PRB: A2108 Error When Using Simplified Segment Directives

 Last reviewed: March 18, 1996
Article ID: Q148509
The information in this article applies to:
  • Microsoft Macro Assembler for MS-DOS, versions 6.0, 6.1, 6.11

SYMPTOMS

When assembling code that uses simplified segment directives, the Macro Assembler displays an error message similar to this one: 

   error A2108: use of register assumed to ERROR

CAUSE

This error can occur because of incorrect order of the .DATA and .CODE directives in the assembly source code. The .DATA directive implies ASSUME CS:ERROR. Any code that appears after the .DATA directive and attempts to implicitly or explicitly use the CS register (such as JMP instructions or labels) will generate this error.

RESOLUTION

Make sure that a .CODE directive and not a .DATA directive precedes your procedure definitions and any other instructions.

STATUS

This behavior is by design.

MORE INFORMATION

Sample Code to Reproduce Error

; Assemble options needed: none

.MODEL small, c

.CODE

.DATA

my_label:

END

Additional reference words: 6.00 6.10
KBCategory: kbprg kbtshoot
KBSubcategory: MLIss

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: March 18, 1996
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.