Kaypro II keyboard? (problem)

From: Randy McLaughlin <cctalk_at_randy482.com>
Date: Mon Feb 21 16:08:33 2005

From: "Dave Dunfield" <dave04a_at_dunfield.com>
Sent: Monday, February 21, 2005 3:45 PM
> Hi again Guys,
> My Kaypro II keyboard started giving me some grief today...
> There are two symptoms:
> 1) The modifier keys stop working, no Ctrl, Shift (either
> side) or Caps-lock.
> 2) Keyboard generates spurious keypresses when other keys
> are pressed, for example, pressing BACKSPACE seems to
> generate a whole string of keystrokes, although pressing
> very lightly usually works.
> The interesting part is that it works correctly for a few
> seconds after power-up, and then begins to exhibit the
> symptoms above (sometimes it takes a minute or two).
> I took it apart, and found many sets of pads, and with foil
> disks that press down on them - at first I though it was for
> contact, however the foil disks have a film to make them non-
> conduction, so I am assuming it's capacitive (?)
> Cleaned all the pads, disks and board in general, put it back
> together with no noticable change in behaviour.
> Anyone run across this before? Is it a know problem? Is there
> a known solution?
> Regards,
> Dave
> --
> dave04a (at) Dave Dunfield
> dunfield (dot) Firmware development services & tools: www.dunfield.com
> com Collector of vintage computing equipment:
> http://www.parse.com/~ddunfield/museum/index.html

Check the coiled cable, it would often go bad causing that kind of problem.
Some phone cords work others are "reversed", try a phone cord. If you have
a crimper and a phone cord doesn't work cut off one end and crimp on a new
plug (the other way around). Please note these are the small 4 prong
modular connectors (I don't remember the number just not the RJ-11).

Basically it is a TTL serial device (I think it is either 300 or 1200 baud I
can't remember).

Received on Mon Feb 21 2005 - 16:08:33 GMT

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