Microsoft KB Archive/103313

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Article ID: 103313

Article Last Modified on 11/19/1999


  • 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 Q103313


Some laptop computers may experience problems associated with using Microsoft's MS-DOS EMM386.EXE expanded memory manager.


EMM386.EXE allows MS-DOS to simulate expanded memory on computers with a 386 or higher microprocessor. It also allows terminate-and-stay- resident (TSR) programs and device drivers to be loaded into the upper memory area (UMA) to free conventional memory for MS-DOS-based applications. You may experience problems using EMM386.EXE on certain laptop computers.



Toshiba has confirmed that EMM386.EXE, included with the Microsoft MS-DOS 6 and 6.2 Retail Upgrade Package, is not compatible with the Resume mode on Toshiba laptops.

EMM386.EXE also disables the PopUp window on Toshiba laptops. If the EMM386.EXE driver is loaded in the CONFIG.SYS file, the FN-PopUp key combination does not cause the PopUp window to be displayed; therefore, you may be unable to view the current battery charge or toggle the various battery options. Resolution

For further information concerning installing MS-DOS 6.0 on Toshiba computers, call Toshiba Technical Support at (800) 456-8649.



After running MEMMAKER.EXE or manually adding EMM386.EXE to the CONFIG.SYS file on a CompuAdd 325TFX or 425TFX running LAP.SYS, the computer may stop responding (hang) on startup.


This problem occurs because the LAP.SYS driver, which loads in the CONFIG.SYS file, uses the upper memory address range C000-CFFF.


To correct this problem, you must exclude the C000-CFFF range by adding the parameter X=C000-CFFF to the EMM386.EXE line in the CONFIG.SYS file. For example:

device=c:\dos\emm386.exe x=c000-cfff

LAP.SYS is CompuAdd's power management system program. For more information, call CompuAdd Technical Support at (800) 999-9901.

Additional query words: 6.22 6.00 6.0 6 6.20 limulator hang hangs lockup compu add compu-add msdos ms dos power

Keywords: KB103313