[GreenKeys] [External] Model 33 Issue

[Jones, Douglas W]

From:  Aidan Riley <w9pog73 at gmail.com> -- Wednesday, July 30, 2025 2:56 PM

> my Model 33, ... a line feed character, it sometimes will not fully feed the line

I have the same problem with the 33 I've been working on.  I've concluded that I need to adjust the length of the linkage from the LF decoder (under the code bars) to the ratchet that feeds the paper.  There is a nice adjustment point for that, typical Teletype style, a bolt you loosen just a little and then some pry points where you can, with a screwdriver, pry the link a bit longer or shorter.

The problem?  The screw I need to turn to loosen that pry point is on very tight, and the head of the screw faces one of the carriage supports so closely that I can't use a screwdriver on it.  Like many TTY screws, it has a hex head, but the clearance doesn't even let me slip a box wrench over it.  I'm tempted to manufacture a custom wrench, unless someone has a better idea.

(Oh yes, I accidentally left it plugged in while out of the room, and it now chatters continuously when the switch is off.  I also need to trouble shoot that.  Ick.)

This will be an issue in a month or two, because we finally got the U of Iowa PDP-8 to execute code from memory.  I believe we'll be ready to celebrate it's 60th birthday by running some demos on it.  It was delivered to the U of Iowa in late 1965.

                  Doug Jones