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From: psfales@cbnewsc.ATT.COM (Peter Fales)
Newsgroups: comp.sys.att,unix-pc.general
Subject: Re: Memory Expansion
Keywords: 7300, DOS-73, Memory
Message-ID: <4163@cbnewsc.ATT.COM>
Date: 27 Oct 89 22:03:47 GMT
References: <7298@sdcsvax.UCSD.Edu>
Distribution: usa
Organization: AT&T Bell Laboratories
Lines: 34

In article <7298@sdcsvax.UCSD.Edu>, jarrett@gremlin.ucsd.edu (Brooke Jarrett) writes:
> I'm posting for a friend of mine (with an ulterior motive).
> My friend has a 7300 with .5Meg on the mother-board and 2 expansion
> boards with .5Meg each.  He would like to upgrade the 64k chips
> to 256's (which will leave him with an extra board for me 8-).
> Does anyone have info as to a memory expansion kit, or know where
> to get the 256 chips.

This is a fairly easy change to make.  (Assuming you call replacing 72
soldered chips easy :-).   There are at least two style of motherboards,
however the one you probably have has three pins near the front of
the motherboard labeled E1-E2-E3.  There is a jumper between two of
them.  Replace the chips, move the jumper, and you should have a 2MB
system.

> 	Also, he just got his DOS73 board (I'll get mine the end of the
> month), and is planning to replace the 8086 with a NEC V30.  This is
> supposed to give a 30% increase in speed, and the NEC V30 only costs,
> $15.00.  Does anyone know of any problems with this switch.

I have never heard of anyone putting a V30 in a DOS-73 (this sounds
kind of like putting racing tires on a Volkswagen!), but I have heard
of a number of people putting them in PC's and generally have had no
problems.  The 30% improvement is a little optimistic though - only
an impossibly contrived instruction mix could come close to this, but
the price is right, even for a much smaller gain.  Remember, that the
V30 will not help much with either disk or screen I/O, both of which
have to go through the same UNIX operating system.

-- 
Peter Fales			AT&T, Room 5B-420
				2000 N. Naperville Rd.
UUCP:	...att!peter.fales	Naperville, IL 60566
Domain: peter.fales@att.com	work:	(312) 979-8031