Lyndon, Let us know if you find that source as it unfortunately doesn't appear to be on netlib.org. P.S. Yes I know there are a million other APLs out there, as well as J and the assorted follow-ons. It's the V7 code I'm specifically interested in. Maybe it's tucked away in the bitsaver archives ... ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T476a1d7b83269775-M6239b6398c03cb109c7623d7 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription