[GreenKeys] Teletype Model 33 Serial Configuration

Aidan Riley w9pog73 at gmail.com
Thu Dec 4 12:17:15 EST 2025


Good afternoon all,

I'm currently working on connecting a Model 33 Teletype to a modern Linux
system. I already have input/output working through a USB serial adapter
(PL2303, supports down to 75 baud).

I'm attempting to connect it as a terminal. I'm using the following
commands to set up and start the terminal connection:
stty -F /dev/ttyUSB0 iuclc
sudo agetty ttyUSB0 110,E2 tty33

I can successfully make the connection and connect to the user "TTY" that I
set up.

I know that the teletype is sending all uppercase characters, and my
understanding is that using the iuclc setting with stty should
automatically convert all characters to lowercase. However, this does not
seem to be the case, as attempting a command like "LS" just returns that
the command was not found (because "LS" is not a command, only "ls" is).

Does anyone know what settings I may need to use to get this to work?

Thanks,
Aidan W9POG
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