> > I run my 380 clocked at 33MHz.  That's what my 040 is rated at and I never
> 
> Can you do this because you added something or can typical 380 boxes be
> swiched to 33Mhz just with a different jumper setting?

A typical 380 can be made to run at 33MHz.  Just change the oscillator.
The oscillator frequency is twice the CPU clock rate.  So pull the 50MHz
oscillator and put a 66MHz one in.  QED.

Now with that said, if your 040 isn't rated to 33MHz, then you run a risk
OF DESTROYING IT!  The faster it runs, the hotter it gets and eventually it
will burn up.  But Motorola builds beefy chips.  Chances are good that you
can run a 25MHz part at 33MHz.  But you'll definitely need a good heat sink
and use plenty of heat sink goop.  Buy a heat sink with the clamping
mechanism that fits under and over the chip.  (You have to pull the 040 to
install it, and that's no small task as they are very tight in the socket.)
And even then, it's a risk.  If you leave the machine on all the time in a
hot room with poor ventilation, then this is definitely a bad idea.  Even
in a cool machine room, you will be taxing the poor chip beyond it's rating
and it may die prematurely.  'Nuff said.

> What about HP apollo 400 series? HP-UX says with 'uname -m' that
> it is a '9000/43T'. Under NetBSD it is a 380.

Don't know.

> Where are, if there are, the jumpers or dip-switches located?

The oscillator is right next to the 040.  It's the silver, rectangular
metal can with four leads.  There is also a jumper marked "33" and "25"
that is right next to the 040 as well.  It adds in a memory wait state when
set to "33".  I suggest leaving it at "25" unless you are getting memory
errors or spurious crashes.

Dave