| 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 |
| CATALOG | Display disk's contents |
| CLOSE f | Stop reading or writing a text file |
| DELETE f | Delete file f from disk |
| EXEC f | Execute text file f |
| FP | Clear memory; switch to Applesoft BASIC |
| IN#n | Take input from Slot n |
| INIT f | Erase and format a disk |
| INT | Switch to Integer BASIC; clear memory |
| LOAD f | Load a file from disk |
| LOCK f | Protect a file from alteration |
| MAXFILES n | Reserve n file buffers (1-16) |
| MON C,I,O | Display disk functions |
| NOMON C,I,O | Cancel MON |
| 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 |
| READ f | Initiate reading a disk text file |
| RENAME f1,f2 | Rename a file on disk |
| RUN f | Load and execute program from disk |
| SAVE f | Save program to disk |
| UNLOCK f | Cancel LOCK |
| VERIFY f | Verify a file on disk |
| WRITE f | Initiate writing to a disk text file |
| Control-D | CHR$(4) - DOS command character |