🚀 go-pugleaf

Summary: Answer enclosed.
References: <1294@ncr-sd.UUCP>

In article <1294@ncr-sd.UUCP>, lodman@ncr-sd.UUCP (Mike Lodman) writes:
> Would someone please respond via e-mail and tell me what ram chips
> are needed to upgrade a 256K Zenith 158 PC to the full 640K?
> -- 
> Michael Lodman

To upgrade a Z-158 to 640K, you need to buy two more banks of
256K-bit chips to add to the one you have.  A bank consists of
nine chips.  I believe you should get chips with a rating of
120ns to ensure proper operation at 8 MHz.  

A Zenith engineer instructed me in this matter.  I learned the
following:  When you install the chips, you will have 768K
installed on the CPU board.  The computer will not recognize the
last 128K.  There is no harm in this.  

I don't know how you can put another 384K in the machine to use
as a RAM disk.  It may not be possible but I trust you don't
care.

We bought our 256K chips from I.C. Express.  I would recommend
them because they have served us well.  Their prices are good
too.  Their address is:

	15358 Valley Blvd
	City of Industry, CA 91746
	(800) 892-8889 (out of CA)
	(800) 882-8181 (in CA)

-- 
Tom Reingold;  The Rockefeller University; 1230 York Av; NY 10021
PHONE: (212) 570-7709 [office]; (212) 304-2504 [home]
ARPANET: reintom@rockefeller.arpa BITNET: REINTOM@ROCKVAX
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