Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpl-opus!hpcc05!hpsciz!bich
From: bich@hpsciz.sc.hp.com (Bich Tran)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: 386 memory problems - help needed
Message-ID: <13340004@hpsciz.sc.hp.com>
Date: 4 Jun 91 17:51:00 GMT
References: <22764@shlump.lkg.dec.com>
Organization: Hewlett-Packard, Santa Clara, CA
Lines: 15

As a designer of instruments cards for PC, PC hardware is nothing new to me.
However upgrading from one system to another can be a very frustating
experience ven for an experienced engineer. If you upgrading systems from the
same manufacturer, chances of incompatibility is nil: when I uograded my
Vectra ES/12 (286-12) to a QS/20 (386-20), it took me half an hour and no
problem encountered. But when I upgraded my ES/12 to a 486 clone, it took
me 3 full days to get it worked. I still have incompatibility problem to
deal with like my COM ports are intermittently bad.
Sorry for rambling around, the missing 384K is used for shadowing RAM: video
ROM and system BIOS are loaded in this higher speed RAM for improved performance
AMI bios just don't report it. If you disable( and you should not) shadowing 
thru setup you can regain this RAM portion for Exented.

regards,
bich