Year 93 is a guess, because I first remember Steve Cullen at State Farm installing TSO in the fall of 1972; at the time, we were still using PanValet to update programs thru card decks, and I needed to change 150 lines in a simulation program (SAM) we were using (to ultimately decide to buy 25 IBM 370/158s), which would have required 300 cards to make the changes. Wow, was CHANGE 'xxx' 'yyy' ALL a brilliant alternative.
