[GreenKeys] ASCII <-> Baudot algorithm

[Ed Sharpe Archivist for SMECC via GreenKeys]

OK  and  ours are all UPI machines (lucky us we now have 3   hoping  for an 
AP machine  soon though!) So  may or may not  be  same  protocol as  AP or 
maybe  not on the  unshift.  all advice appreicated!
 
 
In a message dated 8/2/2015 5:49:57 A.M. US Mountain Standard Time,  
kb8tq at n1k.org writes:

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.>>
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