AxibugEmuOnline/References/virtuanessrc097-master/NES/Mapper/Mapper057.cpp
2024-08-05 17:58:53 +08:00

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//////////////////////////////////////////////////////////////////////////
// Mapper057 //
//////////////////////////////////////////////////////////////////////////
void Mapper057::Reset()
{
SetPROM_32K_Bank( 0, 1, 0, 1 );
SetVROM_8K_Bank( 0 );
reg = 0;
}
void Mapper057::Write( WORD addr, BYTE data )
{
switch( addr ) {
case 0x8000:
case 0x8001:
case 0x8002:
case 0x8003:
if( data & 0x40 ) {
SetVROM_8K_Bank( (data&0x03)+((reg&0x10)>>1)+(reg&0x07) );
}
break;
case 0x8800:
reg = data;
if( data & 0x80 ) {
SetPROM_8K_Bank( 4, ((data & 0x40)>>6)*4+8+0 );
SetPROM_8K_Bank( 5, ((data & 0x40)>>6)*4+8+1 );
SetPROM_8K_Bank( 6, ((data & 0x40)>>6)*4+8+2 );
SetPROM_8K_Bank( 7, ((data & 0x40)>>6)*4+8+3 );
} else {
SetPROM_8K_Bank( 4, ((data & 0x60)>>5)*2+0 );
SetPROM_8K_Bank( 5, ((data & 0x60)>>5)*2+1 );
SetPROM_8K_Bank( 6, ((data & 0x60)>>5)*2+0 );
SetPROM_8K_Bank( 7, ((data & 0x60)>>5)*2+1 );
}
SetVROM_8K_Bank( (data&0x07)+((data&0x10)>>1) );
if( data & 0x08 ) SetVRAM_Mirror( VRAM_HMIRROR );
else SetVRAM_Mirror( VRAM_VMIRROR );
break;
}
}
void Mapper057::SaveState( LPBYTE p )
{
p[0] = reg;
}
void Mapper057::LoadState( LPBYTE p )
{
reg = p[0];
}