55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
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/////////////////////////////////////////////////////////////////////
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// Mapper 41
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void NES_mapper41::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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// set PPU bank pointers
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if(num_1k_VROM_banks)
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{
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set_PPU_banks(0,1,2,3,4,5,6,7);
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}
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}
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void NES_mapper41::MemoryWriteSaveRAM(uint32 addr, uint8 data)
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{
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if(addr < 0x6800)
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{
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regs[0] = (uint8)(addr & 0xFF);
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set_CPU_bank4((regs[0] & 0x07)*4+0);
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set_CPU_bank5((regs[0] & 0x07)*4+1);
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set_CPU_bank6((regs[0] & 0x07)*4+2);
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set_CPU_bank7((regs[0] & 0x07)*4+3);
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if(regs[0] & 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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}
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}
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void NES_mapper41::MemoryWrite(uint32 addr, uint8 data)
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{
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if(regs[0] & 0x04)
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{
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uint8 chr_bank = ((regs[0] & 0x18) >> 1) | (data & 0x03);
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set_PPU_bank0(chr_bank*8+0);
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set_PPU_bank1(chr_bank*8+1);
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set_PPU_bank2(chr_bank*8+2);
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set_PPU_bank3(chr_bank*8+3);
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set_PPU_bank4(chr_bank*8+4);
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set_PPU_bank5(chr_bank*8+5);
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set_PPU_bank6(chr_bank*8+6);
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set_PPU_bank7(chr_bank*8+7);
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}
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}
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/////////////////////////////////////////////////////////////////////
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