55 lines
958 B
C++
55 lines
958 B
C++
#include "nes_mapper.h"
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// Mapper 78
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void MAP78_Reset()
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{
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// set CPU bank pointers
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// set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
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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 MAP78_MemoryWrite(uint16 addr, uint8 data)
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{
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uint8 prg_bank = data & 0x0F;
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uint8 chr_bank = (data & 0xF0) >> 4;
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set_CPU_bank4(prg_bank*2+0);
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set_CPU_bank5(prg_bank*2+1);
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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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// added by rinao
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if((addr & 0xFE00) != 0xFE00)
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{
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if (data & 0x08)
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{
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set_mirroring(1,1,1,1);
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}
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else
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{
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set_mirroring(0,0,0,0);
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}
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}
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}
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void MAP78_Init()
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{
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NES_Mapper->Reset = MAP78_Reset;
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NES_Mapper->Write = MAP78_MemoryWrite;
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}
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