From 1983. I remember reading this book obsessively as I tried to develop my own versions of Zork . I was in middle school learning how to write a language parser. Nerd!
470 N=1 480 IF MID$(A$,N,1)=" " THEN C$=MID$(A$,N+1,3): IF LEFT$(C$,1)<>" " THEN 530 ELSE 500
I'm Andy Wibbels. I'm the author of 
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Jason says to tell you his weapon of choice has always been:
http://www.adventureconstructionset.com/Webs/ACS/default.asp
Er….being a third party commenter I erred. It was Wargame Construction Set, here:
http://www.c64sets.com/wargame_construction_set.html
(um, neener?)
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