modernizing npx(4)

[David Young <dyoung%pobox.com@localhost>]

It is my understanding that since we do not support the 80386 any more,
there is no need to support npx at irq 13, since every x86 processor
since the 80486 is capable of reporting FP errors by using exception 16.

Is it ok if I get rid of the vestiges of irq 13 handling, and move npx0
from isa0 to mainbus0?  Let me know.

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933 ext 24