Microsoft KB Archive/84587

= Microsoft Knowledge Base =

PD0547: Replacement Memory Managers for MS-DOS 5.0
Last reviewed: May 1, 1997

Article ID: Q84587

5.00 5.00a MS-DOS kbfile kbappnote

The information in this article applies to:


 * Microsoft MS-DOS operating system versions 5.x

The Application Note titled &quot;Replacement Memory Managers for MS-DOS 5.0&quot; (PD0547) includes updated memory managers for Microsoft MS-DOS version 5.0. The drivers, HIMEM.SYS version 3.07 and EMM386.EXE version 4.44, are the same drivers that ship with Microsoft Windows version 3.1. The drivers conform to the eXtended Memory Specification (XMS) version 3.0, and allow use of up to 4 gigabytes of extended memory.

To obtain this Application Note, call Microsoft Product Support Services at (425) 637-7098. For complete information, see the &quot;To Obtain This Application Note&quot; section at the end of this article.

THE TEXT PD0547
Microsoft Product Support Services Application Note (Text File) PD0547: REPLACEMENT MEMORY MANAGERS FOR MS-DOS 5.0 Revision Date: 5/92 Disk Included The following information applies to Microsoft MS-DOS version 5.0.


 * INFORMATION PROVIDED IN THIS DOCUMENT AND ANY SOFTWARE THAT MAY   |
 * ACCOMPANY THIS DOCUMENT (collectively referred to as an           |
 * Application Note) IS PROVIDED &quot;AS IS&quot; WITHOUT WARRANTY OF ANY     |
 * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO   |
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A    |
 * PARTICULAR PURPOSE. The user assumes the entire risk as to the    |
 * accuracy and the use of this Application Note. This Application   |
 * Note may be copied and distributed subject to the following       |
 * conditions: 1) All text must be copied without modification and   |
 * all pages must be included; 2) If software is included, all files |
 * on the disk(s) must be copied without modification [the MS-DOS(R) |
 * utility DISKCOPY is appropriate for this purpose]; 3) All         |
 * components of this Application Note must be distributed together; |
 * and 4) This Application Note may not be distributed for profit.   |
 * Copyright 1992 Microsoft Corporation. All Rights Reserved.        |
 * Microsoft and MS-DOS are registered trademarks and Windows        |
 * is a trademark of Corporation Microsoft.                          |
 * is a trademark of Corporation Microsoft.                          |

Introduction
The disk provided with this Application Note contains HIMEM.SYS and EMM386.EXE, replacements for the HIMEM.SYS and EMM386.EXE files that are included with Microsoft MS-DOS version 5.0.

HIMEM.SYS is the MS-DOS extended memory manager. EMM386.EXE can be used to create upper memory blocks (UMBs) or to make extended memory emulate expanded memory. MS-DOS version 5.0 contains versions of these files that support using up to 15.384 megabytes (MB) of extended memory according to the Extended Memory Specification version 2.0 (XMS 2.0).

The replacement files are updated versions of the memory managers included with MS-DOS version 5.0 that support using up to 4 gigabytes (GB) of memory according to XMS version 3.0.

NOTE: If you use these replacement memory managers on an EISA system that has more than 16 MB of memory, problems can occur if you use Microsoft Windows operating system version 3.0. If you encounter problems running Windows 3.0 on such a system, you should return to using the original MS-DOS version 5.0 memory managers or upgrade to  Windows version 3.1.

Replacing Your Memory Managers
To update your memory manager files, do the following:

 Insert the enclosed PD0547 disk in floppy disk drive A.  At the command prompt, type the following and press ENTER copy a:\*.* where is the drive and directory where your MS-DOS files are located. For example, if your MS-DOS files are located in the \DOS directory on drive C, you would type the following command: copy a:\*.* c:\dos NOTE: If you are copying the memory managers from a drive other than A, substitute the appropriate drive letter for &quot;a&quot; in the above command. 

A message will be displayed stating:

2 file(s) copied. This indicates that your memory manager files have been successfully replaced.

TO OBTAIN THIS APPLICATION NOTE

 * You can have this Application Note mailed to you by calling Microsoft Product Support Services Monday through Friday, 6:00 A.M. to 6:00 P.M. Pacific time at (425) 646-5104. If you are outside the United States, contact the Microsoft subsidiary for your area.