AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper243.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper243 PC-Sachen/Hacker //
//////////////////////////////////////////////////////////////////////////
void Mapper243::Reset()
{
SetPROM_32K_Bank( 0 );
if( VROM_8K_SIZE > 4 ) {
SetVROM_8K_Bank( 4 );
} else if( VROM_8K_SIZE ) {
SetVROM_8K_Bank( 0 );
}
SetVRAM_Mirror( VRAM_HMIRROR );
reg[0] = 0;
reg[1] = 0;
reg[2] = 3;
reg[3] = 0;
}
void Mapper243::WriteLow( WORD addr, BYTE data )
{
if( (addr&0x4101) == 0x4100 ) {
reg[0] = data;
} else if( (addr&0x4101) == 0x4101 ) {
switch( reg[0] & 0x07 ) {
case 0:
reg[1] = 0;
reg[2] = 3;
break;
case 4:
reg[2] = (reg[2]&0x06)|(data&0x01);
break;
case 5:
reg[1] = data&0x01;
break;
case 6:
reg[2] = (reg[2]&0x01)|((data&0x03)<<1);
break;
case 7:
reg[3] = data&0x01;
break;
default:
break;
}
SetPROM_32K_Bank( reg[1] );
SetVROM_8K_Bank( reg[2]*8+0, reg[2]*8+1, reg[2]*8+2, reg[2]*8+3,
reg[2]*8+4, reg[2]*8+5, reg[2]*8+6, reg[2]*8+7 );
if( reg[3] ) {
SetVRAM_Mirror( VRAM_VMIRROR );
} else {
SetVRAM_Mirror( VRAM_HMIRROR );
}
}
}
void Mapper243::SaveState( LPBYTE p )
{
p[0] = reg[0];
p[1] = reg[1];
p[2] = reg[2];
p[3] = reg[3];
}
void Mapper243::LoadState( LPBYTE p )
{
reg[0] = p[0];
reg[1] = p[1];
reg[2] = p[2];
reg[3] = p[3];
}