(Fwd) Re: DIMM-RAM for the 755CX?

["Jim Lee" <leejim@PEAK.ORG>]

------- 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