Why, that's be the ol' TI-99/4A, sporting such classics as Hunt The Wumpus, Jungle Hunt, and, of course Tunnels of Doom, whose sizable data exceeded the simple confines of the solid-state software game module (the cartridge) to a more expansive media: the audio cassette tape!
Now, true glory is playing Tunnels of Doom on an LCD projector for true marriage of past and present technologies. That, and pixels the size of your fist.
The oldest is a Sinclair ZX81 which I was looking at the other day in the loft as we were getting our suit cases down (which is why the name came to me so quickly) And I'm sure we still have a Commodore 64 as well but don't ask me where it is, I just remember it from my childhood days. We also had something which I never found out what was, it may have been the Sinclair but I can't remember whether or not it was. It was a loose cartridge based system which I only remember a tooth decay game. That's all I know though.
We did have an Atari 2600 but it was *thrown* away because it was broken. It was as useful as a block of wood. But I do own practically own all the successful consoles from the 3rd-Gen upwards from the NES, SNES, Sega Master System II, Mega-Drive, Sega Mega CD (found it at a car boot sale, selling for a £5 with 5 games) Nintendo 64, Saturn, Dreamcast, Gamecube, PS2, PS3 and Wii. Don't own any of the Xbox's yet but will be getting a 360 just to play Overlord!
Oh and if we're looking at handhelds, I own a Gameboy, Game Gear, Gameboy Pocket, Colour and a DS.
In totals I own the lot. cept Commodore 64, Master System, Snes, Saturn, Sega CD, Neo Geo, PS2 and PSP. It's a bit of a moot wish but it would have been great if the TG16 was launched in Europe. The games feel like more graphically polished and worse sounding Amiga stuff.