Sony:

PS1 x6
PS2 x4
PS3 x4
PSP x6
PSVita

Nintendo:

NES
SNES x3
N64 x3
Gamecube x4
Wii x2
Wii U
Gameboy
Gameboy Color
DS x8
3DS x2

SEGA:

Master System
Genesis
Saturn
Dreamcast x3

Xbox one x2
Xbox 360 x5

Since you're counting physical systems

Nintendo: NES, SNES, N64, GCN, Wii, Gameboy fat, Gameboy Pocket, GBC, GBA, GBA SP, DS
Sony: PS1, PS2 fat, PS2 slim, PS3, PSP
Sega: Genesis, CD, Dreamcast
X-Box: 360 (x4, but I only physically have 1, the rest were replaced under warrenty)

20

But to be fair, that will be 25 by the end of next year because I plan on buying a 3DS XL, WiiU, another PS3, Virtual Boy (I already have the games I want for it), and a Sega Saturn.

You win.....do you also play frisbee with playstation units, or wth?

As a die hard nintendo fan, I only have nintendo consoles and handhelds:

NES, N64, Game cube, Wii, Wii U
Game boy, GB color, GB Advance, Nintendo DS, DS lite, 3DS

I have a N64, GBC, PS2, GBA SP, DS Lite, Wii, and Wii U.

PS3/PS2/PSVita/3DS XL/n64/Wii/PSOne/DS Lite/PS3

Atari:

2600 woodie
2600 vader
2600 junior
7800
Lynx
Lynx 2
Jaguar

Nintendo:

NES PAL A
NES PAL B
NES NTSC
SNES PAL
SNES NTSC
Super Famicom
N64 PAL
N64 NTSC
Gamecube PAL
Gamecube NTSC
Wii PAL
Gameboy (multiple)
Gameboy play it loud (multiple colors)
Gameboy Light (multiple colors)
Gameboy Pocket (multiple colors)
Gameboy Color (multiple colors)
Gameboy Advance (multiple colors)
Gameboy Advance SP (multiple colors)
Gameboy Micro
Gameboy Advance SP brighter screen
DS
DS lite
Dsi (multiple colors)
DSi XL
3DS
3DS XL (multiple colors)

M82 demo unit

Sega

Master system
Master System II
Mega Drive PAL
Genesis
Mega Drive II
Genesis 2
Game Gear PAL (multiple)
Game Gear NTSC
Saturn PAL
Saturn NTSC
Saturn NTSC-J
Dreamcast Pal

SONY:

Playstation PAL (multiple)
Playstation One PAL (multiple)
Playstation 2 PAL (multiple)
Playstation 2 NTSC
Playstation 2 slim PAL
Playstation 3 PAL (phat 60 GB)
PSP - 1004 (multiple)
PSP - 2004
PS Vita (wi fi / 3G)

Microsoft:

Xbox
Xbox 360 Arcade
Xbox 360 Slim - Star Wars

Others:

Watara Supervision
Supervision (variant)
Wonderswan
Wondeswan Color
Wondeswan Crystal
GP32
GP2x F100
Tapwave Zodiac 100
N-gage
N-gage QD
Tele-game spiele Palladium
Turbo Grafx 16 (PAL)
Neo Geo Pocket
Neo Geo Pocket Color
Super Engine II (Turbo Grafx 16 - Czech republic clone version)

Later edit: forgot about:

Virtual Boy

Dingoo A320

PSP GO Pal

and about 4000 games to play :)

Consoles: NES, SNES, PS1, N64, PS2, GC, DC, Wii, PS3, Wii U
Handhelds: GBA SP, GBA Micro, DS, DSXL, 3DS

You don't have a Vectrex.

Tu esti?