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one of my macintosh plus have such a port for :
KODAK DATASHOW HR/M LCD PROJECTION PAD
http://www.biocomp.net/o43488.htm
KODAK DATASHOW HR/M LCD PROJECTION PAD
http://www.biocomp.net/o43488.htm
You're right. It's a Kodak / Sayette datashow pad connector. It was a very common mod in the day. If you open the Mac, there will be a little video daughterboard in there connected to the socket.one of my macintosh plus have such a port for :KODAK DATASHOW HR/M LCD PROJECTION PAD