[Serial mouse doesn't work in X Windows]
> why?! what a problem?

I don't know. It seems that my serial ports are being detected during
boot, but when I start X Windows I can't move the pointer. I have tried
/dev/tty00 and /dev/tty01 as my mouse device, but both wouldn't work. I
couldn't find any information about serial mice at the netbsd webpage
and in the manual pages.