| Game Name | System |
|---|
| Agent_CIO | Atari 800 |
| Agonia | Atari 800 |
| Air Attack (19xx)(Scott Sheck)[a][bas2boot] | Atari 800 |
| Air Battle (1981)(J. H. Palevich)[Req OSb] | Atari 800 |
| Air Combat (19xx)(-)[Req OSb][k-file] | Atari 800 |
| Air Hockey (1984)(Chris Page)[k-file] | Atari 800 |
| Air Raid 2000 | Atari 800 |
| Air Raid 2000 (19xx)(-)[BASIC] | Atari 800 |
| Air Rescue (1991)(Atlantis Software)[cr Mr. Bacardi] | Atari 800 |
| Air Strike (1982)(English) | Atari 800 |
| Air Strike II (1983)(English) | Atari 800 |
| Air Support (1984)(Synapse)[k-file] | Atari 800 |
| Air Traffic Controller (1981)(David Mannering)[k-file] | Atari 800 |
| Air-Raid (1982)(APX) | Atari 800 |
| Air_Ball | Atari 800 |
| Air_Defense_Compute! | Atari 800 |
| Air_Rescue_I | Atari 800 |
| Airball | Atari 800 |
| Airline | Atari 800 |
| Airline_Adventure_International | Atari 800 |
| Airwolf (1985)(Elite)[cr Kilroy] | Atari 800 |
| Akanis Ula | Atari 800 |
| Akce Klement | Atari 800 |
| Akce Klement II | Atari 800 |
| Akcie a tovarny | Atari 800 |
| Aladin | Atari 800 |
| Alchemia (1983)(Mirage)(pl)[k-file] | Atari 800 |
| Alex - Robbo 3 (1992)(Robo-Soft) | Atari 800 |
| Alexandr Makedonsky | Atari 800 |
| Alf_in_the_Color_Caves | Atari 800 |
| Alfa Boot | Atari 800 |
| Algebra_Quiz_I | Atari 800 |
| Algebra_Quiz_II | Atari 800 |
| Algicalc | Atari 800 |
| Ali Baba and the Forty Thieves | Atari 800 |
| Aliants | Atari 800 |
| Alice in Wonderland | Atari 800 |
| Alien | Atari 800 |
| Alien Asylums (19xx)(-)[BASIC] | Atari 800 |
| Alien Attack | Atari 800 |
| Alien Blast | Atari 800 |
| Alien Bugs (19xx)(-) | Atari 800 |
| Alien Egg | Atari 800 |
| Alien Encounter v.II (1984)(D.Firth) | Atari 800 |
| AlienGarden | Atari 800 |
| Alien_Ambush_DANA | Atari 800 |
| Alien_Barrage | Atari 800 |
| Alien_Craft! | Atari 800 |
| Alien_Hell | Atari 800 |
| Alien_Swarm | Atari 800 |
| Alien_Trap | Atari 800 |
| Alienbusters (1991)(Blackfire!)[t][k-file] | Atari 800 |
| Aliencounter_Face_Flash | Atari 800 |
| Aliens | Atari 800 |
| Aliens_Genocide | Atari 800 |
| All-Pro Football | Atari 800 |
| All-Pro Football - Chalkboard | Atari 800 |
| All_Star_Baseball | Atari 800 |
| Alley Cat (1983)(Synapse) | Atari 800 |
| Allies | Atari 800 |
| Ally_Attack | Atari 800 |
| Alone in the Dark - Part I | Atari 800 |
| Alone in the Dark - Part II | Atari 800 |
| Alp Man (1983)(Gemini)[k-file] | Atari 800 |
| Alpha Shield (1982)(Sirius) | Atari 800 |
| Alpha_Run | Atari 800 |
| Alphabet Bee | Atari 800 |
| Alphabet Maze (19xx)(Jeffrey Stanton) | Atari 800 |
| Alphabet_Music | Atari 800 |
| Alphabet_Zoo | Atari 800 |
| Alptraum | Atari 800 |
| Alternate Reality the City | Atari 800 |
| Alternate Reality the Dungeon | Atari 800 |
| Alternity | Atari 800 |
| Amaurote (1987)(Mastertronic) | Atari 800 |
| Amaze (19xx)(-)[k-file] | Atari 800 |
| Amazed (19xx)(Remington Steele)[noATR][k-file] | Atari 800 |
| Amazing (1985)(Antic Magazine)[k-file] | Atari 800 |
| Amazing Maze (19xx)(Scott Martin)(PD)[k-file] | Atari 800 |
| Americas Cup | Atari 800 |
| Amnesia | Atari 800 |
| Amp! | Atari 800 |
| Amphibian! (19xx)(Business Data)[k-file] | Atari 800 |
| Anagrams | Atari 800 |
| Analog Man (19xx)(David Plotkin)[k-file] | Atari 800 |
| Ancient Empire | Atari 800 |
| Android (199x)(K-Soft)[k-file] | Atari 800 |
| Android_Attack | Atari 800 |
| Android_Nim | Atari 800 |
| Andromeda (1982)(Gebelli) | Atari 800 |
| Andromeda Conquest | Atari 800 |
| Androton (19xx)(Analog)[k-file] | Atari 800 |
| Andru (19xx)(-)[BASIC] | Atari 800 |
| Anduril | Atari 800 |
| Angel Azul | Atari 800 |
| Angleworms II (19xx)(S. Ockers)[k-file] | Atari 800 |
| Animal_World | Atari 800 |
| Animated Puzzle | Atari 800 |
| Ankh (19xx)(-)[cr Kilroy][b][k-file] | Atari 800 |
| Another Boring Space Invader Game | Atari 800 |
