Well, what I am hearing is that my own method of debugging the chip is
about as good as it gets for us hobbyists. :-)

In order to not have any particular suspense, let me say what the problem
was:  I had a jumper wire (attached to a button) which was broken in the
middle.   Someone had decided to cut it (me?) , then changed their
mind.  So it didn't show.  But when you push it one way, it connects.  Push
it the other way, no connection.  :-(

Solved it by putting LED breakpoints in.  "I got here.  I didn't get
here."  Narrowing it down.  Very primitive debugging.  But it worked.  I
thought there might be some more sophisticated methods.  But there does not
seem to be.  I am very appreciative of all the replies.

Ciao,
John

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