[Yaesu] FT100 CW Keying Input?

[Steve Harrison]

I promised a friend I'd build a computer keying interface cable for his
FT100; but he's presently already using the paddle input to the built-in
keyer and didn't mention anything about a separate keyer input jack. He
says the radio came with (but I just noticed he didn't say he's actually
using, as yet) the Band Data Pigtail cable.

What plug do I need to put on the keying interface for his radio: ordinary
1/4" phone plug, or is there another jack with direct keying input
connection? I was planning for this to just be a DB25 to plug into his
computer's LPT port, containing a simple transistor switch with RG174
output cable to plug into the radio. It'd be nice to be able to leave the
internal keyer's paddle hooked up. I've never used an FT100 so don't really
know anything about it.

Thanks,
Steve, K0XP