13 Feb
2014
13 Feb
'14
4:22 p.m.
On 13 February 2014 15:07, allison <ajp166 at verizon.net> wrote:
It was 7bit encoding and the usual setup was 8n2, I
know of no serial
device that did 7N3.
Correct, the printer is a 7-bit device which really doesn't care about
the high (eighth) bit. E.g. why I said to imagine it as 7N3. Because
the printer doesn't care if you're using 7E2, 7M2, 7S2, 7O2, or 8N2.
Also the keyboard was Odd/Even/Stick (or no parity).
I hadn't heard of the keyboard coming in odd parity. Just even parity
and mark parity.
IT was the same for keyboard and printing as the Punch
was 8 Level
And the 8th level was parity in some systems but data for others.
It was 110 baud. To many years of maintaining and using one.
Punch and reader are still 8-bit clean, so in local mode if you punch
some tape on a parity keyboard you'll get even parity punched data.
Stick it in the reader of a mark parity machine and it'll print just
fine.
That's why the teletypes were used with minis as both tape readers and
punches, the computer can read and produce any form of punched tape
output.
Model 35 machines are similar if I recall, though they do have
significantly different mechanics, and support a lot more features
than the 33 (being part of the 28 line they had access to a lot of the
28 features, like vertical tabulation).
Cheers,
Christian
--
Christian M. Gauger-Cosgrove
STCKON08DS0
Contact information available upon request.