While waiting for coffee to brew, I decided to post a question that pops in my head every time I scrutinize the .err file trying to track bugs. Anyone willing to offer an opinion on the OPTION instruction? Here's what the Microchip (16c7x) data sheet says: "This instruction is supported for code compatibility with PIC16C5X products." "To maintain upward compatibility with future PIC16CXX products, do not use this instruction." OK, I don't see this as being very clear. Does this mean: --I learned PIC coding with 16C5X products, it's OK for me to use it.-- or maybe it means: --It works on the 16C74A you have in your hand, but a 16C74A you buy tomorrow may not support the OPTION instruction.-- or perhaps: --The PIC16C7X series will always support it, but some new line of parts will not include it.-- Cheers, Bob