75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
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/////////////////////////////////////////////////////////////////////
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// Mapper 236
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void NES_mapper236::Reset()
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{
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set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
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bank = mode = 0;
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}
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void NES_mapper236::MemoryWrite(uint32 addr, uint8 data)
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{
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if(0x8000 <= addr && addr <= 0xbfff)
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{
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bank = ((addr & 0x03) << 4) | (bank & 0x07);
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}
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else
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{
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bank = (addr & 0x07) | (bank & 0x30);
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mode = addr & 0x30;
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}
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if(addr & 0x20)
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{
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set_mirroring(NES_PPU::MIRROR_HORIZ);
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}
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else
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{
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set_mirroring(NES_PPU::MIRROR_VERT);
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}
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switch(mode)
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{
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case 0x00:
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{
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bank |= 0x08;
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set_CPU_bank4(bank*2+0);
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set_CPU_bank5(bank*2+1);
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set_CPU_bank6((bank|0x07)*2+0);
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set_CPU_bank7((bank|0x07)*2+1);
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}
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break;
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case 0x10:
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{
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bank &= 0x37;
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set_CPU_bank4(bank*2+0);
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set_CPU_bank5(bank*2+1);
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set_CPU_bank6((bank|0x07)*2+0);
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set_CPU_bank7((bank|0x07)*2+1);
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}
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break;
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case 0x20:
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{
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bank |= 0x08;
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set_CPU_bank4((bank&0xfe)*2+0);
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set_CPU_bank5((bank&0xfe)*2+1);
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set_CPU_bank6((bank&0xfe)*2+2);
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set_CPU_bank7((bank&0xfe)*2+3);
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}
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break;
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case 0x30:
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{
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bank |= 0x08;
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set_CPU_bank4(bank*2+0);
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set_CPU_bank5(bank*2+1);
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set_CPU_bank6(bank*2+0);
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set_CPU_bank7(bank*2+1);
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}
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break;
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}
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}
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/////////////////////////////////////////////////////////////////////
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