> I've limited myself to the 16F628, since (I believe) that's
> been tested.

I have tested a lot more chips, but that one certainly!

> I'm programming the PIC out of circuit.

Do you have a /MCLR pull up (33k)? Some decoupling on the power?

> The fact that it works intermittently tends to tell me that
> the hardware
> *should* be okay, and there is no issue with the ports, but
> it could be a
> timing issue... ?  Someone mentioned that their Wisp is sensitive to
> undervoltage, and needs 5.0V - 5.5V.  Perhaps my 5.03V is a problem?

5.03 V is OK, provided that it is not an average of a ripple. that is
works intermittently most probably means that there is some hardware
problem, for instance a solder joint that does not make contant (but
does couple capacitively!).

> are those the latest, or is there a later version that hasn't
> made it there yet?

I have a newer version, can send it if you want, but it should
definitely not be needed for a 16F628.

> Is there a way to set it up for slower (safer) timing so I
> can verify?

There is, but IO never documented it. Again, I doubt that is the real
issue.

> Is
> there a way to exercise each output/input line so I can test
> individually?

No



If you could give me the *exact* hardware setup you use, maybe include a
picture, I could try to reproduce the problem.


Wouter van Ooijen

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