Path: utzoo!censor!geac!maccs!cs4g6ag
From: cs4g6ag@maccs.dcss.mcmaster.ca (Stephen M. Dunn)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Need Info on Memory and Math Chip Speeds for 286
Message-ID: <2581A8CC.29511@maccs.dcss.mcmaster.ca>
Date: 10 Dec 89 00:52:27 GMT
References: <176@venice.SEDD.TRW.COM>
Reply-To: cs4g6ag@maccs.dcss.mcmaster.ca (Stephen M. Dunn)
Distribution: usa
Organization: McMaster University, Hamilton, Ontario
Lines: 27

In article <176@venice.SEDD.TRW.COM> ries@venice.sedd.trw.com (Marc Ries) writes:
$   I have a Packard Bell 6/12MH 286 Clone (the Legend V/Force 286 Model)
$   with 1MB memory, DOS 3.3.
$   Q1:  I would like to upgrade the 4 motherboard 256K SIMMS with
$        1MB SIMMS but don't know how fast I need the memory to
$        be (100NS? 80NS?).  The current chips didn't have any speed
$        info on them.

   My 12 MHz machine requires 80 ns RAM for zero wait states, and I imagine
any normal sort of speed (100, 120, 150) would work at one wait state (I'm
using 100 ns parts because that's what was on the board and I can't afford
to trash them and put in 80 ns parts).

$   Q2:  The User's Manual mentions that the 80287 math co-processor
$        should be either 6 or 12 MH.  The fastest availiable at the
$        most economic cost is only running 10MH.  The only one I see
$        advertised at 12MH is the 80C287-A.  Can I use either or neither?

   Usually (always?) the 287 is run at 2/3 the clock speed of the 286, so
you shouldn't need the 12 MHz part ... but I'm not speaking from experience,
as I can't afford (or justify) a 287.

-- 
Stephen M. Dunn                               cs4g6ag@maccs.dcss.mcmaster.ca
          <std_disclaimer.h> = "\nI'm only an undergraduate!!!\n";
****************************************************************************
    If it's true that love is only a game//Well, then I can play pretend