[GreenKeys] Hi-speed Teletype reader...

[Wayne Durkee]

Some 33's will run fine with 1 Stop bit from the computer. Others need the 2 bits. Perhaps condition of the selector clutch or main shaft.

Of course, 33's will only generate 2 bit Stop on transmit.

73,

Wayne
KB1FDW

> On August 30, 2017 at 11:26 PM Jim Haynes <jhhaynes at earthlink.net> wrote:
>
>
> In the late 1950s the military decided to standardize on power-of-two
> multiples of 75 baud. Thus the standard speeds were 75, 150, 300, 600,
> 1200, 2400 and up. 75 fit nicely with the Model 28 running at 100 wpm
> which was 74.2 baud. Going to 8-level, with a 100 wpm machine, the
> baud rate would have been 100, except that the machines wouldn't
> reliably operate with only one STOP pulse, so they had to transmit two
> STOP pulses for a total of 11 bits and that required 110 baud. Then
> IBM had its Selectric terminals with something like 134.5 baud, for
> reasons of their own. Once we got away from all that mechanical stuff it
> was possible to make printers running 300 baud 8-level and then 1200.
> And with CRT terminals it was possible to go even faster.
>
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