[GreenKeys] Interface ASR33 to Linux serial port

[Michael Katzmann]

I've got a PiDP11 with a 33 attached.
Usually the 33 is driven off the PDP11/70 SIMH emulator.
I tried running the agetty command as you showed and it looks like it
worked (except bash is confused for some reason)
The OS is Raspbian (32 bit) but its pretty close to Ubuntu (both based on
Debian). I favour Fedora myself!

Michael


[image: tty33.jpg]

On Thu, Jan 4, 2024 at 3:52 PM Tom Lake <tlake at twcny.rr.com> wrote:

> I have an Ubuntu 23.10 system with agetty running on its eight serial
> ports. I can hook up most terminals to the ports and login to a bash shell.
>
> When I try to use a Teletype ASR 33, however, I get the login prompt and I
> answer enter the username. If I hit Return, nothing happens. If I hot Line
> Feed, the Password prompt is shown.
>
> After I enter the password (all uppercase) Incorrect password is shown.
>
>
>
> Since the prompts are displayed properly, I’m pretty sure the baud rate,
> BPS and stop bits are correct. What else can I check?
>
>
>
> I start agetty this way:
>
>
>
> agetty  -L -U ttyUSB0 110 tty
>
>
>
> The -L means it’s a dedicated line, not dial-in. The -U means the terminal
> is uppercase only and some upper/lowercase conversions should be made.
>
> The port is a USB to serial port (ttyUSB0), baud is 110.
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-- 
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