| DOS Errors |
 | 1 | Invalid function number |
| 2 | File not found |
| 3 | Path not found |
| 4 | Too many open files |
| 5 | File access denied |
| 6 | Invalid file handle |
| 7 | Memory control block destroyed |
| 8 | Insufficient memory |
| 9 | Memory block address invalid |
| 10 | Environment invalid |
| 11 | Format invalid |
| 12 | Invalid file access code |
| 13 | Data invalid |
| 14 | Unknown unit |
| 15 | Invalid drive number |
| 16 | Cannot remove current directory |
| 17 | Cannot rename across drives |
| 18 | No more files |
| I/O Errors |
| 100 | Disk read error |
| 101 | Disk write error |
| 102 | File not assigned |
| 103 | File not open |
| 104 | File not open for input |
| 105 | File not open for output |
| 106 | Invalid numeric format |
| Critical Errors |
| 150 | Disk is write-protected |
| 151 | Unknown unit |
| 152 | Drive not ready |
| 153 | Unknown command |
| 154 | CRC error in data |
| 155 | Bad drive request structure length |
| 156 | Disk seek error |
| 157 | Unknown media type |
| 158 | Sector not found |
| 159 | Printer out of paper |
| 160 | Device write fault |
| 161 | Device read fault |
| 162 | Hardware failure |
| Extended Critical Errors |
| 163 | Sharing violation |
| 164 | Lock violation |
| 165 | Disk change invalid |
| 166 | FCB unavailable |
| 167 | Sharing buffer exceeded |
| Fatal Errors |
| 200 | Division by zero |
| 201 | Range check error |
| 202 | Stack overflow error |
| 203 | Heap overflow error |
| 204 | Invalid pointer operation |
| 205 | Floating point overflow |
| 206 | Floating point underflow |
| 207 | Invalid floating point operation |
| 208 | Overlay manager not installed |
| 209 | Overlay file read error |
| 210 | Object not initialized |
| 211 | Call to abstract method |
| 212 | Stream registration error |
| 213 | Collection index out of range |
| 214 | Collection overflow error |
| 215 | Arithmetic overflow error |
| 216 | General Protection fault |
