Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!husc6!bloom-beacon!oberon!cit-vax!ucla-cs!zen!ucbvax!pro-novapple.UUCP!dales From: dales@pro-novapple.UUCP.UUCP Newsgroups: comp.sys.apple Subject: Memory Chips for GS-RAM ... Message-ID: <8711160756.AA05106@crash.CTS.COM> Date: Sun, 15-Nov-87 10:13:51 EST Article-I.D.: crash.8711160756.AA05106 Posted: Sun Nov 15 10:13:51 1987 Date-Received: Thu, 19-Nov-87 06:34:20 EST Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: pnet01!pro-sol!pro-charlotte!pro-connection!pro-novapple!dales@nosc.MIL Organization: The ARPA Internet Lines: 46 To: netnews Jock Cooper >This is exactly what I did with my old Ramworks //... I bought it with 256k >and bought 768k from MicroProcessors, Inc. I thought I could just move >those chips from the ramworks // to the gsRam. It only worked partially... >The Hitachi chips that came on the Ramworks // worked on the gsRam, but the >768k of Toshiba chips I had previously purchased from Micro... inc. were >reported by the ae memory test as being bad (every one). > >So instead of having 1.5 megs in my machine i have to settle for 768k until >I can figure out why those Toshiba chips dont work on the gsRam, or buy >more... ----------- This has become almost a classic GS memory expansion problem. GS-RAM (and Apple's GS Memory Expansion Card too) require RAM chips that work with the "CAS before RAS" (Column Access Strobe before Row Access Strobe) mode of memory refresh. I suspect that your Toshiba chips happen to be RAS before CAS mode chips which is why they fail the chip test - even though, in the right useage, they may be perfectly good. Check your GS-RAM manual; it has a list of acceptable chip numbers from various manufacturers: GS-RAM Hitachi HM50256-15 Mitsubishi M5M4256P-15 Fujitsu MB81256-15 OKI MSM41256A-15AS/RS Micron Technologies MT1259-15 Samsung KM41257-15 Toshiba TMM41257-15 Texas Instruments TMS4256-15 This is the list for the 256K chips and, as AE notes, it is only a partial list. Hope this is useful... I just saw the net feed on pro-novapple. Later... .dale. ----------- Proline: (crash!pnet01!pro-sol!pro-carolina!pro-connection!pro-novapple!dales