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From: mo@well.UUCP (Maurice Weitman)
Newsgroups: net.micro.pc
Subject: Re: SCO Xenix and Add on Memory
Message-ID: <1387@well.UUCP>
Date: Thu, 3-Jul-86 10:28:58 EDT
Article-I.D.: well.1387
Posted: Thu Jul  3 10:28:58 1986
Date-Received: Fri, 4-Jul-86 06:55:46 EDT
References: <138@wolf.UUCP> <347@spdcc.UUCP>
Reply-To: mo@well.UUCP (Maurice Weitman)
Organization: Whole Earth Lectronic Link, Sausalito CA
Lines: 31

In article <347@spdcc.UUCP> dyer@spdcc.UUCP (Steve Dyer) writes:
>XENIX-286 (and any other UNIX which runs in protected mode on the PC/AT)
>requires memory boards which fill the 16meg address space of the 286, such
>as the AST ATvantage and the AST RAMvantage.  There are "generic" versions
>of such boards, too, if the AST boards are too expensive for you.
>
>The LIM and EEMS boards like the RAMpage and the Intel Above Board use
>a kind of bank-switching, allowing DOS to map multiple pages of memory into
>parts of the 640K address space of the 8086 and the 286 in real mode,
>which is of no use for any version of UNIX on a 286.
>-- 
>Steve Dyer
>dyer@harvard.HARVARD.EDU
>{linus,wanginst,bbncca,bbnccv,harvard,ima,ihnp4}!spdcc!dyer

Steve, the AST RAMpage AT board can be configured to use its memory (up to
2mb/board, 8mb/system) as conventional (DOS <640k), expanded (bank-switched
or "paged") and/or extended (non-paged, protected mode) in any combination.

I believe, though I'm not sure, that the Intel Above-board AT can do the
same.

Disclaimer... blah connection with AST blah Intel blah blah blah, etc.


-- 

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