[GreenKeys] shockingly basic question - Teletype Model 33 ASR

[Andy KN4UCL]

I think I am still missing a trick or two here...I tried every combination
of 8 and 7 even/odd/none/mark/space and I get no printing at all with 8
bit, but moderately bad spelling errors with 7.  See attachment below...
presumably this means I have the non-parity keyboard?

thanks in advance for your thoughts!
Andy

On Sun, Jan 31, 2021 at 8:18 PM Mike Douglas <deramp5113 at yahoo.com> wrote:

> If you select 8 bit with mark parity on your terminal server, you’ll
> probably get the 8N2 timing the Teletype requires (the mark parity bit
> serves as the first stop bit).
>
> Mike
>
> On Jan 31, 2021, at 7:11 PM, Andy KN4UCL <kn4ucl at gmail.com> wrote:
>
> 
> 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.
>>
>>     ---
>>
>>     "Ya can argue all ya wanna, but it's dif'rent than it was."
>>     "No it ain't! No it ain't!  But ya gotta know the territory."
>>         Meredith Willson, The Music Man
>>
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