[GreenKeys] Tell me about TTY Line Length

[Ralph Mowery]

The printer manual for the 15 printer says the normal length is 72 characters, but it can print as much as 76 characters depending on the left margin adjustment.

 

 

Years ago when I wrote a computer program to operate on an 8080 processor board I set it so that after about 65 characters it would look for a space and if so would do an automatic  CR CR/LF LTRS LTRS.   If no space was found , it would send the same sequence at 72 characters to keep from printing a black box at the end of the line.  Too bad some of the computer programs do not seem to send any CR/LF at all.

The 2 CR was for ham transmissions to make sure one of them made it. Just one line feed usually, and then two LTRS to give the old 15 plenty of time to get back to the left  side of the paper.  If the first character was a FIGS, then that could be subsisted for the LTRS.

 

I have no idea about the 28 but I would think it would have a line length of at least 72 characters.

 

So when sending set the line length to 72 characters and no more.

 

Ralph KU4PT

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of ad7i
Sent: Thursday, April 16, 2020 3:28 PM
To: greenkeys
Subject: [GreenKeys] Tell me about TTY Line Length

 

Greetings --

 

In testing my model 15 and 28RO, it looks like both will print 72 characters per line.  But buried deep in my brain, from some long forgotten place, I seem to recall that the max TTY line length was 68 characters.

 

So my question for my fellow TTY enthusiasts is, when preparing text for transmission by TTY, what's the recommended line length to use, and why?

 

73, Paul, ad7i

 

 

 

 

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