPBYTE p )
{
	reg   = p[0];
	prg0  = p[1];
	prg1  = p[2];
	chr01 = p[3];
	chr23 = p[4];
	chr4  = p[5];
	chr5  = p[6];
	chr6  = p[7];
	chr7  = p[8];
}