Hi Andrew. That was Scott Dattalo and his "find a 6 clock vertical adder" brute force algorithm. WBR Dmitry. > P.S. At least one person has already written a "try all > possible combinations of x instructions" program for writing PIC > code. I believe he's on the list; perhaps he'll respond to this > thread. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.