I have a GW-2000 machine with FreeBSD on it, and a true, "green",
Microsoft mouse that plugs into the GW-2000 "mouse port". It doesn't appear
to be /dev/mse0, nor /dev/tty00, nor /dev/sysmouse, nor /dev/mouse.
When I bring up XFree86-3.2, I have no mouse capabilities, and have tried a
couple of different XFree86-3.2 mouse (protocol) configurations.