[GreenKeys] Modems, CCU's and Tractor feed issues

[John Ball]

>Tractor feed unit only works with sprocket fed paper -- there is not a
friction feed option or >adjustment.
>
>You're not seeing multiple line feeds, you're seeing a form-feed character
activating the form feed >mechanism.  Form feed is 0x0C, which is Ctrl-L and
also Ctrl-,
>
>What is punching when you press comma? That will tell us if it's a
keyboard, printer or function bar >problem.

Very well then on the paper. I'll figure out something with the carton of
paper.

Huh, I never actually noticed that until now but you're right. The
difference between a comma and a form feed is is the last three bits.
Cranking out a piece of paper tape I can clearly see when I do a CTRL+L, a
line feed and a comma so the keyboard is properly triggering, the punch is
properly punching but the printer is missing those last three bits and
interpreting it as a form feed. Just to write it off as a variable and
because I did swap CCU's at least once I'll open the machine up again
tomorrow and make sure that all the wiring is in order and I didn't bump the
contact block or something.

-John