Sega Ages 2500 Series Vol. 21: SDI & Quartet: Sega System 16 Collection
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(SEGA AGES 2500シリーズ Vol.21 SDI & カルテット ～SEGA SYSTEM 16 COLLECTION～) is the twenty-first entry in the Sega Ages 2500
series for the PlayStation 2
As the name suggets, SDI & Quartet: Sega System 16 Collection is a compilation which includes the Sega System 16 and Sega Master System (both Japan and worldwide) versions of SDI: Strategic Defense Initiative and Quartet. In the case of SDI, this marks the first time the game has been brought to the home with the correct dual-joystick control scheme.