Though I love 'em all I only have four (mostly because my bro sold most of em to buy newer systems... HERESY!). unforunately, we both paid half for almost every system, so it was hard to tell where the ownership was. my bro took most of em in the end. whatever, Ill find systems and games that i love so i know its not going to be a problem.
anywho, the systems I own are the Nintendo Entertainment System/Famicom and the Sega Genesis. I have a Super Nintendo, but it is dead. but I have a Game Boy + Advance and a Sega Game Gear.
Cartridge systems, Nintendo 64, SNES, Gameboy Color..and a gameboy..somewhere..I lent it to my friend so he could play pokemon back how he used to..big mistake.
If we're talking altogether, those along with a Gamecube, Xbox 360 Elite, PS2, PSOne, Dreamcast, and PSP.