Atari was formed in 1972, originally producing the coin-op Pong
and came to an end as a hardware company in 1996.
They released the Atari VCS (aka Atari 2600) in 1977,
Atari 400 and 800 8-bit computers in 1979,
Atari 5200 SuperSystem (based on the 8-bit computers) in 1982
and the Atari 7800 ProSystem in June 1986.
It was actually ready in 1984 but Atari changed ownership that year
and it's release was shelved
This collection has been gathered after many hours of trawling the internet
and a lot of help from the Folks at the AtariAge forums.
I guess a picture of a real cartridge confirms it's existance!
Thanks to the following great sites in particular:
Puisoft Cart Collection
Atari 8-Bit Forever
Cartridge Dumping Project
Andrew Kriegs' List (v5.9)
If you have any missing bins or pictures to help complete the list please email me.