89 lines
1.2 KiB
C++
89 lines
1.2 KiB
C++
#include "nes_mapper.h"
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u8 map76_regs[1];
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// Mapper 76
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void MAP76_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 >= 8)
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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 MAP76_MemoryWrite(uint16 addr, uint8 data)
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{
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if(addr == 0x8000)
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{
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map76_regs[0] = data;
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}
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else if(addr == 0x8001)
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{
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switch(map76_regs[0] & 0x07)
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{
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case 0x02:
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{
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set_PPU_bank0(data*2+0);
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set_PPU_bank1(data*2+1);
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}
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break;
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case 0x03:
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{
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set_PPU_bank2(data*2+0);
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set_PPU_bank3(data*2+1);
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}
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break;
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case 0x04:
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{
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set_PPU_bank4(data*2+0);
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set_PPU_bank5(data*2+1);
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}
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break;
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case 0x05:
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{
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set_PPU_bank6(data*2+0);
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set_PPU_bank7(data*2+1);
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}
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break;
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case 0x06:
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{
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set_CPU_bank4(data);
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}
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break;
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case 0x07:
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{
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set_CPU_bank5(data);
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}
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break;
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}
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}
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}
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void MAP76_Init()
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{
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NES_Mapper->Reset = MAP76_Reset;
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NES_Mapper->Write = MAP76_MemoryWrite;
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}
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