Microsoft KB Archive/106432

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MEM Reports Incorrect Value for Used Extended (XMS) Memory

Article ID: 106432

Article Last Modified on 11/21/1999


  • Microsoft MS-DOS 6.0 Standard Edition
  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.21 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q106432


On systems with more than 16 megabytes (MB) of memory, if you are in Windows when you run the MEM command, it may report an incorrect number of bytes for the used extended memory (XMS) value. This problem may also occur when you are not in Windows if you are using a third-party XMS memory manager.


This problem occurs when you have more than 16 MB of memory and your ROM BIOS reports a maximum of 15 MB via interrupt 15h, function 88h.


Microsoft has confirmed this to be a problem in MS-DOS versions 6.0, 6.2, and 6.21. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: 6.22 6.20

Keywords: KB106432