Nice! Sadly my parents sold ours when I was still quite young and I haven't tried one after that. Still have fond memories of it though. We only had a handful of games, hmm let me see if I remember some of them...
Armoured Assault was fun, top down view, you drove around with two tanks and tried to destroy each others fort.
Spectron was a space invaders clone, quite okay.
Ninja was fun too, a platformer, it's hard to compare it to something else but I had fun with it.
And Sasa! It was awesome! You were flying around with some kind of jetpack guy and moved yourself by shooting a heavy weapon which recoil moved you in the opposite direction. Very original.
I remember Tetra too, it was cool, hard to describe though but I remember it being a bit scary when I was young, cobra snakes and skulls were chasing you.
Fun times anyway. My first computer.