void CartridgeAR::initializeROM()

in atari_py/ale_interface/src/emucore/CartAR.cxx [297:363]

• 57 lines of code
• 4 McCabe index (conditional complexity)

void CartridgeAR::initializeROM(bool fastbios)
{
  static uInt8 dummyROMCode[] = {
    0xa5, 0xfa, 0x85, 0x80, 0x4c, 0x18, 0xf8, 0xff, 
    0xff, 0xff, 0x78, 0xd8, 0xa0, 0x0, 0xa2, 0x0, 
    0x94, 0x0, 0xe8, 0xd0, 0xfb, 0x4c, 0x50, 0xf8, 
    0xa2, 0x0, 0xbd, 0x6, 0xf0, 0xad, 0xf8, 0xff, 
    0xa2, 0x0, 0xad, 0x0, 0xf0, 0xea, 0xbd, 0x0, 
    0xf7, 0xca, 0xd0, 0xf6, 0x4c, 0x50, 0xf8, 0xff, 
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
    0xa2, 0x3, 0xbc, 0x1d, 0xf9, 0x94, 0xfa, 0xca, 
    0x10, 0xf8, 0xa0, 0x0, 0xa2, 0x28, 0x94, 0x4, 
    0xca, 0x10, 0xfb, 0xa2, 0x1c, 0x94, 0x81, 0xca, 
    0x10, 0xfb, 0xa9, 0x0, 0x85, 0x1b, 0x85, 0x1c, 
    0x85, 0x1d, 0x85, 0x1e, 0x85, 0x1f, 0x85, 0x19, 
    0x85, 0x1a, 0x85, 0x8, 0x85, 0x1, 0xa9, 0x10, 
    0x85, 0x21, 0x85, 0x2, 0xa2, 0x7, 0xca, 0xca, 
    0xd0, 0xfd, 0xa9, 0x0, 0x85, 0x20, 0x85, 0x10, 
    0x85, 0x11, 0x85, 0x2, 0x85, 0x2a, 0xa9, 0x5, 
    0x85, 0xa, 0xa9, 0xff, 0x85, 0xd, 0x85, 0xe, 
    0x85, 0xf, 0x85, 0x84, 0x85, 0x85, 0xa9, 0xf0, 
    0x85, 0x83, 0xa9, 0x74, 0x85, 0x9, 0xa9, 0xc, 
    0x85, 0x15, 0xa9, 0x1f, 0x85, 0x17, 0x85, 0x82, 
    0xa9, 0x7, 0x85, 0x19, 0xa2, 0x8, 0xa0, 0x0, 
    0x85, 0x2, 0x88, 0xd0, 0xfb, 0x85, 0x2, 0x85, 
    0x2, 0xa9, 0x2, 0x85, 0x2, 0x85, 0x0, 0x85, 
    0x2, 0x85, 0x2, 0x85, 0x2, 0xa9, 0x0, 0x85, 
    0x0, 0xca, 0x10, 0xe4, 0x6, 0x83, 0x66, 0x84, 
    0x26, 0x85, 0xa5, 0x83, 0x85, 0xd, 0xa5, 0x84, 
    0x85, 0xe, 0xa5, 0x85, 0x85, 0xf, 0xa6, 0x82, 
    0xca, 0x86, 0x82, 0x86, 0x17, 0xe0, 0xa, 0xd0, 
    0xc3, 0xa9, 0x2, 0x85, 0x1, 0xa2, 0x1c, 0xa0, 
    0x0, 0x84, 0x19, 0x84, 0x9, 0x94, 0x81, 0xca, 
    0x10, 0xfb, 0xa6, 0x80, 0xdd, 0x0, 0xf0, 0xa5, 
    0x80, 0x45, 0xfe, 0x45, 0xff, 0xa2, 0xff, 0xa0, 
    0x0, 0x9a, 0x4c, 0xfa, 0x0, 0xcd, 0xf8, 0xff, 
    0x4c
  };

  // If fastbios is enabled, set the wait time between vertical bars
  // to 0 (default is 8), which is stored at address 189 of the bios
  if(fastbios)
    dummyROMCode[189] = 0x0;

  uInt32 size = sizeof(dummyROMCode);

  // Initialize ROM with illegal 6502 opcode that causes a real 6502 to jam
  for(uInt32 i = 0; i < 2048; ++i)
  {
    myImage[3 * 2048 + i] = 0x02; 
  }

  // Copy the "dummy" Supercharger BIOS code into the ROM area
  for(uInt32 j = 0; j < size; ++j)
  {
    myImage[3 * 2048 + j] = dummyROMCode[j];
  }

  // Finally set 6502 vectors to point to initial load code at 0xF80A of BIOS
  myImage[3 * 2048 + 2044] = 0x0A;
  myImage[3 * 2048 + 2045] = 0xF8;
  myImage[3 * 2048 + 2046] = 0x0A;
  myImage[3 * 2048 + 2047] = 0xF8;
}