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From: hsu@eneevax.UUCP (David T. Hsu)
Newsgroups: net.micro.atari
Subject: Re: A400 Keyboard Wiring (followup)
Message-ID: <392@eneevax.UUCP>
Date: Fri, 18-Oct-85 22:19:24 EDT
Article-I.D.: eneevax.392
Posted: Fri Oct 18 22:19:24 1985
Date-Received: Mon, 21-Oct-85 06:05:08 EDT
References: <851017-140850-1769@Xerox> <391@eneevax.UUCP>
Reply-To: hsu@eneevax.UUCP (David T. Hsu)
Organization: U of Maryland, EE Dept., College Park, MD
Lines: 53
Keywords: Atari keyboards; read on bold adventurer
Summary: and now the pin correspondence

Well, I sat up and figured out the pin correspondences so you wouldn't have
to.  It seems Atari saved space (and wire) by moving those chips to the
keyboard, and so now, here is are the translations from the new wiring
to the old.  Old pin numbers refer to my previous posting.

         new pin #      old posting pin #
 IC #1      14              1
             1              2
             2              3
            15              4
             4              5
            13              6
            12              7
             5              8

ribbon pin  #1              9

IC #2        1             10
             2             11
            15             12
             4             13
             5             14
            14             15
            13             16
            12             17

ribbon pins 10             18   reset
            11             19   option
            12             20   select
            13             21   start
            14             22   (common to above)

I believe the matrix is correct, since I've tried at least two intersections
for each wire number.  Beset by a flakey meter, it took me nearly 20 minutes
to confirm my suspicion that old pin 9 was connected to ribbon pin 1.
BTW, ic#1 refers to the one on the left, between the m and comma keys, and
just in case somebody doesn't have the red stripe, ribbon numbers are numbered
from the spacebar side to the edge.

Get those 400's doing something. NOW!

-dave


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David Hsu						Across the net...
USnail: Communications & Signal Processing Laboratory	hsu @ eneevax.umd.edu
	Dept of Electr Engr, Univ Md			hsu @ mit-prep.arpa
	College Park, MD 20742				hsu @ umd2.arpa
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