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From: msschaa@cs.vu.nl (Schaap MS)
Newsgroups: comp.sys.ibm.pc
Subject: Re: DEBUG bug
Message-ID: <2611@solo3.cs.vu.nl>
Date: 25 May 89 10:38:53 GMT
References: <514@philmtl.philips.ca>
Reply-To: msschaa@cs.vu.nl (Schaap MS)
Organization: VU Informatica, Amsterdam
Lines: 20

In article <514@philmtl.philips.ca> ray@philmtl.UUCP (Raymond Dunn) writes:
>Go into DEBUG and enter and *trace* through the following instructions with
>DEBUG on an 80286 or 80386 based system:
>
>           MOV   BX,FFFF
>           MOV   AL,[BX]
>
>In trying to display the data contents DEBUG accesses a *word* and causes a
>segment overflow trap which hangs the machine!
>

I don't know if it works, but it's worth a try.


Try
            MOV   BX,FFFF
            MOV   AL, BYTE PTR [BX]


                              Michael