alright, this can go to faq@ticalc.org when it's answered. . . when I do this cp 6 does the processor do this a-6 or this 6-a I need to know this because it sets the carry flags. . . if a was 5,a-6 would set the carry flag, however 6-a wouldn't, Jimmy Mordel's zshell school says it is the first way, but his table says it the second way. so if you could please help it would be great. Gerad