Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!lll-lcc!rutgers!husc6!uwvax!uwmacc!anderson From: anderson@uwmacc.UUCP (Jess Anderson) Newsgroups: comp.sys.ibm.pc Subject: Re: Zenith 158 Ram Upgrade Message-ID: <883@uwmacc.UUCP> Date: Thu, 15-Jan-87 08:54:09 EST Article-I.D.: uwmacc.883 Posted: Thu Jan 15 08:54:09 1987 Date-Received: Fri, 16-Jan-87 00:42:41 EST References: <314@rocky2.UUCP> Organization: UWisconsin-Madison Academic Comp Center Lines: 34 Summary: 150 ns chips are fine. In article <314@rocky2.UUCP>, reintom@rocky2.UUCP (Tom Reingold) writes: > 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? > I believe you should get chips with a rating of > 120ns to ensure proper operation at 8 MHz. I have done this. I used 150ns chips (Toshiba, but any maker with a good rep and a favorable price should be OK). We have a PC maintenance guru where I work, and he said I would have no problems with 150 ns chips and need not invest in faster ones. I have been running the machine at 8 MHz since September with a full load of RAM. I have no problems of any kind (knock wood). There is a simple tool that compresses the pins slightly to make inserting the chips easier on your nerves. I didn't know about this tool at the time, but I had no problems with installation. If you end up wanting more RAM for RAMdisks, I've heard that not all add-ins work. For example, Tall Trees JRAM does not work. AST RAMpage does and Intel AboveBoard does. I have not yet tried either. On other upgrade matters, I have added an ST238 with Adaptec 2070a controller to get a 30 MB hard disk (works like a champ!). If you want an EGA, be aware that not all EGA boards work in a Z-158, but here I don't have any other reliable information. Doubtless someone else does. Good luck and have fun -- I sure am having fun with my machine! -- ==ARPA:==============anderson@unix.macc.wisc.edu===Jess Anderson====== | UUCP: {harvard,seismo,topaz, (avoid ihnp4!) 1210 W. Dayton | | akgua,allegra,usbvax}!uwvax!uwmacc!anderson Madison, WI 53706 | ==BITNET:======================anderson@wiscmacc===608/263-6988=======