My *Third* CT-1024 Terminal

[KC9UDX]

It'd have to be sing and whistle, wouldn't it? Aside from Tuvan throat singling, I didn't think a human could do DTMF. Mostly, my dial phones are in the shop and garage, so it isn't too much of a problem to put the phone down and go to a different room. Both have been around a loooong time--one a Trimline and the other a 500 series wall phone. You just can't kill the things.
At any rate, @falter, if you have the facility, check the baud clock for your CT1024--as I recall, they were none too accurate. It should clock at 16x the bitrate. That'd be the UART pin 17, which, at 1200 bps, should read 19.2KHz. Any significant error can produce some bizarre results.

It was throat singing.

 

[Chuck(G)]

It was throat singing.

Brass and woodwind players are well acquainted with multiphonics---playing and singing at the same time. It's fun for the player, but audiences usually don't know what to make of it--it's kind of eerie.