4.7. I have a PS/2 mouse (``keyboard'' mouse) (Alternatively: I have a laptop with a track-ball mouse). How do I use it?

You'll have to add the following lines to your kernel configuration file and recompile:

device    psm0    at isa? port "IO_KBD" conflicts tty irq 12 vector psmintr
# Options for psm:
options   PSM_NO_RESET       #don't reset mouse hardware (some laptops)