Welcome to the big 'Which consoles do you have and how many games for it' research (it was too long for the subject). I have no idea if somebody did this in the past. Probably something like it, but list the consoles that you own and behind it the number of games you have for it.

I'll start with it

NES (3x, and some clones) (387 games)
Sega Mega Drive I & II (147 games)
SNES (PAL) (87 games)
Sega Master System II (28 games)
Game Boy (24 games)
Sega Mega CD II (22 games)
Philips CD-I (17 CD-I's, not all are games)
N64 (15 games)
Atari Jaguar (9 games)
Sega Game Gear (6 games)
Atari 2600 (3 games)