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# HIMEM.SYS Fails to See More than 64 MB on EISA Machine

Article ID: 103557

Article Last Modified on 12/5/2003

APPLIES TO

- Microsoft MS-DOS 4.01 Standard Edition
- Microsoft MS-DOS 5.0 Standard Edition
- Microsoft MS-DOS 5.0a
- Microsoft MS-DOS 6.0 Standard Edition
- Microsoft MS-DOS 6.2 Standard Edition
- Microsoft MS-DOS 6.21 Standard Edition
- Microsoft Windows 3.1 Standard Edition
- Microsoft Windows 3.11 Standard Edition
- Microsoft Windows for Workgroups 3.1

This article was previously published under Q103557

## SYMPTOMS

Versions of HIMEM.SYS earlier than 3.10 may not recognize more than 64 megabytes (MB) of memory on EISA bus computers.

## CAUSE

This is because HIMEM.SYS does not recognize EISA memory blocks that start between 64 MB and 65 MB. On these machines, HIMEM.SYS only sees 64 MB of memory.
NOTE: MS-DOS 6.2 and Windows for Workgroups version 3.11 provide HIMEM.SYS version 3.10.

Additional query words: 6.0 5.0 5.00 5.00a 3.1

Keywords: KB103557