[GreenKeys] CRLF or not CRLF?

[Sheldon Daitch]

I am thinking the Associated Press convention for the 5 level wire service was a CR-CR-LF.

That took care of most of the slowest machines.  Anything slower than that probably needed service.

There were some Extel printers that required the print head to return to the left and hit an electronic contact before the unit would print the next line.

You could hold the print head to keep it from returning to the left margin point and when released, the printer would print at about 50% faster than normal transmission rates until the buffer was empty.  I am thinking it would store about two lines of 5-level text.

I suppose one feature of this with the Extel machines is if there was a paper jam in the unit and the print head did not return to the left margin position, it would not print or do anything until cleaned up.
73SheldonWA4MZZ

      From: Andreas Müller <dd1lm at t-online.de>
 To: greenkeys at mailman.qth.net 
 Sent: Sunday, July 30, 2017 2:03 PM
 Subject: Re: [GreenKeys] CRLF or not CRLF?
   
Hi,

actually I was assuming that transmitter and receiver are handling the same 
character at the same time, so also CR and LF are supposed to be there at the 
same time also.
Besides, if you use CR + LF in this order, a slower returning carriage has 
time to return while LF is already done.

Regards,
Andreas, DD1LM


   
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