It was overshadowed by the Nintendo anniversaries during the past week, but this week also held the silver anniversary of the Sega Master System. A little more than two years before Phantasy Star appeared, Sega released their second home gaming console under the name "Mark III" on October 20, 1985. The following year, the system was renamed to the more familiar "Master System" for release outside of Japan.
You can read some history of the Mark III/Master System on Wiki:
http://en.wikipedia.org/wiki/Master_system
A belated happy birthday to the Master System! for everyone!