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G8MNY > IBM 08.03.04 19:54l 34 Lines 1384 Bytes #999 (0) @ WW
BID : 47308_GB7CIP
Read: DK3PM GUEST DC9BM
Subj: IBM XT/AT Keyboard connections
Path: DB0FHN<DB0RGB<DB0SL<DB0FSG<DB0PV<DB0MRW<OK0PKL<OK0PCC<OK0PPR<OK0PPL<
DB0RES<ON0AR<VK3TE<ZL2TZE<GB7YFS<GB7CIP
Sent: 040308/0921Z @:GB7CIP.#32.GBR.EU #:47308 [Caterham] $:47308_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
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 (eg 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
/QSL
73 De John, G8MNY @ GB7CIP
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