> Fred:
>> On 4/23/22 12:53, karl@??? wrote:
> ...
>>> If so, press Ctl-Alt-F2 buttons simultaineusly to get to a console.
>>> There log in as root
>>> and then try one of
>>>     gpm -b 1200 -m /dev/ttyUSB0 -t msc
>>>     gpm -b 1200 -m /dev/ttyUSB0 -t sun
>>>     gpm -b 1200 -m /dev/ttyUSB0 -t mman
>>> and move the mouse to test.

> ...
>>> B, try inputattach to make the mouse appear as a /dev/input/* device
>>>      and be automatically included by X11, I haven't tested this. See

>>>      https://wiki.archlinux.org/title/Serial_input_device_to_kernel_input
>>>      https://sourceforge.net/projects/linuxconsole/files/
>>>      https://help.ubuntu.com/community/SerialMouseHowto
>>>      https://wiki.alpinelinux.org/wiki/Serial_Mouse
> ...
>> There is some progress. The inputattach package in Devuan apparently
>> doesn't have a config file.  Specifying the baud on the command line
>> results in an invalid baud message. inputattach does work with the Sun
>> mouse but the middle button doesn't work.  I tried msc and sun protocol
>> and both work the same.  I may try some other protocols but I suspect a
>> bug in inputattach.  Maybe I should contact the maintainer?

>         switch(baud[i]) {
>         case -1: break;
>         case 2400: type[i]->speed = B2400; break;
>         case 4800: type[i]->speed = B4800; break;
>         case 9600: type[i]->speed = B9600; break;
>         case 19200: type[i]->speed = B19200; break;
>         case 38400: type[i]->speed = B38400; break;
>         case 115200: type[i]->speed = B115200; break;
>         default:
>             fprintf(stderr, "inputattach: invalid baud rate '%d'\n",
>                     baud[i]);
>             return EXIT_FAILURE;
>         }

> $ grep -A2 msc inputattach.c
> { "--mousesystems",     "-msc",         "3-button Mouse Systems mouse",
>          B1200, CS8,
>          SERIO_MSC,              0x00,   0x01,   1,      NULL },

>         case 1200: type[i]->speed = B1200; break;