77 lines
1.1 KiB
C++
77 lines
1.1 KiB
C++
#include "nes_mapper.h"
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uint8 prg_bank;
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uint8 chr_bank;
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// Mapper 13
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void MAP13_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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set_VRAM_bank(0, 0);
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set_VRAM_bank(1, 1);
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set_VRAM_bank(2, 2);
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set_VRAM_bank(3, 3);
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set_VRAM_bank(4, 0);
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set_VRAM_bank(5, 1);
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set_VRAM_bank(6, 2);
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set_VRAM_bank(7, 3);
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// parent_NES->ppu->vram_size = 0x4000;
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prg_bank = chr_bank = 0;
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}
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void MAP13_MemoryWrite(uint16 addr, uint8 data)
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{
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prg_bank = (data & 0x30) >> 4;
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chr_bank = data & 0x03;
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set_CPU_bank4(prg_bank*4+0);
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set_CPU_bank5(prg_bank*4+1);
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set_CPU_bank6(prg_bank*4+2);
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set_CPU_bank7(prg_bank*4+3);
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set_VRAM_bank(4, chr_bank * 4 + 0);
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set_VRAM_bank(5, chr_bank * 4 + 1);
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set_VRAM_bank(6, chr_bank * 4 + 2);
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set_VRAM_bank(7, chr_bank * 4 + 3);
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}
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//void MAP13_SNSS_fixup()
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//{
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// set_VRAM_bank(4, chr_bank * 4 + 0);
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// set_VRAM_bank(5, chr_bank * 4 + 1);
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// set_VRAM_bank(6, chr_bank * 4 + 2);
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// set_VRAM_bank(7, chr_bank * 4 + 3);
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//}
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void MAP13_Init()
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{
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NES_Mapper->Reset = MAP13_Reset;
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NES_Mapper->Write = MAP13_MemoryWrite;
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}
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