[GreenKeys] CRLF or not CRLF?

[Richard Knoppow]

    Thank you, this answers the questions I had about actual practice.

On 7/30/2017 7:30 PM, Jim Haynes wrote:
>> On 30-Jul-17 16:04, Richard Knoppow wrote:
>      I have been following this discussion with great interest. I also read
>> over some patents for automatic CR-LF. I wonder how this was handled 
>> on radio circuits to avoid having two CR-LF at the printing machine. 
>> Of course I have been aware that many machines were set up for 
>> automatic CR-LF but until now had not thought about how it actually 
>> worked and some of the problems created by it.
> 
> It was typical to set up typing units for the right margin at the 72nd
> character position.  Which means the margin bell rings somewhere before
> than, maybe 67 characters.  So the auto CR-LF would be set up to operate
> on maybe the 75th character and the right margin stop set a little beyond
> that.  If the sending operator is paying attention the margin bell then
> he will send CR-LF as soon as possible after the bell rings, and
> definitely short of the 72nd character.  So the machine never gets beyond
> 72 characters unless a CR is missed.  Then the auto CR-LF will catch it
> beyond the normal place and operate.
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL