>We are stopping development immediately using the 16C84 unit!
>
>Does anyone know of any other PICs that are MUCH more secure???

        Well, if you've been following the discussion you know
        what various people would say about "MUCH more secure!!!"

        In any case, the security hole with the 'C84 is strongly
        related to its use of EEPROM code memory.  So as a *general*
        statement the EPROM PIC's don't suffer this problem.

        You will probably find that a 16C61 + 24LC01 is actually
        cheaper than a 16C84 (but takes more pcb space and costs
        two I/O lines).

___Bob