Requirements for UMB Support in MS-DOS 5.0 (71865)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
This article was previously published under Q71865
SUMMARY
MS-DOS version 5.0 provides systems the ability to free up
conventional memory by running device drivers and other memory
resident programs in the upper memory blocks (UMBs) located in the
upper memory area (UMA). The UMA is address space located between 640K
and 1024K that normally contains the system ROM BIOS and the video,
network, and other hardware adapters. To access MS-DOS 5.0's ability
to support UMBs, Microsoft recommends the following system conditions
be met:
• A 80386 or 80486 microprocessor
• 350K of XMS memory
• The following CONFIG.SYS statements:
device=himem.sys
dos=umb or dos=high,umb
device=emm386.exe noems or device=emm386.exe ram
Any DEVICEHIGH statements in the CONFIG.SYS file must follow the two
device statements previously mentioned.
Modification Type: |
Major |
Last Reviewed: |
11/26/1999 |
Keywords: |
KB71865 |
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