47 lines
998 B
C++
47 lines
998 B
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper228 Action 52 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper228::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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}
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void Mapper228::Write( WORD addr, BYTE data )
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{
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BYTE prg = (addr&0x0780)>>7;
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switch( (addr&0x1800)>>11 ) {
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case 1:
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prg |= 0x10;
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break;
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case 3:
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prg |= 0x20;
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break;
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}
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if( addr & 0x0020 ) {
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prg <<= 1;
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if( addr & 0x0040 ) {
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prg++;
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}
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SetPROM_8K_Bank( 4, prg*4+0 );
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SetPROM_8K_Bank( 5, prg*4+1 );
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SetPROM_8K_Bank( 6, prg*4+0 );
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SetPROM_8K_Bank( 7, prg*4+1 );
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} else {
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SetPROM_8K_Bank( 4, prg*4+0 );
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SetPROM_8K_Bank( 5, prg*4+1 );
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SetPROM_8K_Bank( 6, prg*4+2 );
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SetPROM_8K_Bank( 7, prg*4+3 );
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}
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SetVROM_8K_Bank( ((addr&0x000F)<<2)|(data&0x03) );
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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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}
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