Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!udel!burdvax!dave
From: dave@PRC.Unisys.COM (David Lee Matuszek)
Newsgroups: comp.sys.mac.hardware
Subject: Re: IIsi SIMM upgrade path?
Message-ID: <15954@burdvax.PRC.Unisys.COM>
Date: 19 Dec 90 15:51:45 GMT
References: <542@ucunix.SAN.UC.EDU>
Sender: news@PRC.Unisys.COM
Organization: Unisys Corporation, Paoli Research Center; Paoli, PA
Lines: 55

>I have just ordered a IIsi 2/40.  What are my memory upgrade chunks?

The upgrades are to 5 and 17 Meg; I do not believe you can mix SIMM
sizes, so there are no intermediates.

>Apple also sells this as a 5/40 bundle; I assume they take 1M of memory
>out (256K SIMMs?) and replace it with 4M (1M SIMMs?).

Yes.  However, I have only heard of a 5/80 bundle from Apple; the 5/40
must be something your dealer is doing.

>  If, as I am led
>to believe, this machine will accept 4M SIMMS, what are the possible
>upgrade chunk sizes available for this machine?  Are there 2 banks of
>4-SIMM sockets each, as in the other modular Macs?

As in the Mac+, there is one bank, holding 4 SIMMs.  Replacing SIMMs
is very similar to the Mac+, but the SIMM holders are better built.

>  What's the story on
>mixing 4M SIMMs in one bank and 256K SIMMs or 1M SIMMs in another (I
>know already about not mixing SIMMs in the same bank, nor different
>speeds in the same bank; see other thread (-: )?

I wouldn't try mixing sizes; mixing speeds is OK so long as they are
all fast enough for the machine.

>
>Thanks for any comments...

I bought a IIsi 2/40 about a week and a half ago, and almost
immediately discovered I had seriously miscalculated my memory
requirements.  I used a Mac+ with 1 Meg for a long time, with few
problems; I thought 2 Meg would be enough, for a while, on the IIsi.
Wrong.

Color pictures really eat memory fast.  The larger (13" hi-res) screen
eats memory.  The larger screen makes MultiFinder much more useable
than on the Plus, and MultiFinder eats memory.  And let's not even
talk about what a color backdrop does....

I bought 4 1-Meg SIMMs and installed them last night.

BTW, I bought the SIMMs from Peripheral Products, $39 each, plus $8
S&H, plus 2% surcharge for Visa; total, $168.92.  You can do a little
better buying from the Chip Merchant, but then you have to hassle with
C. O. D. 

>Ted Morris		giving up on cutesy .sigs for a while...


-- Dave Matuszek (dave@prc.unisys.com)
-- Unisys Corp. / Paoli Research Center / PO Box 517 / Paoli PA  19301
-- Any resemblance between my opinions and those of my employer is improbable.
< You can put a mouse on an IBM.  And you can put a radio on a motorcycle. >