69 lines
1.3 KiB
C++
69 lines
1.3 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper234 Maxi-15 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper234::Reset()
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{
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SetPROM_32K_Bank( 0, 1, 2, 3 );
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reg[0] = 0;
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reg[1] = 0;
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}
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void Mapper234::Read( WORD addr, BYTE data)
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{
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if( addr >= 0xFF80 && addr <= 0xFF9F ) {
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if( !reg[0] ) {
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reg[0] = data;
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SetBank();
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}
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}
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if( addr >= 0xFFE8 && addr <= 0xFFF7 ) {
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reg[1] = data;
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SetBank();
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}
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}
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void Mapper234::Write( WORD addr, BYTE data )
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{
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if( addr >= 0xFF80 && addr <= 0xFF9F ) {
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if( !reg[0] ) {
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reg[0] = data;
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SetBank();
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}
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}
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if( addr >= 0xFFE8 && addr <= 0xFFF7 ) {
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reg[1] = data;
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SetBank();
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}
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}
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void Mapper234::SetBank()
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{
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if( reg[0] & 0x80 ) {
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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( reg[0] & 0x40 ) {
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SetPROM_32K_Bank( (reg[0]&0x0E)|(reg[1]&0x01) );
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SetVROM_8K_Bank( ((reg[0]&0x0E)<<2)|((reg[1]>>4)&0x07) );
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} else {
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SetPROM_32K_Bank( reg[0]&0x0F );
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SetVROM_8K_Bank( ((reg[0]&0x0F)<<2)|((reg[1]>>4)&0x03) );
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}
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}
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void Mapper234::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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}
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void Mapper234::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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}
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