Sunthiti Patchararungruang wrote: > Wow!! That's a terible thing. With a PIC, you cannot use extenal > program memory (except in PIC17 family) and you cannot write a program > longer than its specific program-area size (1K in 16C84). > > Sunthiti Patchararungruang Sorry, that isn't correct.You can (theoretically) write your own operating system, which can use external Memory, but it would slow down performance dramatically. dorian