| Type | Game | Year | Publisher |
|---|
|
| Atari 400/800 type-in | Operation: Sabotage | 1982 | SoftSide Publications, Inc. |
|
| PC/MS-Windows CD | Operation: Weather Disaster | 1995 | Discovery Channel Multimedia |
|
| Coin-op Misc. game | Optometer | 1889 | Green, Bruce [High Holborn, England] |
|
| Arcade Video game | Orbit | 1978 | Atari, Inc. [CA, USA] |
|
| Vending Machine | Orbit | 1901 | Mills Novelty Co. [Chicago, IL, USA] |
|
| BASIC soft. type-in | Orbit | 1978 | Workman Publishing [NY, USA] |
|
| Vending Machine | Orbit Jr. | 1901 | Mills Novelty Co. [Chicago, IL, USA] |
|
| Arcade Video game | Orbs | 1994 | American Sammy Corp. [Torrance, CA, USA] |
|
| IGS PGM cart. | Oriental Legend | 1997 | IGS Co., Ltd. [International Game System] |
|
| Apple II type-in | Orienteering at Jacque's Coulee | 1981 | SoftSide Publications, Inc. |
|
| SNK Neo-Geo CD | Oshidashi Zintrick [Model ADCD-104] | 1996 | SNK Corp. [Shin Nihon Kikaku] [Japan] |
|
| Data General Nova soft. | Ostrich | 1971 | Arnold & Newborn |
|
| Data General Nova soft. | Ostrich Ver.4 | 1978 | Arnold & Newborn |
|
| Nintendo Super Famicom cart. | Osu!! Karate-bu [Model SHVC-OJ] | 1994 | Culture Brain |
|
| Amstrad CPC type-in | Othello | 1985 | Shift Editions [Paris, France] |
|
| Intel 8080 CPU soft. | Othello | 1978 | Bell, Dave |
|
| Bally Astrocade cass. | Othello | 1980 | Cursor Group, The |
|
| Bally Astrocade cass. | Othello | 198? | Perkins & Brigden |
|
| Arcade Video game | Otomedius | 2007 | Konami Digital Ent. Co., Ltd. |
|
| Casio PB-100 type-in | Ougon'noken | 1985 | Dempa Shinbunsha [Japan] |
|
| Commodore VIC-20 type-in | Our First Game Program | 1983 | NET Soft. |
|
| Amstrad CPC 464 disk | Out Board | 1990 | Loriciels [France] |
|
| Atari 2600 cart. | Out of Control [Model 50050] | 1983 | Avalon Hill Video Game Co., The [Baltimore, MD, USA] |
|
| Arcade Video game | Out Run | 1986 | SEGA Enterprises, Ltd. [Tokyo, Japan] |
|
| Sega Mega Drive cart. | Out Run [Model G-4052] | 1991 | SEGA Enterprises, Ltd. [Tokyo, Japan] |
|
| Arcade Video game | Out Runners | 1992 | SEGA Enterprises, Ltd. [Tokyo, Japan] |
|
| Arcade Video game | Outburst4D | 1995 | Taito Corp. [Japan] |
|
| DEC PDP-7 soft. | OUTFLT [No. 7-23] | 1966 | DECUS [Digital Equipment Computer Users' Society] |
|
| Thomson TO7 type-in | Outils | 1984 | Shift Editions [Paris, France] |
|
| Arcade Video game | Outpost | 1982 | Cinematronics, Inc. [El Cajon, CA, USA] |
|
| Sega Mega Drive cart. | OutRun 2019 [Model T-44033] | 1993 | SIMS Co., Ltd. [Japan] |
|
| Nintendo Famicom cart. | Over Horizon [Model GAM-Z6] | 1991 | Hot-B [Japan] |
|
| SNK Neo-Geo MVS cart. | Over Top | 1996 | ADK Corp. [Japan] |
|
| Sony PlayStation CD-ROM | OverBlood [Model SLPS-00392] | 1996 | Riverhill Soft. [Japan] |
|
| NEC PC-Engine HuCARD | Override [Model DE90006] | 1991 | Data East Corp. [Japan] |
|
| Arcade Video game | P'tooie Louie | 198? | Bally Midway Mfg. Co. [Franklin Park, IL, USA] |
|
| Jaleco Mega System 32 cart. | P-47 Aces | 1995 | JALECO Co., Ltd. [Japan] |
|
| Magnavox Odyssey² cart. | P.T. Barnum's Acrobats! [Model AC9443] | 1982 | Philips Corp. |
|
| IBM System/370 soft. | PAASLOW | 1977 | Jesen & Truscott & Bierman |
|
| Sega Game Gear cart. | Pac-In-Time | 199? | NAMCO, Ltd. [Japan] |
|
| NEC PC-8001mkIISR cass. | Pac-Land [Model E-G137] | 1985 | Enix, Ltd. [Japan] |
