[GreenKeys] Interface ASR33 to Linux serial port

[Eric Moore]

Linux agetty is a mess with teletypes.

What RS232 adapter are you using?

There are a couple troubleshooting options:

1) easiest, turn on incorrect password logging and see what password is
being received

2) bit harder, use a protocol analyzer to see what is happening on the line

7 bit can be an issue, agetty may not support all flags in ubuntu latest,
all kinds of fun issues I have seen.

I generally use socat nowadays instead of real getty with linux. Much
easier to set the options with stty then connect the teletype to bash or
whatever command (telnet) directly.

-Eric

On Thu, Jan 4, 2024, 2:52 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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