In a message dated 12/21/98 20:04:24 Eastern Standard Time, jaymzroo@juno.com writes: > I believe that its every 40th byte. you add those up and store them into > the checksum byte which is the byte right before the 200 byte area for > the program. then set the corresponding flag > actually, it goes right before the first byte. and it's the total of bytes 1, 40, 80, 120, 160, and 200