[GreenKeys] Teletype Model 33 Serial Configuration

[Hugh Pyle]

Does `stty lcase` do what's needed?

My own setup isn't quite as "raw" because I implemented downcasing in
firmware in my USB driver (
https://github.com/hughpyle/ASR33/blob/master/hardware/README.md).  But I
did write some rough notes that might be useful for you,

- customizing the getty (
https://github.com/hughpyle/ASR33/blob/master/rpi/README.md)
- kernel patches for CRDLY, NLDLY and XCASE (
https://github.com/hughpyle/ASR33/tree/master/rpi/kernel)


Hugh AC1MQ


On Thu, Dec 4, 2025 at 12:17 PM Aidan Riley <w9pog73 at gmail.com> wrote:

> 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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