I know its only 'bout the consoles, but lets mention other systems too :)
Computers
1989-1995 - Atari 800 XE - still working
1990-1995 - ZX Spectrum / Didaktik Kompakt (it was ZX Spectrum with floppy drive - created in Slovakia) - only at friends houses or rented
1994-present - all the PCs (from PC286, 386, 486, 586, 200 MMX, as today on CoreI3 laptop) - looking for building up an CoreI7 desktop machine :P
2004-2004 - Atari ST1040FM - still working
GameAndWatch
1987-1995 - Wolf and Eggs - still working
1987-1995 - Octopus - someone stoled it :(
1992-1992 - Parachutes - sold it
1992-1992 - Frogs - sold it
1992-1993 - Shogun (we named it like that :D) - only rented from friend
1993-1994 - Defend the bridge (we name it like that :D) - sold it
1994-1996 - Telstar Submarine (a clone ???) - still working :)
Consoles:
1994-1997 - NES Clone (something with BELLGAME in name) - at friend house
1997-3days - SNES - just played it - at friend house
2005 - 2007 - N64 - sometimes rented from friend
1997-2002 - PS1 FAT - laser problem - problems with ports
2006-2010 - PS2 FAT - still working (with HDD) - now on sale :)
2007-2010 - Sega Dreamcast - with keyboard, mouse , 4 gamepad, 4 VMU, 4 rumbles :) and 40 games :) - still working :)
2008-present - XBOX - still working - now used as XBMC :)
2008-2008 - PS1 Slim - still working (also have it with the LCD :) )
2009-present - XBOX360 - primary console :)
2009-present - Wii - 2nd primary console :)
2011-present - PS3 - now rented to someone :)
Portable:
2007-2008 - GameBoy Color - still working
2008-present - PSP FAT - still working
2009-present - PSP Slim - still working
2007-2008 - Gameboy Advanced - still working
2009-present - Nintendo DS Lite - still working :)
Well, some years could be other (+/-). But this is how it was :)
The more I read the "console flamewars", the more i love my dreamcast :D
Proud owner of: Dreamcast, PSP, PSOne, PS2Slim, Xbox, Xbox360, Nintendo DSLite, GB color, GB Advanced, Nintendo Wii