Path: utzoo!attcan!uunet!lll-winken!ames!xanth!ukma!rutgers!bellcore!faline!thumper!ulysses!att!whuts!homxb!antique!ees
From: ees@antique.UUCP (Gene Sampieri)
Newsgroups: comp.sys.apple
Subject: Apple II GS Memory Problems
Message-ID: <2500@antique.UUCP>
Date: 11 Jan 89 12:46:58 GMT
Organization: AT&T Bell Labs, Holmdel, NJ
Lines: 19


I am trying to upgrade a Apple II GS memory expansion card from the normal
256k to a full 1 meg (for a machine total of 1.25).  The chips on the board
are TI TMS4256, and the ones I am using are NEC 41256 or Toshiba 41256. 
According to the data books these are identical. All are 150ns devices.
The system will not boot up when they are installed and the jumpers in
place. The control panel willl come up properly and does indicate that there
is 1.25 meg total memory. I suspect only the jumpers are being read in this 
case and the memory is not being tested.

Am I doing anything wrong??  Is there something the books that come with the
machine (system and memory books) are not telling me??

HELP

Gene Sampieri
AT&T Bell Labs
Holmdel N.J.
vax135!ees