SDI stands for "Strategic Defense Initiative", which was the name of a proposal formulated in 1983 by former U.S. president Ronald Reagan to use ground- and space-based systems to protect the U.S. from nuclear missile attacks. The game is based on the SDI premise, which came to be more popularly known as the "Star Wars" programme.
Conversion Notes
PC versions: CGA
N.B. Despite being advertised, C64 and Apple IIGS/Macintosh versions were never released.
When you’re in the Russian space station, pick one man and keep firing at him 10 or 15 times. No other men will appear and you can keep doing it until you get the girl.