On Feb 13, 2008, at 12:08 PM, Andre Abelian wrote:

> Almost any pin can be made to behave like an open collector by  
> switching a pin between input and output, but the maximum voltages  
> are limited by the micros supply rail, unlike a true open collector/ 
> drain pin.

I didn't think that "open collector" implied high voltage capability,  
though I guess I can see how it might be interpreted that way.

Huh.  I never noticed that the PICs RA4 had that sort of capability.   
Is 8.5V actually USEFUL in that regard?

BillW

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