[GreenKeys] Handling CRs - NON-Overline Mod kit

Sun Aug 27 08:41:11 EDT 2017

Eric

You have probably noted that the type box in your 28 has a number of 'empty spots' in it.  This is where
the hammer strikes for various non-printing functions:  Space, LTRS, FIGS, CR, LF, Blank, Bell, etc.
So, if you have implemented the 'Non-Overline' thing, the LF may not do a Line Feed, but the machine will
go through a 'print cycle' and the hammer will strike in one of the 'empty' spots.  

I suppose it is possible to have the machine do a Line Feed upon receiving the LF character, but from what
I recall, it is the CR character that does both.

One of the few reasons you might want to have independent LF and CR would be for RTTY Art, which sometimes
USES overlining to create shades that just don't occur with any characters in the typebox.  There are a
number of famous 'artworks' that the creators took a lot of time creating and experimenting with different
character overprint combos to achieve a wide range of 'shapes' for their work.

If you have contesting in mind, forget that!

- - - -

BTW, does anyone else have a problem getting mail directly to Eric, or am I the lone exception that runs
into the mystical mail services 'reject' system?

73 all,

Ralph - W8ROI

- - - - - - - -

On Aug 27, 2017, at 3:38 AM, Eric NO3M wrote:

> Ralph
> 
> Thanks for the information regarding the NON-overline mod.  I found this page with some info on the topic:
> 
> https://www.smecc.org/teletype_model_28_stunt_box_secrets_and_data!.htm
> 
> It appears to be an alternative "no parts" modification, but your solution seems to be more elegant in that CR will still be a "functional" key (CR+LF) and conform with current practice.  I can't think of any scenario in RTTY contesting where a CR should not be accompanied by a LF, but I have yet to see a LF sent alone or any reason to do so for that matter.  What is the LF behavior as a result of the mod you suggested, I assume unmodified?
> 
> ** Anyone have the NON-overline mod kit or parts to do what Ralph is suggesting? **
> 
> I do plan to do a fair amount of contesting with the M28, but after the overline horrors of this weekend in the SCC... definitely need to deal with the lack of line feeds!
> 
> Thank you.
> 
> 73 Eric NO3M
> 
> 
> On 08/27/2017 02:18 AM, Ralph Irish wrote:
>> 
>>> From: Ralph Irish <w8roi at wowway.com>
>>> Date: August 27, 2017 2:09:51 AM EDT
>>> To: no3m at no3m.net
>>> Subject: Re: [GreenKeys] Handling CRs
>>> 
>>> Eric
>>> 
>>> It is possible to equip the Sequential Selector of a Model 28 so that a Carriage Return (CR) will also produce
>>> a Line Feed.  (LF)   This is called 'NON-Overline'.  It requires less than 8 parts to be installed, in most
>>> cases, and I suspect that someone on GreenKeys may have some 'Mod Kits' for this purpose, or at least the
>>> required parts.  You might put out an inquiry about getting NON-Overline for your machine.
>>> 
>>> Or, it would also be possible to run all incoming data through a simple program which would sense a CR and
>>> follow it with a LF.  Another caution, though.  Many 'old time operators' will use two CRs as assurance that
>>> the print box will be in place before printing the next line.  So, any computer routine would have to ignore
>>> a second CR so as not to have a blank line between each printed line.
>>> 
>>> I think that mechanically, that was part of the "NON-Overline" mod kits.  A few parts prevented a second LF
>>> from the second CR.
>>> 
>>> - - - -
>>> 
>>> Some older TTY gear also had a feature of "Unshift on Space" so that after sending something in the "FIGS"
>>> situation, a space character would both cause a word space  AND  a downshift to letters.  This also caused
>>> a lot of problems for people whose printers did  NOT  have the Unshift on Space feature.  That, too, had a
>>> "Mod Kit" from Teletype I think.  This 'feature' is often abbreviated as  USOS  for Unshift on Space.
>>> 
>>> Hope this helps.
>>> 
>>> 73,
>>> 
>>> Ralph - W8ROI
>>> 
>>> - - - - - - - -
>>> 
>>> On Aug 26, 2017, at 10:10 PM, Eric NO3M wrote:
>>> 
>>>> I recently acquired a 28KSR and fired it up today in the SCC contest.  I notice that the overwhelming practice is to use CRs in macros but not insert LFs, which causes the printer to type over previous text.  It was so bad at one point that a particular station I was monitoring went through 3 QSOs and all the text (including his QSO partners) was printed on the same line!  Completely unintelligible.
>>>> 
>>>> Any thoughts on how this could be handled on the receiving end?  The current TU is a Flesher TU-170.
>>>> 
>>>> 73 Eric NO3M
>>>> 
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>> 
>> 
>> 
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