NES
Genesis
SNES
Dreamcast
PS2
GameCube
Wii
Wii U
Game Boy (original)
DS Lite

I have all 3 so i cant poll

Super Nintendo
Nintendo 64
PS1
Gamecube
3 Wii
2 Nintendo DS
2 PS3
PS4

Wii, PSP, Nintendo DS

NES - with ROB
Sega Master System
Gameboy
SNES
One of the Sega portables I don't even remember which
N64
Play Station
Gamecube
PS2 Slim- although this is on it's last legs takes 2 to 3 minutes just to load a disk
Wii
PS3 Slim
X360
3DS XL -LOZ edition
Wii U

My Atari 2600  and games sadly are somewhere in my Dad's attic ...

Ps2
Ps3
Ps4
Xbox 360
Wii u
Psp
Psvita
3ds

Nintendo:
Wii U
3DS (normal & XL)
Wii
DS lite
Gamecube
GBA (original & SP)
N64

Sony:
Playstation 4
Playstation 3
Playstation 2
PS Vita
PSP (2000/3000/Go)

Microsoft:
Xbox One
Xbox 360

Sega:
Dreamcast

I'm only gonna list the ones I currently use. Wii u, Xbox one, 3ds. Also I always have my GameCube hooked up.

NES (original & top-loader)
Gameboy (original brick & pocket)
SNES
Gameboy Advance SP
N64
Wii
Genesis (Model 2)
Dreamcast
Xbox (OG)
PS1
PS2 (original & slim)
PS3 (60 GB fat & 500 GB slim)
PS4

Next system is either gonna be a PC or Vita. Current systems hooked up is PS2, PS3, PS4, SNES & Wii.

N64, Gamecube, Wii, Wii U, GB Advance, DS, 3DS, Xbox, Xbox 360, PS1, PS2, PS3, PSP, Genesis.  I think that's all of them.