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Q32691: FIX: Error Message A4100: Impure Memory Reference

Article: Q32691
Product(s): Microsoft Macro Assembler
Version(s): 5.1
Operating System(s): 
Keyword(s): 
Last Modified: 04-MAY-2001

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The information in this article applies to:

- Microsoft Macro Assembler (MASM), version 5.1 
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SYMPTOMS
========

MASM incorrectly generates the error message "A4100: Impure memory reference" on
the following source code:

     .286
     CODE segment
          ASSUME cs:code
          var1   db    ?
          DIV    var1
     CODE ends

CAUSE
=====

The DIV instruction incorrectly generates the error message. This error occurs
when the ".386" directive is used instead of the ".286" directive and the "dw"
directive is used instead of the "db" directive. Also, if the ".386" directive
is used with the "dd" directive, the DIV instruction will generate the error
message again.

RESOLUTION
==========

Microsoft has confirmed this to be a problem in Version 5.10. This problem was
corrected in MASM version 5.10a.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft product listed at the
beginning of this article. This problem was corrected in version 5.10a.

Additional query words: 5.10 buglist5.10 fixlist5.10a

======================================================================
Keywords          :  
Technology        : kbMASMsearch kbAudDeveloper kbMASM510
Version           : :5.1
Solution Type     : kbfix

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