Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!cmcl2!rna!rocky2!reintom From: reintom@rocky2.UUCP (Tom Reingold) Newsgroups: comp.sys.ibm.pc Subject: Re: Zenith 158 Ram Upgrade Message-ID: <314@rocky2.UUCP> Date: Wed, 14-Jan-87 11:49:47 EST Article-I.D.: rocky2.314 Posted: Wed Jan 14 11:49:47 1987 Date-Received: Thu, 15-Jan-87 18:43:02 EST Organization: Rockefeller Univ.,N.Y.C 10021 Lines: 37 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 UUCP: {seismo|ihnp4|yale|harvard|philabs|phri}!cmcl2!rna!rocky2!reintom