content: /*
   * HalfNES by Andrew Hoffman
   * Licensed under the GNU GPL Version 3. See LICENSE file
   */
  package com.grapeshot.halfnes.mappers;
  
  public class Sunsoft01Mapper extends Mapper {
  
      private int lowBank = 0;
      private int highBank = 0;
  
      @Override
      public void loadrom() throws BadMapperException {
          //needs to be in every mapper. Fill with initial cfg
          super.loadrom();
          for (int i = 0; i < 32; ++i) {
              prg_map[i] = (1024 * i) & (prgsize - 1);
          }
          for (int i = 0; i < 8; ++i) {
              chr_map[i] = (1024 * i) & (chrsize - 1);
          }
      }
  
      @Override
      public final void cartWrite(int addr, int data) {
          if (addr >= 0x6000 && addr < 0x8000) {
              lowBank = data & 7;
              highBank = (data >> 4) & 7;
  
              //remap CHR bank 0
              for (int i = 0; i < 4; ++i) {
                  chr_map[i] = (1024 * (i + lowBank * 4)) % chrsize;
              }
              //remap CHR bank 1
              for (int i = 0; i < 4; ++i) {
                  chr_map[4 + i] = (1024 * (i + highBank * 4)) % chrsize;
              }
          }
      }
  }
  