from
The Free On-line Dictionary of Computing (8 July 2008)
Seiko RC-4000
A wristwatch with an {EIA-232} interface. A clip fitted round
the watch and made electrical contact. This clip had a socket
for a stereo style jack lead the other end of which was a
25-way {D-type} connector. The lead allowed you to enter
phone numbers etc. into the watch without having to play with
tiny buttons. It also meant if the battery on your watch ran
out you could restore the data without having to type it all
in again.
It was around the era of the 8-bit home computers like the
{Spectrum}, {BBC Microcomputer}, {Apple II}, {C64} - the
1980s.
(1995-01-30)