return null;
return super.readByte(offset, length);
    public byte[] readByte(int offset, int length)    {        byte[] returnValue = new byte[length];        try        {            //OK to not end up going to read function?            System.arraycopy(rom, offset, returnValue, 0, length);        }        catch (IndexOutOfBoundsException e)        {            return null;        }        return returnValue;    }