content: /*
   * HalfNES by Andrew Hoffman
   * Licensed under the GNU GPL Version 3. See LICENSE file
   */
  package com.grapeshot.halfnes.mappers;
  
  public class UnromMapper extends Mapper {
  
      private int bank = 0x0;
  
      @Override
      public void loadrom() throws BadMapperException {
          //needs to be in every mapper. Fill with initial cfg
          super.loadrom();
          //movable bank, should really be random. eh, effort
          for (int i = 0; i < 16; ++i) {
              prg_map[i] = (1024 * i) & (prgsize - 1);
          }
          //fixed bank
          for (int i = 1; i <= 16; ++i) {
              prg_map[32 - i] = prgsize - (1024 * i);
          }
          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 < 0x8000 || addr > 0xffff) {
              super.cartWrite(addr, data);
              return;
          }
          bank = data & 0xf;
          //remap PRG bank (1st bank switchable, 2nd bank mapped to LAST bank)
          for (int i = 0; i < 16; ++i) {
              prg_map[i] = (1024 * (i + 16 * bank)) & (prgsize - 1);
          }
      }
  }
  