[GreenKeys] ASCII <-> Baudot algorithm

[Bob Camp]

Hi

Most (but not all) of the machines we now have went through a lot between the Teletype factory and
getting to our greedy hands. Adding unshift on space (and wiring it out) were very popular 
things to do on a TTY over the years. The “assume nothing” approach is about the only
rational way to go. Send the data so it will print the same with or without unshift on space
enabled. That’s not just true of doing it in software ….

The same approach applies to the <CR><CR><LF> sequence at the end of each line. You can
never be sure just how fast the carnage actually returns (and stops bouncing) on the other end. 
Should it need all that time? Probably not. Are there tired old machines that print better when 
you do it? - yup

Bob 


> On Aug 2, 2015, at 5:09 AM, Sheldon Daitch <SDAITCH at bbg.gov> wrote:
> 
> Maybe, but to the best of my knowledge, none of The Associated Press M-15 machines ever had unshift on space hardware installed.
> 
> My guess is the thinking was that while it might have saved a few seconds during the course of a day's 24-hour news traffic, the extra maintenance required for the USOS hardware simply wasn't worth the trade off.
> 
> I also seem to recall the AP would supply an upper case lower case chart for the few times when machines might miss a letters shift and someone would have to "translate."
> 
> 73
> Sheldon
> 
> 
> << Whereas in more ordinary communication service strings of figures with spaces interspersed are fairly rare, so it saves time to have the machines unshift on space and not have to send the LTRS character.>>
> ______________________________________________________________
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html