Files
player/Project/Src/NES/mapper/113.cpp
2025-06-27 00:32:57 +08:00

114 lines
2.3 KiB
C++

#include "nes_mapper.h"
// Mapper 113
void MAP113_Reset()
{
// set CPU bank pointers
//set_CPU_banks(0,1,2,3);
// set PPU bank pointers
if(num_1k_VROM_banks)
{
set_PPU_banks(0,1,2,3,4,5,6,7);
}
}
void MAP113_MemoryWriteLow(uint16 addr, uint8 data)
{
switch(addr)
{
case 0x4100:
case 0x4111:
case 0x4120:
case 0x4900:
{
uint8 prg_bank, chr_bank;
prg_bank = data >> 3;
if (num_8k_ROM_banks <= 8 && num_1k_VROM_banks == 8*16)
{
chr_bank = ((data >> 3) & 0x08) + (data & 0x07);
}
else
{
chr_bank = data & 0x07;
}
//uint8 prg_bank = (data & 0x03) | ((data & 0x80) >> 5);
//uint8 chr_bank = (data & 0x70) >> 4;
set_CPU_bank4(prg_bank*4+0);
set_CPU_bank5(prg_bank*4+1);
set_CPU_bank6(prg_bank*4+2);
set_CPU_bank7(prg_bank*4+3);
set_PPU_bank0(chr_bank*8+0);
set_PPU_bank1(chr_bank*8+1);
set_PPU_bank2(chr_bank*8+2);
set_PPU_bank3(chr_bank*8+3);
set_PPU_bank4(chr_bank*8+4);
set_PPU_bank5(chr_bank*8+5);
set_PPU_bank6(chr_bank*8+6);
set_PPU_bank7(chr_bank*8+7);
}
break;
}
}
void MAP113_MemoryWrite(uint16 addr, uint8 data)
{
switch(addr)
{
case 0x8008:
case 0x8009:
{
uint8 prg_bank, chr_bank;
prg_bank = data >> 3;
if (num_8k_ROM_banks <= 8 && num_1k_VROM_banks == 8*16)
{
chr_bank = ((data >> 3) & 0x08) + (data & 0x07);
}
else
{
chr_bank = data & 0x07;
}
prg_bank = (data & 0x03) | ((data & 0x80) >> 5);
chr_bank = (data & 0x70) >> 4;
set_CPU_bank4(prg_bank*4+0);
set_CPU_bank5(prg_bank*4+1);
set_CPU_bank6(prg_bank*4+2);
set_CPU_bank7(prg_bank*4+3);
set_PPU_bank0(chr_bank*8+0);
set_PPU_bank1(chr_bank*8+1);
set_PPU_bank2(chr_bank*8+2);
set_PPU_bank3(chr_bank*8+3);
set_PPU_bank4(chr_bank*8+4);
set_PPU_bank5(chr_bank*8+5);
set_PPU_bank6(chr_bank*8+6);
set_PPU_bank7(chr_bank*8+7);
}
break;
}
}
void MAP113_Init()
{
NES_Mapper->Reset = MAP113_Reset;
NES_Mapper->Write=MAP113_MemoryWrite;
NES_Mapper->WriteLow=MAP113_MemoryWriteLow;
}