Microsoft KB Archive/74209

= Why MEM /C Does Not Show UMB Information =

Article ID: 74209

Article Last Modified on 11/22/1999

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APPLIES TO


 * Microsoft MS-DOS 5.0 Standard Edition

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This article was previously published under Q74209



SUMMARY
If you type the command MEM /C and receive information only about the conventional portion of memory, one of two things is occurring:
 * The command is being given in a virtual machine, such as the MS-DOS prompt under Windows 3.0. -or-


 * There are no upper memory blocks (UMBs) available or in use.



MORE INFORMATION
In order for upper memory block information to be displayed, the following must be in your CONFIG.SYS file:  UMB must be specified on the DOS=HIGH or DOS=LOW line to tell MS-DOS to make UMBs available. For example:

dos=high,umb

 EMM386 must be loaded in the CONFIG.SYS file, which will map some of the available extended memory into the upper memory area (UMA) as usable UMBs. For UMB support, either the RAM or NOEMS switch must be used. For example:

device=c:\dos\emm386.exe noems

Note: EMM386.EXE requires that HIMEM.SYS be loaded.

For more information on the use of upper memory blocks, see pages 313-330 and 605-609 of the version 5.0 &quot;Microsoft MS-DOS User's Guide and Reference,&quot; or query on the following words:

requirements and UMB and support and MS-DOS 5.0

Additional query words: 5.00

Keywords: KB74209

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