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Scott Adams published the BASIC source code to Pirate Adventure in the December 1980 issue of BYTE Magazine (pp. 192-212); the code sets up the virtual machine for the adventure and then largely consists of DATA-statements, thousands of numbers plugging values into the virtual machine. With this (somewhat obtuse) reference, many text adventure fans among BYTE's subscription base reverse-engineered the virtual machine and used it to help get a leg up advancing their own homebrew text adventures.
Scans of the pages in question can be viewed online at http://www.biggusgeekus.org/if/byte1280.html