75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
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/////////////////////////////////////////////////////////////////////
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// Mapper 237
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void NES_mapper237::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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set_PPU_banks(0,1,2,3,4,5,6,7);
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}
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void NES_mapper237::MemoryWrite(uint32 addr, uint8 data)
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{
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if(addr & 0x4000)
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{
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if((addr & 0x0030) == 0x00)
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{
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set_CPU_bank4((addr&0x07)*2+0);
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set_CPU_bank5((addr&0x07)*2+1);
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set_CPU_bank6(num_8k_ROM_banks-2);
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set_CPU_bank7(num_8k_ROM_banks-1);
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}
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else if((addr & 0x0030) == 0x10)
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{
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for(uint32 i = 0; i < 0x2000; i++)
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{
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wram[i+0x0000] = ROM_banks[((addr&0x07)*2+0)*0x2000+(i&0x1ff0)+0x0d]; // 0x0b?
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wram[i+0x2000] = ROM_banks[((addr&0x07)*2+1)*0x2000+(i&0x1ff0)+0x0d]; // 0x0b?
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wram[i+0x4000] = ROM_banks[(num_8k_ROM_banks-2)*0x2000+(i&0x1ff0)+0x0d]; // 0x0b?
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wram[i+0x6000] = ROM_banks[(num_8k_ROM_banks-1)*0x2000+(i&0x1ff0)+0x0d]; // 0x0b?
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}
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NES_6502::Context context;
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parent_NES->cpu->GetContext(&context);
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context.mem_page[4] = wram + 0x0000;
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context.mem_page[5] = wram + 0x2000;
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context.mem_page[6] = wram + 0x4000;
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context.mem_page[7] = wram + 0x6000;
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parent_NES->cpu->SetContext(&context);
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}
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else if((addr & 0x0030) == 0x20)
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{
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set_CPU_bank4((addr&0x06)*2+0);
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set_CPU_bank5((addr&0x06)*2+1);
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set_CPU_bank6((addr&0x06)*2+2);
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set_CPU_bank7((addr&0x06)*2+3);
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}
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else if((addr & 0x0030) == 0x30)
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{
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set_CPU_bank4((addr&0x07)*2+0);
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set_CPU_bank5((addr&0x07)*2+1);
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set_CPU_bank6((addr&0x07)*2+0);
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set_CPU_bank7((addr&0x07)*2+1);
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}
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}
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else
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{
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if(addr & 0x0020)
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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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set_PPU_bank0((addr&0x07)*8+0);
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set_PPU_bank1((addr&0x07)*8+1);
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set_PPU_bank2((addr&0x07)*8+2);
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set_PPU_bank3((addr&0x07)*8+3);
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set_PPU_bank4((addr&0x07)*8+4);
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set_PPU_bank5((addr&0x07)*8+5);
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set_PPU_bank6((addr&0x07)*8+6);
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set_PPU_bank7((addr&0x07)*8+7);
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}
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}
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/////////////////////////////////////////////////////////////////////
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