53 lines
880 B
C++
53 lines
880 B
C++
#include "nes_mapper.h"
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// Mapper 79
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void MAP79_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)
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{
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set_PPU_banks(0,1,2,3,4,5,6,7);
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}
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}
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void MAP79_MemoryWriteLow(uint16 addr, uint8 data)
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{
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if(addr & 0x0100)
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{
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uint8 prg_bank = (data & 0x08) >> 3;
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uint8 chr_bank = data & 0x07;
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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_PPU_bank0(chr_bank*8+0);
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set_PPU_bank1(chr_bank*8+1);
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set_PPU_bank2(chr_bank*8+2);
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set_PPU_bank3(chr_bank*8+3);
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set_PPU_bank4(chr_bank*8+4);
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set_PPU_bank5(chr_bank*8+5);
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set_PPU_bank6(chr_bank*8+6);
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set_PPU_bank7(chr_bank*8+7);
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}
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}
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void MAP79_Init()
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{
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NES_Mapper->Reset = MAP79_Reset;
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NES_Mapper->WriteLow=MAP79_MemoryWriteLow;
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}
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