Mik Juneau Kim wrote: > I am designing a system that needs each PIC to have unique codes > (32 bits). .... Since there will be several thousand of these guys, > burning each one with different code is not an option. Of course it's an option. Microchip's PROMATE programmer (and maybe their PICSTART Plus, as well) can be configured to do exactly what you want; all you have to do is put a 4-byte lookup table in your source code and tell the programmer where it is... Each PIC will be programmed with a unique set of values in that lookup table. -Andy === Andrew Warren - fastfwd@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499