Renzo wrote:
> I have a circuit, mainly a counter, with Led display driven by a 
> 16F84a that runs perfectly.
> I changed the chip with a 16F628A , no change in the circuit I only 
> replaced in the program the RAM beginning with 20h instead of 0Ch and 
> of course processor and include file..
> Now to start I have to momentary ground Rb0 and Rb4 never change.
>
> There are any other replacement to do? There is some article that 
> deal with this problem?
> Thanks
> Renzo Giurini
>
>   
There are a few other changes, too. Look at the Microchip Spec sheet for 
the PIC16F628A.
At the very least, CMCON will have to be loaded with 7 to turn off the 
analog comparators,
and enable digital signal operation.

--Bob
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