[GreenKeys] shockingly basic question - Teletype Model 33 ASR

[Andy KN4UCL]

Thanks guys for the responses - a lot of great info for me to digest!

My terminal server (Equinox ELS-16) allows me to define character size as 7
or 8 bits, and to set parity as NONE, ODD, EVEN, MARK or SPACE.

I don't seem to have the ability to specifically state the number of stop
bits, however.

Anyway.. I'm going to crack my Teletype open and confirm exactly what's
going on.
cheers!
Andy

On Sun, Jan 31, 2021 at 5:43 PM Keith Lueck <kwlueck at swbell.net> wrote:

> Jim & Wayne are spot-on, of course.  I learned the hard way that you best
> include the parity bit - even though the 33 doesn't give a whit about
> parity...
> My machine was occasionally producing errors when I was feeding it 7 N 2.
> Wayne Durkee set me straight, and, viola, when I sent it 7 M 2, everything
> was 100% ducky.
>
> On Sunday, January 31, 2021, 03:32:30 PM CST, Jim Haynes <
> jhhaynes at earthlink.net> wrote:
>
>
> All the 33s and 35s generate 11 unit code.  1 start bit, 7 data bits, one
> bit which may be even parity or may be marking, and two stop bits.  That's
> where 110 baud comes from. 100 wpm = 10 chars/sec and each char contains
> 11 bits.  The reason for two stop bits is the difficulty of making a
> mechanical selector that is reliable at 100 wpm.
>
>     ---
>
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