79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
#ifdef _NES_MAPPER_CPP_
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/////////////////////////////////////////////////////////////////////
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// Mapper 57
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void NES_mapper57::Reset()
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{
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set_CPU_banks(0,1,0,1);
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set_PPU_banks(0,1,2,3,4,5,6,7);
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regs[0] = 0;
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}
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void NES_mapper57::MemoryWrite(uint32 addr, uint8 data)
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{
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switch(addr)
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{
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case 0x8000:
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case 0x8001:
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case 0x8002:
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case 0x8003:
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{
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if(data & 0x40)
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{
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set_PPU_bank0(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 0);
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set_PPU_bank1(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 1);
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set_PPU_bank2(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 2);
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set_PPU_bank3(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 3);
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set_PPU_bank4(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 4);
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set_PPU_bank5(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 5);
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set_PPU_bank6(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 6);
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set_PPU_bank7(8 * ((data & 0x03) + ((regs[0] & 0x10) >> 1) + (regs[0] & 0x07)) + 7);
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}
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}
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break;
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case 0x8800:
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{
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regs[0] = data;
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if(data & 0x80)
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{
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set_CPU_bank4(4 * ((data & 0x40) >> 6) + 8 + 0);
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set_CPU_bank5(4 * ((data & 0x40) >> 6) + 8 + 1);
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set_CPU_bank6(4 * ((data & 0x40) >> 6) + 8 + 2);
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set_CPU_bank7(4 * ((data & 0x40) >> 6) + 8 + 3);
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}
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else
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{
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set_CPU_bank4(2 * ((data & 0x60) >> 5) + 0);
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set_CPU_bank5(2 * ((data & 0x60) >> 5) + 1);
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set_CPU_bank6(2 * ((data & 0x60) >> 5) + 0);
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set_CPU_bank7(2 * ((data & 0x60) >> 5) + 1);
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}
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set_PPU_bank0(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 0);
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set_PPU_bank1(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 1);
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set_PPU_bank2(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 2);
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set_PPU_bank3(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 3);
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set_PPU_bank4(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 4);
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set_PPU_bank5(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 5);
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set_PPU_bank6(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 6);
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set_PPU_bank7(8 * ((data & 0x07) + ((data & 0x10) >> 1)) + 7);
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if(data & 0x08)
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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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break;
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}
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}
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/////////////////////////////////////////////////////////////////////
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#endif
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