I think I posted here years ago but a lot has changed.
Nintendo:
NES
Super Nintendo (model 1) w/Super Game Boy
Nintendo 64
Gamecube w/Game Boy Player
Wii (two of them)
Wii U 32 GB
Game Boy
Game Boy Pocket
Game Boy Light
Game Boy Color w/frontlight mod
Game Boy Advance
Game Boy Advance SP MK 1
Game Boy micro
Nintendo DS
Nintendo DS Lite
Nintendo DSi
Nintendo 3DS
Pokemon Mini
Virtual Boy
Game and Watch Ball
SEGA:
Master System (model 1)
Genesis (model 1 and 2)
SEGA CD (model 2)
SEGA 32X
Saturn
Dreamcast
Game Gear
Nomad
SNK:
Neo Geo MVS 1 slot w/UNIBIOS
Neo Geo CD toploader
Neo Geo Pocket Color w/frontlight mod
Sony:
Playstation (both major models)
Playstation 2 (fatty)
Playstation 3 80 GB (no b/c)
PSP 2000, 3000
Playstation Vita OLED version
Atari:
2600 4 switch woody
5200 4 port
7800
Jaguar
Jaguar CD
Lynx II
XEGS
Flashback 2.0, Flashback 2+
Other companies:
Xbox
Xbox 360 S (4 GB model w/ the HDD from my dead 20 GB Jasper)
3DO (Goldstar model, unfortunately)
Colecovision
Intellivision
Magnavox Odyssey[sup]2[/sup]
Vectrex
Hyperscan
CD-i (a portable LG model)
Turbografx-16
TuboExpress
Nokia N-Gage QD
Bandai Wonderswan
Bandai Wonderswan Color (one brand new orange, one pink with frontlight mod)
Plus some various shitty Chinese clones and knockoffs I never use. MiWi, Game King, famiclones, etc. And of course the gaming PC, the phone, the tablet, stuff like that.
Also had a GP2X F100 but I'm fairly sure it was stolen. Or I just have too much shit and can't find the fucker.
The last machines I want to add to my collection are a PC Engine Duo-RX, possibly a Commodore 64 (but it seems like a lot of hassle), a SEGA SG-1000, and maybe something oddball like a CD32 or Marty or Astrocade.