Path: utzoo!utgpu!watmath!maytag!watstat!dmurdoch
From: dmurdoch@watstat.waterloo.edu (Duncan Murdoch)
Newsgroups: comp.sys.ibm.pc
Subject: Re: null pointer assignment?
Keywords: null pointer, R6001, run-time error
Message-ID: <50@maytag.waterloo.edu>
Date: 22 Feb 89 13:45:29 GMT
References: <1413@cod.NOSC.MIL> <977@optilink.UUCP>
Sender: daemon@maytag.waterloo.edu
Reply-To: dmurdoch@watstat.waterloo.edu (Duncan Murdoch)
Organization: U. of Waterloo, Ontario
Lines: 16

In article <977@optilink.UUCP> cramer@optilink.UUCP (Clayton Cramer) writes:

... stuff deleted ...

>What this message means is that when the program got ready to exit,
>it found that someone had altered the Microsoft copyright message
>at DS:0.  The slowest but easiest way to find this program with 
>CodeView is to set up a tracepoint like this:
>
>    TPB DS:0 l20

If he can find a 386, he should get Turbo Debugger and use a hardware 
breakpoint.  His program will run at full speed, but screech to a halt if 
anybody touches DS:0.

Duncan Murdoch