| 401 | MONOCHROME Monochrome memory test, video, or horizontal sync frequency test |
| 408 | MONOCHROME User indicated display attributes failure. |
| 416 | MONOCHROME User indicated character set failure. |
| 424 | MONOCHROME User indicated 80X25 mode failure. |
| 432 | MONOCHROME Parallel port test failed (monochrome adapter). |