I used to have the Intellivision back in the day I never played any roms for it.

Some decent games which were really something back then:

Sub Hunt
Deadly Disks of Tron
Burgertime
Night Stalker

There was a He-man game for it, I'll bet it's pretty crap but I'd still like to try it just because I could.

This was a 1984-1986 machine IIRC

I used to play Atari back before that but I don't remember much just that 2 player VS Airplane game and pong.

Everything since the NES I emulated and esp MAME games, I haven't played a console in 2/3 years maybe even bought budget PS1 games so I could play them on my PC.

Oh yeah and saturn but only because I couldn't be bothered with getting the emu working probably not ghettoware friendly anyway.

Also those little Nintendo hand helds like Donkey Kong Junior and erm I forgot the otherone? Something with a little guy and bases and Maybe the TMNT Konami hand held.

Play Gain Ground.