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From: hsu@eneevax.UUCP (David T. Hsu)
Newsgroups: net.micro.atari
Subject: Re: A400 Keyboard Wiring (diagram)
Message-ID: <391@eneevax.UUCP>
Date: Fri, 18-Oct-85 17:35:52 EDT
Article-I.D.: eneevax.391
Posted: Fri Oct 18 17:35:52 1985
Date-Received: Mon, 21-Oct-85 05:05:52 EDT
References: <851017-140850-1769@Xerox>
Reply-To: hsu@eneevax.UUCP (David T. Hsu)
Organization: U of Maryland, EE Dept., College Park, MD
Lines: 51
Keywords: Radio Schlock; Atari Keyboards; silly earthlings
Summary: Wirin' them keys up

In article <851017-140850-1769@Xerox> Denber.wbst@XEROX.ARPA writes:
>...
>Adapting it for the 400 requires removing the 2 ICs on the board and
>soldering jumpers from the (now) empty holes to the keyboard socket
>in the 400.  One can figure out how to do this by reverse engineering
>...
>I went out and bought one of these keyboards (they look quite nice, and
>only $4.95!), but I don't have a TR Manual.  Does anyone have the
>information I need to make the connections?  Thanks.
>
>			- Michel

I too bought one, and promptly set about in search of my Dec '82 Creative
Computing, from which the following matrix is derived.  Note that this
is the original 400 keyboard circuits; I haven't finished tracing the
1200 keyboard yet to figure which pins go where.

wire #          1   2   3   4   5   6   7   8
------+----------------------------------------
    9 |        brk             ctl         both shiftkeys in parallel
   10 |         7   6   U   Y           N
   11 |                         J   H  spc
   12 |         8   5   I   T   K   G   M   B
   13 |         9   4   O   R   L   F   ,   V
   14 |         0   3   P   E   ;   D   .   C
   15 |         <   2   -   W   +   S   /   X
   16 |         >   1   =   Q   *   A  atr  Z
   17 |        bs  esc ret tab     cap

also, there is another set for the system keys

             18   19   20   21
   22      reset opt selec start

The article implies that these numbers refer to those of the wiring trunk
at the 400's membrane end.  I haven't figured out yet the values for the
extra pf keys, but it's a pretty good bet that they sit in the blanks for
rows 10 and 11.

-dave

-- 
-------------------------------------------------------------------------------
David Hsu						Across the net...
USnail: Communications & Signal Processing Laboratory	hsu @ eneevax.umd.edu
	Department of Electrical Engineering		hsu @ sphinx.ee.umd.edu
	University of Maryland				hsu @ mustafa.ee.umd.edu
	College Park, MD 20742				hsu @ umd2.arpa
BITnet: CF522 @ UMDD					hsu @ mit-prep.arpa

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