97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
#include "nes_mapper.h"
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u8 map75_regs[2];
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// Mapper 75
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void MAP75_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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map75_regs[0] = 0;
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map75_regs[1] = 1;
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}
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void MAP75_MemoryWrite(uint16 addr, uint8 data)
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{
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switch(addr & 0xF000)
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{
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case 0x8000:
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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 0x9000:
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{
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if(data & 0x01)
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{
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set_mirroring(0,0,1,1);//ËŽĆ˝žľĎńInfoNES_Mirroring( 0 ); //0011
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//set_mirroring(NES_PPU::MIRROR_HORIZ);
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}
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else
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{
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set_mirroring(0,1,0,1);//´šÖąžľĎńInfoNES_Mirroring( 1 ); //0101
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//set_mirroring(NES_PPU::MIRROR_VERT);
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}
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map75_regs[0] = (map75_regs[0] & 0x0F) | ((data & 0x02) << 3);
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set_PPU_bank0(map75_regs[0]*4+0);
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set_PPU_bank1(map75_regs[0]*4+1);
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set_PPU_bank2(map75_regs[0]*4+2);
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set_PPU_bank3(map75_regs[0]*4+3);
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map75_regs[1] = (map75_regs[1] & 0x0F) | ((data & 0x04) << 2);
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set_PPU_bank4(map75_regs[1]*4+0);
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set_PPU_bank5(map75_regs[1]*4+1);
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set_PPU_bank6(map75_regs[1]*4+2);
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set_PPU_bank7(map75_regs[1]*4+3);
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}
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break;
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case 0xA000:
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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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case 0xC000:
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{
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set_CPU_bank6(data);
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}
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break;
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case 0xE000:
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{
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map75_regs[0] = (map75_regs[0] & 0x10) | (data & 0x0F);
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set_PPU_bank0(map75_regs[0]*4+0);
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set_PPU_bank1(map75_regs[0]*4+1);
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set_PPU_bank2(map75_regs[0]*4+2);
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set_PPU_bank3(map75_regs[0]*4+3);
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}
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break;
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case 0xF000:
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{
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map75_regs[1] = (map75_regs[1] & 0x10) | (data & 0x0F);
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set_PPU_bank4(map75_regs[1]*4+0);
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set_PPU_bank5(map75_regs[1]*4+1);
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set_PPU_bank6(map75_regs[1]*4+2);
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set_PPU_bank7(map75_regs[1]*4+3);
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}
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break;
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}
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}
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void MAP75_Init()
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{
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NES_Mapper->Reset = MAP75_Reset;
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NES_Mapper->Write = MAP75_MemoryWrite;
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}
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