79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
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/////////////////////////////////////////////////////////////////////
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// Mapper 51
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void NES_mapper51::Reset()
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{
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bank = 0;
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mode = 1;
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Sync_Prg_Banks();
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parent_NES->ppu->vram_write_protect = 0;
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}
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void NES_mapper51::MemoryWriteSaveRAM(uint32 addr, uint8 data)
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{
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mode = ((data & 0x10) >> 3) | ((data & 0x02) >> 1);
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Sync_Prg_Banks();
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}
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void NES_mapper51::MemoryWrite(uint32 addr, uint8 data)
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{
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bank = (data & 0x0f) << 2;
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if(0xC000 <= addr && addr <= 0xDFFF)
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{
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mode = (mode & 0x01) | ((data & 0x10) >> 3);
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}
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Sync_Prg_Banks();
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}
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void NES_mapper51::Sync_Prg_Banks()
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{
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switch(mode)
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{
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case 0:
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{
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set_mirroring(NES_PPU::MIRROR_VERT);
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set_CPU_bank3(bank | 0x2c | 3);
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set_CPU_bank4(bank | 0x00 | 0);
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set_CPU_bank5(bank | 0x00 | 1);
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set_CPU_bank6(bank | 0x0c | 2);
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set_CPU_bank7(bank | 0x0c | 3);
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}
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break;
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case 1:
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{
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set_mirroring(NES_PPU::MIRROR_VERT);
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set_CPU_bank3(bank | 0x20 | 3);
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set_CPU_bank4(bank | 0x00 | 0);
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set_CPU_bank5(bank | 0x00 | 1);
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set_CPU_bank6(bank | 0x00 | 2);
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set_CPU_bank7(bank | 0x00 | 3);
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}
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break;
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case 2:
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{
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set_mirroring(NES_PPU::MIRROR_VERT);
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set_CPU_bank3(bank | 0x2e | 3);
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set_CPU_bank4(bank | 0x02 | 0);
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set_CPU_bank5(bank | 0x02 | 1);
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set_CPU_bank6(bank | 0x0e | 2);
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set_CPU_bank7(bank | 0x0e | 3);
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}
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break;
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case 3:
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{
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set_mirroring(NES_PPU::MIRROR_HORIZ);
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set_CPU_bank3(bank | 0x20 | 3);
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set_CPU_bank4(bank | 0x00 | 0);
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set_CPU_bank5(bank | 0x00 | 1);
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set_CPU_bank6(bank | 0x00 | 2);
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set_CPU_bank7(bank | 0x00 | 3);
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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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