137 lines
2.5 KiB
C++
137 lines
2.5 KiB
C++
#ifdef _NES_MAPPER_CPP_
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/////////////////////////////////////////////////////////////////////
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// Mapper 243
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void NES_mapper243::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 > 32)
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{
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set_PPU_banks(24,25,26,27,28,29,30,31);
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}
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set_mirroring(NES_PPU::MIRROR_HORIZ);
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regs[0] = 0;
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regs[1] = 0;
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regs[2] = 3;
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regs[3] = 0;
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}
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void NES_mapper243::MemoryWriteLow(uint32 addr, uint8 data)
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{
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if((addr & 0x4101) == 0x4100)
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{
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regs[0] = data;
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}
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else if((addr & 0x4101) == 0x4101)
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{
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switch(regs[0] & 0x07)
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{
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case 0:
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{
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regs[1] = 0;
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regs[2] = 3;
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}
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break;
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case 4:
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{
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regs[2] = (regs[2] & 0x06) | (data & 0x01);
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}
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break;
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case 5:
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{
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regs[1] = data & 0x01;
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}
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break;
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case 6:
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{
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regs[2] = (regs[2] & 0x01) | ((data & 0x03) << 1);
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}
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break;
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case 7:
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{
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regs[3] = data & 1;
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}
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break;
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}
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set_CPU_banks(regs[1]*4+0, regs[1]*4+1, regs[1]*4+2, regs[1]*4+3);
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set_PPU_banks(regs[2]*8+0, regs[2]*8+1, regs[2]*8+2, regs[2]*8+3,
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regs[2]*8+4, regs[2]*8+5, regs[2]*8+6, regs[2]*8+7);
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if(regs[3])
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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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}
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}
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void NES_mapper243::MemoryWriteSaveRAM(uint32 addr, uint8 data)
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{
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if((addr & 0x4101) == 0x4100)
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{
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regs[0] = data;
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}
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else if((addr & 0x4101) == 0x4101)
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{
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switch(regs[0] & 0x07)
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{
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case 0:
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{
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regs[1] = 0;
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regs[2] = 3;
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}
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break;
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case 4:
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{
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regs[2] = (regs[2] & 0x06) | (data & 0x01);
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}
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break;
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case 5:
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{
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regs[1] = data & 0x01;
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}
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break;
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case 6:
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{
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regs[2] = (regs[2] & 0x01) | ((data & 0x03) << 1);
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}
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break;
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case 7:
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{
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regs[3] = data & 1;
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}
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break;
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}
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set_CPU_banks(regs[1]*4+0, regs[1]*4+1, regs[1]*4+2, regs[1]*4+3);
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set_PPU_banks(regs[2]*8+0, regs[2]*8+1, regs[2]*8+2, regs[2]*8+3,
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regs[2]*8+4, regs[2]*8+5, regs[2]*8+6, regs[2]*8+7);
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if(regs[3])
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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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}
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}
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/////////////////////////////////////////////////////////////////////
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#endif
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