Yay for Master System! Had the original MS1, with the cool schematics on the top and the gamecard port.
Back then, it was a pretty popular system in Europe. There was almost one kid with a SMS for every 2 kids with a NES.
Also, no pause button on the controllers. People actually had to get up, walk across the room and reach the pause button on top of the system!
I remember playing games like Golden Axe Warrior, Castle of Illusion, Alex Kid, Wonderboy in Monsterland, Hang On, Asterix, Fantasy Zone and Phantasy Star.
I'd like to point out that Sonic 1 and 2 were pretty awesome on that system.
Though my all time favorite remains Wonderboy III - The Dragon's Trap, which also has one of my favorite 8bit-era soudtrack.