Try this command in your config.sys for DOS 7 (win95)
device=himem.sys /A20Control:ON
See the web page
http://log.on.ca/users/rhwatson/dos7/v-himem-sys.html
for tips on getting himem to work for specific PC's.

Tom Turak

Rick,

I don't have a 486 manual in front of me, so I can't give you exact
details.  There is a setting in CMOS which controls the A20 line.  Find
that setting and compare it with one of the boards that is working
correctly.

Jim Meagher

-----Original Message-----
From: Rick van Heyst <[log in to unmask]>


>Greetings,
>The problem is as follows:  When we boot up DOS 6.22 and the Himem.sys
>driver is loaded in Config.sys we get the message: "ERROR: Unable to
>control A20 line   XMS driver not loaded".
>

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