Fred:
...
> As I said in an earlier post there is an article on using a (different)
> Sun mouse on Linux. The protocol used was msc. From looking at the
> output with an oscilloscope that protocol does appear close if not correct.

Type-4 and -5 mice seems to been made by mouse systems:
https://www.oldmouse.com/mouse/mousesystems/sun.shtml
http://www.telltronics.org/hardware/SunMouse.html

My own sun moues is a type compact-1 and is done by Logitech.

So your primary choises would be msc and mman (in gpm parlance).


> As I said in an earlier post I haven't been able to get gpm to do
> anything with the pointer.

Have you tried:

mouse-test [ device ]

Regards,
/Karl Hammar