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Path: utzoo!utcs!mnetor!seismo!lll-crg!topaz!ll-xn!mit-amt!mit-eddie!genrad!decvax!ima!johnl
From: johnl@ima.UUCP
Newsgroups: net.micro.pc
Subject: Re: Intel Above Board for AT/ DESQVIEW !
Message-ID: <162@ima.UUCP>
Date: Tue, 15-Jul-86 22:50:46 EDT
Article-I.D.: ima.162
Posted: Tue Jul 15 22:50:46 1986
Date-Received: Wed, 16-Jul-86 20:23:46 EDT
References: <338@gumby.UUCP>
Reply-To: johnl@ima.UUCP (John R. Levine)
Organization: Javelin Software Corporation
Lines: 34
Keywords: How do they fit in......
Summary: use it as a RAM disk

In article <338@gumby.UUCP> sock@gumby.UUCP (Isabella Ng) writes:
>How does DESQVIEQ interact with the EMS, does it allocate memory equally
>to all programs run under QuarterDecks DESKQVIEW, if I run 9 programs
>simultaneously does it divide the memory equally !

Each program that uses EMS asks for some expanded memory, usually when
it starts up.  There is no practical way to give expanded memory back
short of exiting a program, so most programs seem to have heuistics like
allocate 1/4 of the available expanded memory when it starts, and grab
the other quarters as needed.  Practically speaking, this means that the
first program you load will get the largest fraction of your expanded memory.
Programs that don't know about EMS won't ask for any and so won't get any
assigned.

>[ what about EMS vs. EEMS]

The RAMPage EEMS system lets Desqview map expanded pages in and out of the
regular 640K address space.*  Desqview makes good use of this, and I have run
multiple programs simultaneously, even though together they added up to well
over a megabyte.  If you don't have EEMS, it swaps programs in and out which
works OK except that swapped out programs don't get swapped back in until
you explicitly ask to restart them.  If you have an Above Board, that's EMS
rather than EEMS so the best you can do is to set up a RAM disk on the EMS
and tell DesqView to swap there.

* - It can only do the page swapping in addresses assigned to the RAMPage
card, so to get the best use of EEMS and DesqView, you should pull the
chips off the motherboard, except for the first row, and plug them into
your RamPage card to maximize the amount of remappable memory.
-- 
John R. Levine, Javelin Software Corp., Cambridge MA +1 617 494 1400
{ ihnp4 | decvax | cbosgd | harvard | yale }!ima!johnl, Levine@YALE.EDU
The opinions expressed herein are solely those of a 12-year-old hacker
who has broken into my account and not those of any person or organization.