Apparently, unbeknownst to me, the floppy driver is broken on the Magnum.
I tried mounting a local root filesystem and got nothing but driver errors.
So I've disabled the floppy driver, and the scsi driver just incase.
Same results.  Processes just don't seem to be able to fork from init.
I even stuck a printf at the beginning of main in init, and it never got
printed.  Maybe 1 in 20 or 30 reboots, I actually get the hit return for
shell prompt, and init actually forks sh, which runs tset, and tset hangs.
I can only think of two things:
Either the sonic ethernet driver is broken in some way (unlikely, since it
worked fine before on the pica and olivetti), or some sort of memory corruption
is at work in the creation of the process context for either pid 0 or pid 1.
I may be able to get my hands on a spare scsi zip drive and try booting off
local disk to rule out a sonic driver problem.
But I would really appreciate if Magnum owners would try my kernel and give
me some feedback!  I have it sitting at:
ftp://ftp.radicalmedia.com/incoming/netbsd

Cheers,
-Mark