As I understand it the 16C84 and 16F84 are essentially the same chip, but I have not had much success using 16C84 code directly on a 16F84. Can someone please answer the following questions.. 1) What are the differences? 2) Can a program written for 16C84 be used *EXACTLY* as is for the 16F84, including assembler instructions and memory address references? 3) If answer to #2 is *NO* what modifications are necessary. THANKS! -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Confucius says Support bacteria - it is the only culture some people have! <>< ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~