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From: dpw@unisec.usi.com (Darryl P. Wagoner)
Newsgroups: comp.sys.att
Subject: Re: PC7300 upgrade question
Message-ID: <517@unisec.usi.com>
Date: Fri, 15-May-87 19:09:49 EDT
Article-I.D.: unisec.517
Posted: Fri May 15 19:09:49 1987
Date-Received: Sun, 17-May-87 01:32:06 EDT
References: <2069@arizona.edu>
Reply-To: dpw@unisec.USI.COM (Darryl P. Wagoner)
Organization: UniSecure Systems, Inc. Newport, RI
Lines: 50
Keywords: UNIXPC PC7300 memory disks upgrade

In article <2069@arizona.edu> trh@arizona.edu (Tom Hicks) writes:
>
>  It's tax refund time and I am thinking of upgrading my PC7300.
>I am wondering about doing the work myself and am polling the 
>net for sagacious advice.
>
>1) Has anyone out there done their own memory upgrade either on
>   the motherboard or the 500k RAM card?
>       It seems as if one could just cut out the old chips,
>   carefully remove the legs, etc, etc...
>   What I really worry about, though, is that some resistor or
>   capacitor value would have to be changed, or some point-to-point
>   wiring change would be necessary and I wouldn't know it.
>   Anyone know anything about this?

This is one of the things that you don't do at home unless you are
a pro at multi-layered PC boards.  They are too easy to screw up.
And if you do screw it up you will be out $2400+ bucks to replace it.
It's not worth to save a few hundred bucks.

>2) What half-height 40M hard disks are spacially and electrically plug
>   compatible?
>      I would like to just "drop" a new disk in place. How about
>    the new Seagate 251 drives? Anyone have experience with these?
>

I just installed a Seagate 251 in my Unix PC and I am very happy with it.
The metal case around the disk drive will not fit.  No big deal just
leave it off.  Also the screws that secure the drive that came off
the Miniscript are to big for the ST 251.  Find some more screws before
you take your system apart.

You can still hear the Seagate, but it sure is quieter than it was.

>3) If I just increase the memory, will I find more disk space used
>   as swap space, or is the usage unrelated to real memory?
 
No, swap is where the system saves the process info when it doesn't
have room in memory.  Therefore if you have more RAM memory then
you will be using less swap space under the same conditions.  I currently
have 4 meg of swap space.  I have yet to get any out of memory message
from the system.  This includes unpacking and uncompressing a full news feed
with 3 users running different programs.  At which point the five minute
load aveage was over 2.00.

-- 
Darryl Wagoner			
UniSecure Systems, Inc.; 		dpw@unisec.usi.com
Newport,  RI; (401)-849-0857 
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