> Is it possible to make a very simple circuit to program EVERY 16F 
> and
> 18F pics using ICSP ?

No. Some processors do not support ISP.
For those that do the circuitry is usually very simple BUT the 
programming algorithms vary between chips, and keeping up with them is 
a major task. Part of paying for a well supported professional 
programmer includes having THEM keep up with the algorithms.



        RM 

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