More PEEKs, POKEs and CALLing
By Grant Kwai
Copyright (c) 1990 Apple Users' Group, Sydney
Republished from Applecations, a publication of the Apple Users' Group, Sydney, Australia.
Here are some more little commands you can try out in DOS 3.3 and ProDOS. Many of these are useless, but people, like me, who like to fiddle around with DOS to see what happens, may appreciate them.
Type these pokes to display only the filename in a catalog:
POKE 44507,16:POKE 44508,54
POKE 47617,12 :Speeds disk access up.
PRINT PEEK(978) :Dos 3.3=157, ProDOS=190, Applesoft=148
POKE 50,128 :Makes CATALOG invisible.
POKE 42350,60 :Prevents CATALOG.
POKE 42350,169 :Allows CATALOG.
POKE 49384,0 :Stops drive motor.
POKE 49385,0 :Starts drive motor. (WARNING! Potentially dangerous for your data)
CALL -756 :Wait for a key press.
CALL -1370 :Boots disk.
CALL -1401 :Also boots a disk!
I may be writing an article on how to put a number of simple commands into DOS 3.3 so as to protect your disk (to an extent) from prying eyes. The technique involves a number of POKES, PEEKS and CALL routines. The best thing though is that it will be CopyA'ble. However, don't expect these to keep anyone with any knowledge of DOS from "cracking" your disk! I will write the article if demand is great enough. So if you want to know how, write me a message on the Apple // BBS or give me a call on (02)872-2758.

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