Is there a valid memory address (ie, within the range usable by the address bus) that is never used, such as 0? Thanks, Jordan Bettis. "Probably the best operating system in the world is the [operating system] made for the PDP-11 by Bell Laboratories." - Ted Nelson, October 1977 - To unsubscribe, send email to majordomo@luci.org with "unsubscribe luci-discuss" in the body.