Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!ames!apple!oliveb!sun!token!alpope
From: alpope@token.Sun.COM (Alan Pope)
Newsgroups: comp.sys.ibm.pc
Subject: Re: DEBUG bug
Summary: Reserved Interrupts used by IBM not MS
Message-ID: <107241@sun.Eng.Sun.COM>
Date: 30 May 89 22:19:32 GMT
References: <514@philmtl.philips.ca> <2611@solo3.cs.vu.nl> <14109@watdragon.waterloo.edu>
Sender: news@sun.Eng.Sun.COM
Lines: 21

In article <14109@watdragon.waterloo.edu>, afscian@violet.waterloo.edu (Anthony Scian) writes:
> In article <2611@solo3.cs.vu.nl> msschaa@cs.vu.nl (Schaap MS) 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!
> You can thank Microsoft for this behaviour because they used Intel 
> reserved interrupts for their own purposes (MS-DOS). 
> 
[stuff deleted]
> Anthony
> //// Anthony Scian afscian@violet.uwaterloo.ca afscian@violet.waterloo.edu ////

IBM used the reserved interrupts, not Microsoft.  Keep your facts straight.

						Alan L. Pope
						alpope@sun.com