[GreenKeys] Model 15 without blank key

[E.]

I’m a little confused.  My blank key strikes onto the paper a blank nothing — in other words, it’s just a blank on that type hammer that gets struck.  I saw some others here that said their blank key starts/stops the loop and other that says it locks(?)?  I’ve lost track… so my question is, what *does* a blank key do on 15s/19s when pressed?  Are some 15s/19s engineered differently when it comes to it???


> On Nov 20, 2021, at 9:16 pm, Harold Hallikainen <harold at w6iwi.org> wrote:
> 
> Also, all 5 bits are space. I suspect they made that not print anything so
> that an open loop (machine "running open") would not result in a character
> being typed over and over. If they wanted to get even more mechanically
> complicated, they could stop on the lack of a stop bit (a space in the
> stop bit position) and wait for the loop to go back to mark, then wait for
> the start bit of the next character. A stop bit being space results in a
> Framing Error in a UART. On a Teletype, it just never stops.
> 
> Harold