for (int y = 0; y < 16; y++) {
    for (int x = 0; x < 16; x++) {
      int i = x | (y << 4);
      instruction_t ins = decode_ins[i];
      if (x == 0)
        fprintf(stdout, "|%5s |", opcode_string[ins.opcode]);
      else
        fprintf(stdout, "%6s |", opcode_string[ins.opcode]);
    }

    fprintf(stdout, "\n");

    for (int x = 0; x < 16; x++) {
      int i = x | (y << 4);
      instruction_t ins = decode_ins[i];
      if (x == 0)
        fprintf(stdout, "|%5s |", mode_string[ins.mode]);
      else
        fprintf(stdout, "%6s |", mode_string[ins.mode]);
    }

    fprintf(stdout, "\n");

    for (int c = 0; c < 128; c++) {
      fputc('-', stdout);
    }
    fputc('\n', stdout);
  }