AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper255.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper255 110-in-1 //
//////////////////////////////////////////////////////////////////////////
void Mapper255::Reset()
{
SetPROM_32K_Bank( 0 );
SetVROM_8K_Bank( 0 );
SetVRAM_Mirror( VRAM_VMIRROR );
reg[0] = 0;
reg[1] = 0;
reg[2] = 0;
reg[3] = 0;
}
BYTE Mapper255::ReadLow( WORD addr, BYTE data )
{
if( addr >= 0x5800 ) {
return reg[addr&0x0003] & 0x0F;
} else {
return addr>>8;
}
}
void Mapper255::WriteLow( WORD addr, BYTE data )
{
if( addr >= 0x5800 ) {
reg[addr&0x0003] = data & 0x0F;
}
}
void Mapper255::Write( WORD addr, BYTE data )
{
BYTE prg = (addr & 0x0F80)>>7;
INT chr = (addr & 0x003F);
INT bank = (addr & 0x4000)>>14;
if( addr & 0x2000 ) {
SetVRAM_Mirror( VRAM_HMIRROR );
} else {
SetVRAM_Mirror( VRAM_VMIRROR );
}
if( addr & 0x1000 ) {
if( addr & 0x0040 ) {
SetPROM_8K_Bank( 4, 0x80*bank+prg*4+2 );
SetPROM_8K_Bank( 5, 0x80*bank+prg*4+3 );
SetPROM_8K_Bank( 6, 0x80*bank+prg*4+2 );
SetPROM_8K_Bank( 7, 0x80*bank+prg*4+3 );
} else {
SetPROM_8K_Bank( 4, 0x80*bank+prg*4+0 );
SetPROM_8K_Bank( 5, 0x80*bank+prg*4+1 );
SetPROM_8K_Bank( 6, 0x80*bank+prg*4+0 );
SetPROM_8K_Bank( 7, 0x80*bank+prg*4+1 );
}
} else {
SetPROM_8K_Bank( 4, 0x80*bank+prg*4+0 );
SetPROM_8K_Bank( 5, 0x80*bank+prg*4+1 );
SetPROM_8K_Bank( 6, 0x80*bank+prg*4+2 );
SetPROM_8K_Bank( 7, 0x80*bank+prg*4+3 );
}
SetVROM_1K_Bank( 0, 0x200*bank+chr*8+0 );
SetVROM_1K_Bank( 1, 0x200*bank+chr*8+1 );
SetVROM_1K_Bank( 2, 0x200*bank+chr*8+2 );
SetVROM_1K_Bank( 3, 0x200*bank+chr*8+3 );
SetVROM_1K_Bank( 4, 0x200*bank+chr*8+4 );
SetVROM_1K_Bank( 5, 0x200*bank+chr*8+5 );
SetVROM_1K_Bank( 6, 0x200*bank+chr*8+6 );
SetVROM_1K_Bank( 7, 0x200*bank+chr*8+7 );
}
void Mapper255::SaveState( LPBYTE p )
{
p[ 0] = reg[0];
p[ 1] = reg[1];
p[ 2] = reg[2];
p[ 3] = reg[3];
}
void Mapper255::LoadState( LPBYTE p )
{
reg[0] = p[ 0];
reg[1] = p[ 1];
reg[2] = p[ 2];
reg[3] = p[ 3];
}