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S.D.I. is an abbreviation for "Strategic Defense Initiative".

Contributed by tarmo888 (5380) on Nov 11, 2006. -- edit trivia

Commodore 64 and Apple IIGS ports of SDI were planed but were never released.

Contributed by Ricky Derocher (22652) on May 19, 2006. -- edit trivia

On September 23, 1987, S.D.I. was put on the infamous German index by the BPjS. For more information about what this means and to see a list of games sharing the same fate, take a look here: BPjS/BPjM indexed games.

Contributed by Xoleras (66540) on Dec 11, 2005. -- edit trivia

The manual for the game has a nice section at the end that describes many "wars in space" movies if the reader wants to pursue the genre further. Some of the movies mentioned range from the "Flash Gordon" serials and "Radar Men from the Moon" to the "Star Wars" and "Star Trek" series.

Contributed by Trixter (9110) on Jan 11, 2000. -- edit trivia