50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
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/////////////////////////////////////////////////////////////////////
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// Mapper 96
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void NES_mapper96::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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vbank0 = vbank1 = 0;
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sync_PPU_banks();
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parent_NES->ppu->vram_size = 0x8000;
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set_mirroring(0,0,0,0);
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}
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void NES_mapper96::PPU_Latch_Address(uint32 addr)
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{
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if((addr & 0xF000) == 0x2000)
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{
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vbank1 = (addr & 0x0300) >> 8;
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sync_PPU_banks();
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}
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}
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void NES_mapper96::MemoryWrite(uint32 addr, uint8 data)
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{
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set_CPU_bank4((data & 0x03) * 4 + 0);
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set_CPU_bank5((data & 0x03) * 4 + 1);
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set_CPU_bank6((data & 0x03) * 4 + 2);
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set_CPU_bank7((data & 0x03) * 4 + 3);
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vbank0 = (data & 0x04) >> 2;
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sync_PPU_banks();
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}
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void NES_mapper96::sync_PPU_banks()
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{
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set_VRAM_bank(0, vbank0 * 16 + vbank1 * 4 + 0);
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set_VRAM_bank(1, vbank0 * 16 + vbank1 * 4 + 1);
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set_VRAM_bank(2, vbank0 * 16 + vbank1 * 4 + 2);
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set_VRAM_bank(3, vbank0 * 16 + vbank1 * 4 + 3);
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set_VRAM_bank(4, vbank0 * 16 + 12);
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set_VRAM_bank(5, vbank0 * 16 + 13);
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set_VRAM_bank(6, vbank0 * 16 + 14);
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set_VRAM_bank(7, vbank0 * 16 + 15);
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}
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/////////////////////////////////////////////////////////////////////
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