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
=====
Micro Solutions Consulting        Member of The HTML Writers Guild
http://www.ezy.net/~microsol     International Webmasters Association
410-543-8996                MS Site Builder Network - Level 2 member
=====
-----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".
>

         The PCBUILD web site always needs good submissions.  If
          you would like to contribute to the website, send any
               hardware tech tips or hardware reviews to:
                           [log in to unmask]