| KERNAL message | BASIC message | Code (hex, dec) | Exec address | |
|---|---|---|---|---|
| I/O ERROR #1 | TOO MANY FILES | $01 | 1 | $F6FB |
| I/O ERROR #2 | FILE OPEN | $02 | 2 | $F6FE |
| I/O ERROR #3 | FILE NOT OPEN | $03 | 3 | $F701 |
| I/O ERROR #4 | FILE NOT FOUND | $04 | 4 | $F704 |
| I/O ERROR #5 | DEVICE NOT PRESENT | $05 | 5 | $F707 |
| I/O ERROR #6 | NOT INPUT FILE | $06 | 6 | $F70A |
| I/O ERROR #7 | NOT OUTPUT FILE | $07 | 7 | $F70D |
| I/O ERROR #8 | MISSING FILENAME | $08 | 8 | $F710 |
| I/O ERROR #9 | ILLEGAL DEVICE NUMBER | $09 | 9 | $F713 |