External DVK

[Tony Brock-Fisher]

CT supports external DVK's with up to 4 messages. The F1-F4 buttons
are mapped to 4 bits in the selected LPT port. This is documented
in the manual. I use this feature successfully with a homebrew DVK.
Note that the auto-repeat function is not supported with external
DVK's, and the escape key does not stop an external DVK in mid-play.
(Hint Hint, K1EA).

-Tony, K1KP, fisher@hp-and.an.hp.com

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