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I have to admit to being awfully confused by this article. In about 30 seconds of web searching I found several open source implementations of very traditional BASIC. Here, for example, is the home page for Chipmunk Basic, which seems to be just what the author is looking for:
http://www.nicholson.com/rhn/basic/
and as the bottom of this page shows, there are literally dozens of other basic and basic-like languages available for free for nearly so.
So what am I missing?