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Microsoft KB Archive/103521

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Knowledge Base

DEVICEHIGH Uses UMB from Previous DEVICEHIGH Command

Article ID: 103521

Article Last Modified on 11/18/1999


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

This article was previously published under Q103521


This information applies to both Microsoft DoubleSpace and Microsoft DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands and filenames.


If you have a DEVICEHIGH statement without an explicit /L parameter, MS-DOS uses the same upper memory block (UMB) as the last DEVICEHIGH command that did have an explicit /L parameter. For example, if you have the following commands in your CONFIG.SYS file, RAMDRIVE.SYS loads into region two:


If you remove the DEVICEHIGH command for DBLSPACE.SYS, RAMDRIVE.SYS loads into region one.

NOTE: This example assumes both UMBs are large enough to hold RAMDRIVE.SYS.

Additional query words: 6.20

Keywords: KB103521