Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!killer!tness7!tness1!nuchat!sugar!karl
From: karl@sugar.UUCP (Karl Lehenbauer)
Newsgroups: comp.unix.microport
Subject: Re: $#%&%%$ 286 Dos Merge
Summary: 1 meg motherboard = 640K base + 384K extended
Keywords: Any clues
Message-ID: <2208@sugar.UUCP>
Date: 28 Jun 88 11:31:01 GMT
References: <1893@qetzal.UUCP> <250@obie.UUCP>
Organization: Sugar Land UNIX - Houston, TX
Lines: 13

In article <1893@qetzal.UUCP>, rcw@qetzal.UUCP (Robert C. White) writes:
> The only thing I noticed that was wierd about this machine is that
> I had to put exactly 640k of 120-ns ram chips on the motherboard.
> There are 512k of 256k drams and 128k of 64k drams.  All chips are
> rated at 120ns.  When I tried to put 1 megabyte on the motherboard,
> all kinds of memory errors would result.

Remember that memory from 640K to 1 MB on the XT/AT is reserved for I/O.
If your motherboard accomodates 1 MB, it does so as 0-640K and 1MB-1.384MB,
so if you have extended memory (whatever they call it - it's the stuff that's
directly addressed, not paged a la Lotus/Intel), set it to begin at 1 MB plus
384K.
-- 
-- uunet!sugar!karl