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