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------- Forwarded Message Follows ------- From: Self </leejim> To: "Joseph C. Wilson" <josephw@inc.net> Subject: Re: DIMM-RAM for the 755CX? Date: Mon, 27 Nov 1995 13:49:40 > Date: Mon, 27 Nov 95 10:28:09 CST > To: tp750@cs.utk.edu > From: "Joseph C. Wilson" <josephw@inc.net> > Subject: Re: DIMM-RAM for the 755CX? > At 03:37 PM 11/27/95 +0100, you wrote: > >I need a 16MB RAM-upgrade (DIMM) for the TP755CX. IMB's RAM is quite expensive > >so I'd prefer to go for the cheaper version. Do you have good or bad > >experiences with particular brands? Anything I should be aware of? > > > > > Be sure you get the DIMM Adapter (IBM PC Direct Part# 84G2151, $105.00 (US) > as of about 11/1/95). To the best of my knowledge, there are no "ThinkPad > Proven" DIMM vendors at this time. We are ordering some memory upgrades for > our 755cx's and elected to go w/ IBM despite the price premium. Our feeling > was the premium is worth the lack of any possible incompatibilities/problems > on such a sensitive part of our systems. > > You might also want to look at the IC-DRAM memory modules as they can be > more easily found and do not require an adapter. Downside is that should > you want to upgrade at a later time you have to replace the entire module. > > Good luck > > Joe Wilson > josephw@beta.inc.net > Milwaukee, WI > > Sorry, the DIMM memory modules do not work in the 755CX. I ordered and received one from IBM PC-Direct (16MB). Although it fits physically, the DIMM modules are non-parity and the 755CX needs parity memory (or vice-versa, can't remember). When I discovered this, I called IBM and spoke with one of the design engineers who said this was indeed true, so I returned the DIMM for a 16MB DRAM card instead. IBM has (supposedly) since updated the sales/order system to let the sales people know that 755CX<->DIMM are incompatible. ---------- Jim Lee Diamond Quest Consulting leejim@peak.org 30563 Ridge St http://www.peak.org/~leejim Lebanon, OR 97355