Controlling Extended Memory with HIMEM.SYS
The HIMEM.SYS driver provides extended memory support at the command prompt. The eXtended
Memory Specification (XMS) is a method that applications use to overcome the DOS memory limitations.
You set the amount of available XMS using the PIF for the application. However, you can
further refine XMS functionality by relying on the command line switches described in this section.
As with all device drivers that you add to the Config.NT file, you begin the HIMEM.SYS entry using
the device= entry, followed by the drive and path to the HIMEM.SYS file. This driver uses the
following syntax:
DEVICE=[drive:][path]HIMEM.SYS [/HMAMIN=m] [/INT15=xxxx]
[/NUMHANDLES=n] [/TESTMEM:{ON|OFF}] [/VERBOSE]
The following list describes each of the command line arguments.
NOTE HIMEM.SYS includes a number of command line switches, many of which are archaic.
For example, even though HIMEM.SYS still supports the /A20CONTROL command line switch,
you??™d have to have a very old computer (over 10 years old) to need it. In short, unless you have a
very old system, you??™ll never have a use for these older command line switches.
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