Don Maslin wrote about Kaypro II keyboard cables:
A telephone handset cord makes a very good replacement
provided
you can find a convenient length and a color that you like :)
Not really. The wire in the telephone handset cords has a higher
resistance than the original Kaypro cords and won't work reliably. They
will sometimes work for a while. You can try it yourself by checking with
an ohmmeter.
I used to be a Kaypro dealer and this was a frequent problem when
customers replaced the cord with one that looked the same.
Paul Pennington
Augusta, Georgia