Microsoft KB Archive/74977

= EMM386 and Early Versions of HIMEM.SYS =

Article ID: 74977

Article Last Modified on 11/21/1999

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APPLIES TO


 * Microsoft MS-DOS 5.0 Standard Edition

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This article was previously published under Q74977



SUMMARY
EMM386.EXE and some versions of EMM386.SYS will detect which version of HIMEM.SYS is loaded. If an early version of HIMEM.SYS is detected (for example, version 2.04), EMM386 will issue the following message:

Microsoft Expanded Memory Manager 386 Version 4.20.06X

(C) Copyright Microsoft Corporation 1986, 1990

Warning : This version of HIMEM.SYS may cause conflicts with EMM386.

Press any key when ready...

EMM386 may load successfully despite the incorrect version of HIMEM.SYS. If EMM386 loads, it will allocate all XMS memory available from HIMEM.SYS, which may cause problems for other programs that use XMS memory.

Microsoft recommends that any combination of driver versions that yield the above message not be used. The latest versions of each driver should be used, and these versions should not be mixed. A table of driver versions for MS-DOS versions 4.0 and later and Windows versions 3.0 and later is included below.



MORE INFORMATION
Product and Version Driver        MS-DOS 4.01   Windows 3.0   Windows 3.0a   MS-DOS 5.0 --        ---   ---      --

HIMEM.SYS       2.04          2.60          2.60           2.77 SMARTDRV.SYS    2.10          3.03          3.03           3.13 RAMDRIVE.SYS    2.12          3.04          3.06           3.06 EMM386          4.00        4.10.0419     4.10.0419      *4.20.06x

extension to allow some command line processing. Previous versions of EMM386 had an .SYS extension, which act solely as device drivers.
 * EMM386 version 4.20.06x, shipped with MS-DOS 5.0, has an .EXE

Additional query words: 3.00 3.00a 5.00 noupd

Keywords: KB74977

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