Atari:
Atari 2600 (6 switch and 4 switch)
Atari 5200 (2 port)
Atari 7800
Atari Jaguar
Atari Jaguar CD
Atari Lynx
Nintendo:
Nintendo Famicom (Red model, round buttons)
Nintendo Entertainment System (Toaster and two top loaders)
Nintendo Super Famicom (original model, not junior)
Super Nintendo Entertainment system (3 original models, one junior)
Nintendo 64 (three stock systems)
Nintendo Game Cube (two black systems)
Nintendo Wii
Nintendo Wii U
Nintendo GameBoy (one Gray, one Green)
Nintendo Virtual Boy (3)
Nintendo Game Boy Pocket (black)
Nintendo GameBoy Color (clear purple)
Nintendo Game Boy Advance (one regular model, one SP, one micro)
Nintendo DS (original model)
Yobo Neo-Famicom clone
Power Joy Famiclone
Retro Mini-X II Portable Famiclone
Nintendo 3DS
Sega:
Sega Master System
Sega Genesis (two model 1s, model 2, 2 model 3s)
Sega Game Gear (one blue, one Sega black, one Majesco black)
sega CD (one model 1, one model 2)
Sega CDX
Sega 32X
Sega Pico
Sega Saturn (6 one Japanese unit model 1, one US model 1, 4 US model 2s)
Sega Dreamcast (four, one Asian, three US)
JVC X-Eye (2)
Sony:
Sony Playstation (two original models, one PSone)
Sony Playstation 2 (one original model, one slim)
Sony PSP (one 1000 one 3000)
Sony PSP-GO
Microsoft:
Microsoft Xbox (2)
Microsoft Xbox 360 (original model with HDMI)
SNK:
Neo-Geo AES
Neo-Geo Pocket (Black and White)
Neo-Geo Pocket Color (multiple)
NEC:
SuperGrafx
TurboGrafx 16 + CD-ROM
Turbo Express(2)
TurboDuo (2)
TurboGrafx (PAL version)
Others:
Colecovision
Magnavox Odyssey 2
Mattell Intellivision
Mattell Hyperscan
Tiger Game.com
Tiger R-zone
Nokia Ngage QD
Panasonic 3DO (2 FZ-1 and FZ-10)
Goldstar 3DO
Phillips CD-I
Pioneer Laseractive with US Sega Module and JP NEC module
Samsung Nuon N-501
Wonderswan
Wonderswan Color
Game Wave
Watara Supervision
Gizmondo
Home Pong/Standalone
Magnavox Odyssey 2000
APV TV Fun
Unknown Brand Home Pong clone
Sears Home Pong
Added in edit: Updated