[GreenKeys] Model 28 stock ticker progress

[W2HX]

[This may contain: two pieces of white paper with numbers printed on them, side by side stock photo]






73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos





________________________________
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> on behalf of Peter Gottlieb <hpnpilot at gmail.com>
Sent: Tuesday, May 20, 2025 8:05 PM
To: Greenkeys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] Model 28 stock ticker progress

Update:

I have made some progress on several fronts with this machine.

Many thanks to John W9DDD I now have type boxes.  They are set up for
weather symbols which is interesting.  The character ordering is
completely different than the standard.

After running and oiling the machine seems to be working.

I made repairs to the plastic front where it attaches to the frame and
those areas were cracked and missing.

I programmed an Arduino to send characters to the 28.  For now I just
step through all 64 possible characters.  The speed of the unit is
indeed 135 Baud and taking a video of the code bars shows them stepping
through the binary possibilities.  So that is working and what I want to
send gets to the code bars.  That's a good first step.

But the character encoding is very, very odd.  I'm not sure if I should
rearrange the type box or not.

And I am confused about the printing in two rows.  The 573-140-100
manual I have doesn't cover that.  But when I stepped through all
characters the first half were on the bottom of the tape and the second
half were on the top.  But not the same, they have different characters
printing.  So there must be a shift code.

Once I understand this I can make a map and control what I print from a
look up table but for now it's very confusing.

I tried going to Staples for a typewriter ribbon but all I could find is
a little calculator ribbon but it was 1/2" and I could modify the spools
so it's at least printing until I can find a proper ribbon.

I also need to locate some 1" paper tape.  For the moment I am cutting
1" strips from regular paper.

Peter


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