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Path: utzoo!watmath!clyde!akgua!sdcsvax!sdcrdcf!hplabs!tektronix!tekig1!rickb
From: rickb@tekig1.UUCP (Rick Bensene)
Newsgroups: net.micro.trs-80
Subject: ? Model 100 RAM Expansion ?
Message-ID: <1637@tekig1.UUCP>
Date: Wed, 9-May-84 13:05:35 EDT
Article-I.D.: tekig1.1637
Posted: Wed May  9 13:05:35 1984
Date-Received: Sun, 20-May-84 00:06:37 EDT
Organization: Tektronix, Beaverton OR
Lines: 29

There was some discussion in this newsgroup fairly recently
concerning RAM expansion on the TRS-80 Model 100 portable
computer.  I have recently become the owner of one of these,
regretably, with the 8K RAM. I would like to expand the RAM
to 32K.  I have available some Hitachi HM6264P-12 8Kx8
CMOS Static Rams, which I have been told should be compatible
with the machine, as far as speed/power consumption goes.
However, RS used cute little hybrid packages which have 4 2kx8
leadless carriers mounted on them, and the pin spacing of
the hybrid is different than the spacing of the 28 pin RAMS
I have.  The pin count is 28 on the Hyrbid, which leads me
to believe that there is a chance the my scheme MIGHT work.
My questions are:

1. Will the above mentioned RAMs work?
2. Are the pinouts of the RAMS the same as the pinout of the
   hybrid.
   A) If not:  Can someone fill me in on what kind of jumpering
      will be required to make the RAM compatible?

Any help that anyone can offer concerning this will be greatly
appreciated.

   Thank you,

Rick Bensene
..tektronix!tekig1!rickb