content: package com.grapeshot.halfnes.mappers;
  
  import com.grapeshot.halfnes.*;
  
  public class Mapper62 extends Mapper {
  
      boolean prg_mode;
      int prgselect, chrselect;
  
      @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(final int addr, final int data) {
          if (addr < 0x8000 || addr > 0xffff) {
              super.cartWrite(addr, data);
              return;
          }
          prg_mode = 
          ((addr & (utils.BIT5)) != 0);
          prgselect = (addr & 0x40) | ((addr >> 8) & 0x3F);
          chrselect = (addr << 2) | (data & 3);
  
          //remap CHR bank
          for (int i = 0; i < 8; ++i) {
              chr_map[i] = (1024 * (i + 8 * chrselect)) & (chrsize - 1);
          }
          //remap PRG bank
          if (prg_mode) {
              for (int i = 0; i < 16; ++i) {
                  prg_map[i] = (1024 * (i + 16 * prgselect)) & (prgsize - 1);
              }
              for (int i = 0; i < 16; ++i) {
                  prg_map[16 + i] = (1024 * (i + 16 * prgselect)) & (prgsize - 1);
              }
          } else {
              for (int i = 0; i < 32; ++i) {
                  prg_map[i] = (1024 * (i + 32 * (prgselect >> 1))) & (prgsize - 1);
              }
          }
  
          setmirroring( 
          ((addr & (utils.BIT7)) != 0) ? MirrorType.H_MIRROR : MirrorType.V_MIRROR);
      }
  }
  