player/Project/Src/NES/mapper/076.cpp

#include "nes_mapper.h"


u8 map76_regs[1];

// Mapper 76
void MAP76_Reset()
{
  // set CPU bank pointers
 // set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);

  // set PPU bank pointers
  if(num_1k_VROM_banks >= 8)
  {
    set_PPU_banks(0,1,2,3,4,5,6,7);
  }
}

void MAP76_MemoryWrite(uint16 addr, uint8 data)
{
  if(addr == 0x8000)
  {
    map76_regs[0] = data;
  }
  else if(addr == 0x8001)
  {
    switch(map76_regs[0] & 0x07)
    {
      case 0x02:
        {
          set_PPU_bank0(data*2+0);
          set_PPU_bank1(data*2+1);
        }
        break;

      case 0x03:
        {
          set_PPU_bank2(data*2+0);
          set_PPU_bank3(data*2+1);
        }
        break;

      case 0x04:
        {
          set_PPU_bank4(data*2+0);
          set_PPU_bank5(data*2+1);
        }
        break;

      case 0x05:
        {
          set_PPU_bank6(data*2+0);
          set_PPU_bank7(data*2+1);
        }
        break;

      case 0x06:
        {
          set_CPU_bank4(data);
        }
        break;

      case 0x07:
        {
          set_CPU_bank5(data);
        }
        break;
    }
  }
}
void MAP76_Init()
{
	NES_Mapper->Reset = MAP76_Reset;
	NES_Mapper->Write = MAP76_MemoryWrite; 
}