Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-pcd!hpcvra.cv.hp.com!rnews!hpcvbbs!akcs.xymox
From: akcs.xymox@hpcvbbs.UUCP (Kelvin Chang)
Newsgroups: comp.sys.handhelds
Subject: Protect for HP48 (attn: Bill Wickes)
Message-ID: <27fd0531:2013.1comp.sys.handhelds;1@hpcvbbs.UUCP>
Date: 5 Apr 91 23:40:12 GMT
References: <27b7409e:2013comp.sys.handhelds@hpcvbbs.UUCP>
Lines: 22

Excuse me, but I've been trying to find out more about the 'hidden'
directory, but have been unsuccessful.  Could you possible tell me more
about this interesting subject?  I have some private stuff on my 48sx
that I would like to keep private, and this would be a great way to do
that. Right now, I just have 'protection' programs that purges the stuff
right out of the memory if you press the wrong key to get to the
variable...and I don't really like that.  
Also, I don't know how to make the on-c buttons functionless, but I do
know how to keep your calculator off so that the on key can't abort the
program.  Just have a long list of OFF commands, and have some main
program access this list and evaluate it.  It will repeatedly turn the
calculator off, regardless of whether you push the on key or not.  When
the program gets to the end of the list and goes back to the beginning of
the list, however, a press of the on button during the 'interval' WILL
abort the program, which is why I recommend a LONG list of OFFs, or find
some way to keep that from happening.  Anyway, hope you find this useful,
at least amusing.

Sincerely,

Kelvin
University of Arizona