Message 23279 in IBM.WW
From: G8MNY
Date: Sat, 30 May 26 08:23:00 Z
Newsgroups: IBM.WW
Subject: IBM XT/AT Keyboard connections
Message-ID: <61095_GB7CIP>
Path: N2MH4|GB7BED|EI2GYB|GB7CIP
R:260530/0832Z 31789@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260530/0831Z 12148@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260530/0831Z 54729@EI2GYB.DGL.IRL.EURO LinBPQ6.0.25
R:260530/0823Z @:GB7CIP.#32.GBR.EURO #:61095 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : IBM@WW
5 Pin DIN Looking at Plug Pins Function
or Computer socket cons.
5 3 4 1 CLOCK
2 1 2 DATA
3 RESET (not)
^ 4 GND
5 +VE (e.g. 12V feeding keyboard +5V Reg)
NB. AT & XT keyboard use quite different data code sets, so some early
keyboards had a switch to change over between these. The encoding is not only
different per key, but the AT one sends 1 code for key down & another code for
key release, whereas the XT ones just keep repeating the keydown code.
------------------------------------------------------------------------------
PS2 Modifications.
Fitting a normal DIN on a keyboard cable in place of the PS/2-type connection.
Which avoids the expense of an adapter.
Keyboard End PS/2 DIN connection 5-pin DIN
looking into the plug Function
_ _ _ _ _ _ 1 NC 1 Data 1 Brn
1 2 3 4 5 6 2 White 2 No Connection 2 Wh
3 Black 3 Ground 3 NC
4 Brown 4 5V DC 4 Bk
5 Red 5 Clock 5 Red
6 NC 6 No Connection
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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