| 00 | no error |
| 01 | bad command passed to driver |
| 02 | address mark not found or bad sector |
| 03 | diskette write protect error |
| 04 | sector not found |
| 05 | fixed disk reset failed |
| 06 | diskette changed or removed |
| 07 | bad fixed disk parameter table |
| 08 | DMA overrun |
| 09 | DMA access across 64k boundary |
| 0A | bad fixed disk sector flag |
| 0B | bad fixed disk cylinder |
| 0C | unsupported track/invalid media |
| 0D | invalid number of sectors on fixed disk format |
| 0E | fixed disk controlled data address mark detected |
| 0F | fixed disk DMA arbitration level out of range |
| 10 | ECC/CRC error on disk read |
| 11 | recoverable fixed disk data error, data fixed by ECC |
| 20 | controller error (NEC for floppies) |
| 40 | seek failure |
| 80 | time out, drive not ready |
| AA | fixed disk drive not ready |
| BB | fixed disk undefined error |
| CC | fixed disk write fault on selected drive |
| E0 | fixed disk status error/Error reg = 0 |
| FF | sense operation failed |