void CartridgeAR::bankConfiguration()

in atari_py/ale_interface/src/emucore/CartAR.cxx [204:294]
61 lines of code
10 McCabe index (conditional complexity)

void CartridgeAR::bankConfiguration(uInt8 configuration)
{
  // D7-D5 of this byte: Write Pulse Delay (n/a for emulator)
  //
  // D4-D0: RAM/ROM configuration:
  //       $F000-F7FF    $F800-FFFF Address range that banks map into
  //  000wp     2            ROM
  //  001wp     0            ROM
  //  010wp     2            0      as used in Commie Mutants and many others
  //  011wp     0            2      as used in Suicide Mission
  //  100wp     2            ROM
  //  101wp     1            ROM
  //  110wp     2            1      as used in Killer Satellites
  //  111wp     1            2      as we use for 2k/4k ROM cloning
  // 
  //  w = Write Enable (1 = enabled; accesses to $F000-$F0FF cause writes
  //    to happen.  0 = disabled, and the cart acts like ROM.)
  //  p = ROM Power (0 = enabled, 1 = off.)  Only power the ROM if you're
  //    wanting to access the ROM for multiloads.  Otherwise set to 1.

  myCurrentBank = configuration & 0x1f; // remember for the bank() method

  // Handle ROM power configuration
  myPower = !(configuration & 0x01);

  if(myPower)
  {
    myPowerRomCycle = mySystem->cycles();
  }

  myWriteEnabled = configuration & 0x02;

  switch((configuration >> 2) & 0x07)
  {
    case 0:
    {
      myImageOffset[0] = 2 * 2048;
      myImageOffset[1] = 3 * 2048;
      break;
    }

    case 1:
    {
      myImageOffset[0] = 0 * 2048;
      myImageOffset[1] = 3 * 2048;
      break;
    }

    case 2:
    {
      myImageOffset[0] = 2 * 2048;
      myImageOffset[1] = 0 * 2048;
      break;
    }

    case 3:
    {
      myImageOffset[0] = 0 * 2048;
      myImageOffset[1] = 2 * 2048;
      break;
    }

    case 4:
    {
      myImageOffset[0] = 2 * 2048;
      myImageOffset[1] = 3 * 2048;
      break;
    }

    case 5:
    {
      myImageOffset[0] = 1 * 2048;
      myImageOffset[1] = 3 * 2048;
      break;
    }

    case 6:
    {
      myImageOffset[0] = 2 * 2048;
      myImageOffset[1] = 1 * 2048;
      break;
    }

    case 7:
    {
      myImageOffset[0] = 1 * 2048;
      myImageOffset[1] = 2 * 2048;
      break;
    }
  }
}