The following hex values are known to be legitimate CIO commands.
Most handlers:
03 -- OPEN 05 -- GET RECORD 07 -- GET CHARACTERS 09 -- PUT RECORD 0B -- PUT CHARACTERS 0C -- CLOSE 0D -- GET STATUS
Display Handler only:
11 -- FILL 12 -- DRAW
Diskette File Manager only:
20 -- RENAME 21 -- DELETE 22 -- FORMAT 23 -- LOCK 24 -- UNLOCK 25 -- POINT 26 -- NOTE