62 lines
1.1 KiB
C++
62 lines
1.1 KiB
C++
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/////////////////////////////////////////////////////////////////////
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// Mapper 226
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void NES_mapper226::Reset()
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{
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// set CPU bank pointers
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set_CPU_banks(0,1,2,3);
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regs[0] = 0;
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regs[1] = 0;
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}
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void NES_mapper226::MemoryWrite(uint32 addr, uint8 data)
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{
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if(addr & 0x001)
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{
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regs[1] = data;
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}
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else
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{
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regs[0] = data;
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}
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if(regs[0] & 0x40)
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{
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set_mirroring(NES_PPU::MIRROR_VERT);
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}
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else
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{
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set_mirroring(NES_PPU::MIRROR_HORIZ);
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}
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uint8 prg_bank = ((regs[0] & 0x1E) >> 1) | ((regs[0] & 0x80) >> 3) | ((regs[1] & 0x01) << 5);
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if(regs[0] & 0x20)
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{
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if(regs[0] & 0x01)
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{
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set_CPU_bank4(prg_bank*4+2);
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set_CPU_bank5(prg_bank*4+3);
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set_CPU_bank6(prg_bank*4+2);
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set_CPU_bank7(prg_bank*4+3);
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}
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else
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{
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set_CPU_bank4(prg_bank*4+0);
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set_CPU_bank5(prg_bank*4+1);
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set_CPU_bank6(prg_bank*4+0);
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set_CPU_bank7(prg_bank*4+1);
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}
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}
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else
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{
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set_CPU_bank4(prg_bank*4+0);
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set_CPU_bank5(prg_bank*4+1);
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set_CPU_bank6(prg_bank*4+2);
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set_CPU_bank7(prg_bank*4+3);
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}
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}
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/////////////////////////////////////////////////////////////////////
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