Position of the DOS=HIGH Command in CONFIG.SYS (71705)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0

This article was previously published under Q71705


When loading Microsoft MS-DOS into high memory, DOS=HIGH and DEVICE statements for the XMS driver do not have to be the first two entries in the CONFIG.SYS file.

This information applies to MS-DOS version 5.0.


The DOS=HIGH statement can appear on any line in the CONFIG.SYS file. After finding the DOS=HIGH statement, MS-DOS loads each device driver starting at the beginning of the CONFIG.SYS file. When the XMS driver is loaded, MS-DOS relocates into high memory. Because the device drivers are loaded in the order they appear in the file, any device driver that needs XMS memory should appear after the XMS driver.

Only DEVICEHIGH statements in the CONFIG.SYS file that appear after the XMS driver and the UMB provider will be loaded into the upper memory area (UMA). When using MS-DOS 5.0 memory management, this means DEVICEHIGH statements must appear after the HIMEM.SYS and EMM386.EXE drivers.

Modification Type: Major Last Reviewed: 11/19/1999
Keywords: KB71705