[GreenKeys] WTB: Model 15 Auto CR+LF

[jhaynes@alumni.uark.edu]

Of course the better way, in the light of modern technology, is to use a
microprocessor that receives the text and inserts a CR-LF-LTRS between
words.  Wonder if you could do that with a BASIC stamp?  Another reason 
for doing it this way is that you could hold up the following characters
so they don't get printed as the carriage is on its way back.  Maybe.
I haven't thought about the timing issue, but maybe using 7.00 unit code
the printer would run faster enough to allow it to catch up to the input.
Maybe you could find some 75WPM gears and then there would be no problem
with running the printer faster.

Making the parts by hand is rather a tough job, as you'd have to make
the function bars that go behind the vanes.  But if you must go that way
get back to me, as I have some but not all of the parts.

Another possibility - back in the days of the Model 26 on radio.  The
Model 26 never had, to my knowledge, a Teletype auto CR-LF.  Somebody
made a product he called the Auto-Mate 26 that basically had a switch
that was hit by the carriage and a solenoid that tripped the CR-LF in some
manner that I don't recall.  (But I think it was documented in RTTY
magazine.)  I'm not sure if anybody ever did that for a Model 15.
If you did this on a RO machine, so you have the space free that is 
normally occupied by the keyboard, I could imagine making something
with a couple of hooks that hook over the CR and LF push bars - or
maybe you have to pull them up rather than down.  Anyway a yoke with
the hooks, and a string to pull it up or down and a solenoid to pull
the string.

Another case you want to deal with is the CR not followed by a LF.  I
don't remember if the M15 auto-CR-LF kit deals with that.  I reminds me
of a mod that some of us did to Model 28s for radio work.  Irv Hoff
had something to do with working out the details, which I no longer
remember correctly.  One reason Irv got involved that some mischievous
people were starting up his autostart machine and sending bunches of
linefeeds to throw out all the paper.  So this change, which I believe
did require putting in some of the auto-CR-LF parts, did something like
disable carriage return, do both CR and LF on receipt of LF, and suppress
LFs after the first until there had been some other character.  Or maybe
it did CR and LF on receipt of CR and ignored LFs.  This does mess up
the ability to do some picture things that require overstrikes.  Such
as    OO  CR  ..   "here's looking at you, baby"

If you use the K6STI RITTY program he already puts out a cleaned-up
Baudot signal while receiving, so you can drive a printer from that
and not be bothered by overstrikes.  I wish we could get the author of
MMTTY to do likewise, and maybe with enough requests he will.