mapper015.cpp

著名的任天堂FC游戏机模拟器VirtuaNes 085版的源码!

//////////////////////////////////////////////////////////////////////////
// Mapper015  100-in-1 chip                                             //
//////////////////////////////////////////////////////////////////////////
void	Mapper015::Reset()
{
	SetPROM_32K_Bank( 0, 1, 2, 3 );
}

void	Mapper015::Write( WORD addr, BYTE data )
{
	switch( addr ) {
		case	0x8000:
			if( data&0x80 ) {
				SetPROM_8K_Bank( 4, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 5, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 6, (data&0x3F)*2+3 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+2 );
			} else {
				SetPROM_8K_Bank( 4, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 5, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 6, (data&0x3F)*2+2 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+3 );
			}
			if( data&0x40 ) SetVRAM_Mirror( VRAM_HMIRROR );
			else		SetVRAM_Mirror( VRAM_VMIRROR );
			break;
		case	0x8001:
			if( data&0x80 ) {
				SetPROM_8K_Bank( 6, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+0 );
			} else {
				SetPROM_8K_Bank( 6, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+1 );
			}
			break;
		case	0x8002:
			if( data&0x80 ) {
				SetPROM_8K_Bank( 4, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 5, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 6, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+1 );
			} else {
				SetPROM_8K_Bank( 4, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 5, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 6, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+0 );
			}
			break;
		case	0x8003:
			if( data&0x80 ) {
				SetPROM_8K_Bank( 6, (data&0x3F)*2+1 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+0 );
			} else {
				SetPROM_8K_Bank( 6, (data&0x3F)*2+0 );
				SetPROM_8K_Bank( 7, (data&0x3F)*2+1 );
			}
			if( data&0x40 ) SetVRAM_Mirror( VRAM_HMIRROR );
			else		SetVRAM_Mirror( VRAM_VMIRROR );
			break;
	}
}