David Blain <dblain@MEDIAONE.NET> asked about in-circuit-programming of
Scenix SX parts when using an oscillator module:

> Well, you convinced me.  I am going to abandon the attempt to make the
> switching automatic and just go with a good quality dip switch.  I will just
> have to label the switches well, so that I don't blow out the oscillator.  I
> am sure I will remember after I let the smoke out of a few. :-)

What some people have reported to work is putting a capacitor in series
with the oscillator output, so it doesn't see 12V DC during programming.
I'm not sure what an appropriate capacitance is.

That doesn't help you select *which* SX on your board to program, but it at
least keeps the oscillator from having conniptions.  Hmmm...  Maybe if you
wired the oscillator output through *two* capacitors to the two SX parts, you
could put separate programming headers for the parts.