| Atari 400/800 cart. |  DT-80: Eighty Column Dumb Terminal for the ATR-8000 | 1984 | ACE Amiable Computer Enhancements |
| Atari 400/800 cart. | ACE-80XL | 1985 | ACE Amiable Computer Enhancements |
| Atari 400/800 cart. | The Learning Phone Model RX8080 | 1985 | Atari Corp. CA, USA |
| Atari 400/800 cart. | Test Atari 65-130XE | 1986 | Atari Corp. CA, USA |
| Atari 400/800 cart. | Atari LOGO Model RX8032 | 1983 | Atari PECF Creteil, France |
| Atari 400/800 cart. | AtariTexte Model RXF 8036 K | 1984 | Atari PECF Creteil, France |
| Atari 400/800 cart. | AST - Atari Super Turbo for Atari 1010 | 1988 | Atari Studio |
| Atari 400/800 cart. | AST - Atari Super Turbo for Atari XC12 | 1988 | Atari Studio |
| Atari 400/800 cart. | 400/800 SALT Diagnostic Cartridge Model TE15644 | 1979 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Atari BASIC Programming Language Model CXL4002 | 1979 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Editor Assembler Computing Language | 1979 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Educational System Master Cartridge Model CXL4001 | 1979 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | In-Store Demonstration | 1979 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Music Composer Model CXL4007 | 1979 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Assembler Editor Computing Language Model CXL4003 | 1980 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Pilot Computing Language | 1980 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Assembler Editor Computing Language Model RXG4003 | 1981 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Telelink I | 1981 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | 810 Diagnostic Cartridge Model FD100006 | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | AtariSchreiber Model RXG8036 | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | AtariWriter Model RX8084 | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Microsoft BASIC II Programming Language | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Paddle Jitter Test | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Telelink II | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | 1400 Super SALT Diagnostic Cartridge | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | 1400 Telecommunicator Model RX8050 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | 600xl/800xl SALT Diagnostic Cartridge | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Atari LOGO Model RX8032 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | AtariArtist Model RX8053 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Atarilab Temperature Module Model AED80013 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | CPS Super SALT 400/800/XL Diagnostic Model FD100335 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | AtariGraphics Model RX8054 | 1984 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Atarilab Light Module Model AED80014 | 1984 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | PLATO | 1984 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Pocket Modem Software | 1984 | BOT Engineering |
| Atari 400/800 cart. | Target Electronic Banking | 1986 | COVIDEA |
| Atari 400/800 cart. | Info/Gen | 1984 | Cable Graphics Sciences |
| Atari 400/800 cart. | MicroIllustrator | 1983 | Chalkboard, Inc. |
| Atari 400/800 cart. | MicroMaestro | 1983 | Chalkboard, Inc. |
| Atari 400/800 cart. | Homebase Electronic Banking | 1982 | Citibank |
