My list is fiarly hefty.

Atari 2600 was first
Owned a Coleco for a while
Intellivision 1
I owned a Odyssey 2 at some point, but I might of got it before Intellivison (Wish I still had one too)
Owned an Astrocade I remember, but don't remember it much
Atari 7800
Nintendo 8 bit
Turbographix-16
Sega Genesis
Super Nintendo
Original B&W Game Boy (wish I still had one of these too)
32X ()
TurboDuo ( - such a waste, bought TWO games for it was all)
Atari Lynx (best handheld system there was back then)
Atari Jaguar (which I turned around and sold in less than 48 hours thankfully)
PS1
Saturn
N64
PS2
Gamecube
X-Box
Game Boy Advance

Skipped a few along the way such as Sega CD, Master System, Game Boy color and a few old systems like the 5200, but I'm prety sure I've played stuff of all of them at least twice. Would love to find an Odyssey 1 or 2, probably worth big cash (Especially a 1, if any even exist)