| APPEND f | Add data to a sequential text file |
| BLOAD f | Load binary file f |
| BRUN f | Load and run binary program f |
| BSAVE f,An,Lm | Save data; Address n, Length m |
| CAT | Display 40-column ProDOS disk contents |
| CATALOG | Display disk's contents |
| CHAIN f | Run file f without clearing variables |
| CLOSE f | Stop reading or writing a text file |
| CREATE f | Create a directory file |
| DELETE f | Delete file f from disk |
| EXEC f | Execute text file f |
| FLUSH | Write buffer to disk without closing file |
| FRE | Free all available memory (garbage collection) |
| IN#n | Take input from slot n |
| LOAD f | Load a file from disk |
| LOCK f | Protect a file from alteration |
| OPEN f | Begin READ or WRITE of a text file |
| POSITION f | Locate READ or WRITE in file |
| PR#n | Send output to slot n |
| PREFIX f | Change default directory |
| READ f | Initiate reading a disk text file |
| RENAME f1,f2 | Rename a file on disk |
| RESTORE f | Retrieve strings & variables from file f |
| RUN f | Load and execute program from disk |
| SAVE f | Save program to disk |
| STORE f | Store variables & strings as file f |
| UNLOCK f | Cancel LOCK |
| VERIFY f | Verify a file on disk |
| WRITE f | Initiate writing to a disk text file |
| -f | Execute file f, regardless of type |