[GreenKeys] CR LF, etc.

[John Nagle]

> From:"hwhall at aol.com"  <hwhall at compuserve.com>
> Subject: Re: [GreenKeys] CR/LF trivia, in historical context
> 
> radio amateurs made it a habit to send CR CR LF with the idea that 2 CRs
>   gave sufficient time for even a slow machine to get back to the start
> of the line.
> 
> Wayne
> WB4OGM
> 
> On Tuesday, July 22, 2025 at 09:24:57 AM MDT, Jomar Quilatan<jomarquilatan at gmail.com>  wrote:
> 
> Was it ever historically customary to add some kind of diddle or buffer
> between transmission of the CR and LF in RTTY, or is that just a modern
> courtesy in some feeds?? I do sometimes wonder if the immediate LF
> after the CR would, over time, "wear out" or cause occasional issues
> lest a machine's CR mechanism be on the slower end to somehow miss
> the LF.
> 
> I'm wondering if there's any way to tweak MMTTY to interpret newlines
> with a little bit of buffer between the CR and LF since it seems
> like it doesn't give my M26 a breather on newlines...haha.

The spec for the Model 15 is that a carriage return should take less 
than two cycles, so CR LF should be enough. If it takes longer than
that, it's time for maintenance.

In the ASCII era, things got a lot more complicated, with faster
speeds and wider carriages. Computer output had to add NUL characters.
I used to write drivers for that sort of thing.

There was once a ham thing for sending CR CR LF LTRS LTRS at the
end of each line, for really bad reception. That was never
wire-line practice with Western Union.

				John Nagle