45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
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#ifdef _NES_MAPPER_CPP_
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/////////////////////////////////////////////////////////////////////
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// Mapper 46
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void NES_mapper46::Reset()
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{
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regs[0] = regs[1] = regs[2] = regs[3] = 0;
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set_rom_banks();
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set_mirroring(NES_PPU::MIRROR_VERT);
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}
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void NES_mapper46::MemoryWriteSaveRAM(uint32 addr, uint8 data)
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{
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regs[0] = data & 0x0F;
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regs[1] = (data & 0xF0) >> 4;
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set_rom_banks();
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}
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void NES_mapper46::MemoryWrite(uint32 addr, uint8 data)
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{
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regs[2] = data & 0x01;
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regs[3] = (data & 0x70) >> 4;
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set_rom_banks();
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}
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void NES_mapper46::set_rom_banks()
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{
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set_CPU_bank4(regs[0]*8+regs[2]*4+0);
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set_CPU_bank5(regs[0]*8+regs[2]*4+1);
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set_CPU_bank6(regs[0]*8+regs[2]*4+2);
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set_CPU_bank7(regs[0]*8+regs[2]*4+3);
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set_PPU_bank0(regs[1]*64+regs[3]*8+0);
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set_PPU_bank1(regs[1]*64+regs[3]*8+1);
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set_PPU_bank2(regs[1]*64+regs[3]*8+2);
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set_PPU_bank3(regs[1]*64+regs[3]*8+3);
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set_PPU_bank4(regs[1]*64+regs[3]*8+4);
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set_PPU_bank5(regs[1]*64+regs[3]*8+5);
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set_PPU_bank6(regs[1]*64+regs[3]*8+6);
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set_PPU_bank7(regs[1]*64+regs[3]*8+7);
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}
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/////////////////////////////////////////////////////////////////////
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#endif
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