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This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.

03.016 How do I modify my ZipGS to accept the new "skinny" RAM chips?

         With a little modification you can make a Zip with wide sockets accept
both the wide (600 mil) and the newer 300 mil skinny 32k x 8 Static RAMs
(SRAMs). Ground yourself then carefully pry out the static rams.  Look at the
socket and you will notice two or three horizontal bars holding both sides of
the socket together (Picture D).  Carefully snip those out (wire cutters work
well for snipping plastic). This will expose a column of holes. Now, solder in
half of a socket.

     Refer to Picture E below. Plug your skinny SRAMs into the left and center
columns making sure the notch on the static ram is facing up-- i.e. toward top
edge of board. (Applying power with a chip incorrectly socketed could damage
the chip.)

                              _______ Added center strip
          Snip out           |
            ___           ___________ Skinny RAMs plug in here
           |   |         |   |        notched end facing up.
         ____ ____       _   _   _
        |o V o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|o|o|     |o| |o| |o|
        |o _____ o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|  o  |o|     |o| |o| |o|
        |o|o|o|     |o| |o| |o|
        |o _____ o|     |o| |o| |o|

            (D)             (E)

-----------------------------
    

 

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• prev: 03.015 How do I experiment with different oscillator frequencies?
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• next: 03.017 Is it really necessary to increase board voltage to do a TWGS/ZipGS speedup?

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