Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!cbmehq!cbmger!peterk
From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.tech
Subject: Re: How to LOCK your Amiga?
Message-ID: <701@cbmger.UUCP>
Date: 8 Jan 91 09:22:56 GMT
References: <1991Jan6.233133.1@csc.fi>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 29

In article <1991Jan6.233133.1@csc.fi> rronkko@csc.fi writes:
>
>1) A 'special' diskette, which can be locked into the diskette drive 
>(I suppose the ones sold for PC:s can be used also in Amiga?). There is, 
>however, a couple of problems: IF the lock-diskette is non-bootable, then 
>the machine will boot from my autobooting Hard Disk, and the lock-diskette 
>is useless. On the other hand, IF the locking diskette is bootable, a
>skilled 'unauthorized user' would eventually find his way to my auto-
>mountable HD from the cli prompt, which he will reach with the Ctrl-D, even 
>if I use some password software on the lock-diskette.
>
>So, my question is: Is there any way to make this lock-diskette to crash or 
>lock the machine BEFORE the startup-sequence is executed and the CLI prompt
>is available with Ctrl-D?  

There should be a way: Modify the little program that is in the
bootblock of an INSTALLed disk. I didn't try this, but how about
changing that finishing JMP (or ist it JSR?) to BRA to itself,
running an infinite loop? (I fear you also would have to adjust 
a checksum on that block.)

But the other problem with this is that I don't believe you can
get lock-diskettes with real media in them. The only ones I know
can't be used for two reasons: a) they are solid plastic plus a
little metal; b) they fit mechanically only into IBM PS/2 drives.

-- 
Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk