| Type | Game | Year | Publisher |
|---|
|
| TRS-80 cass. | Olympic Decathlon | 1980 | Microsoft |
|
| Pinball | Olympic Hockey | 1972 | Williams Mfg. Co. [Chicago, IL, USA] |
|
| Arcade Video game | Omega Fighter [Model UPL-89016] | 1989 | UPL Co., Ltd. [Universal PlayLand] |
|
| Commodore VIC-20 cart. | Omega Race | 1982 | Commodore, Ltd. |
|
| Arcade Video game | Omega Race [Upright model] [Model 929] | 1981 | Midway Mfg. Co. [Schiller Park, IL, USA] |
|
| NEC PC-8001 type-in | Omotesandou Adventure #1 | 1982 | ASCII Corp. [Japan] |
|
| Sharp MZ-80K type-in | Omotesandou Adventure #1 | 1982 | ASCII Corp. [Japan] |
|
| Pinball | On Beam | 1969 | Bally Mfg. Co. [Chicago, IL, USA] |
|
| IBM PC/AT DOS 3.5in. disk | On Disk Monthly Issue 62 | 1991 | Softdisk Publishing |
|
| BASIC soft. type-in | One Check | 1978 | Workman Publishing [NY, USA] |
|
| Sharp MZ-80K type-in | One Key Organ | 1982 | Kohgaku-Sha Co.,Ltd. |
|
| Sinclair ZX-81 cass. | One Little Ghost | 201? | Cronosoft |
|
| IBM PC/AT DOS 3.5in. disk | Onesimus - A Quest for Freedom | 1992 | Ark Multimedia Publishing |
|
| Arcade Video game | Onna Sansirou - Typhoon Gal | 1985 | Taito Corp. [Japan] |
|
| Arcade Video game | Oo-edo Fight | 1994 | Kaneko Co., Ltd. [Tokyo, Japan] |
|
| Arcade Video game | OOPArts | 1992 | SEGA Enterprises, Ltd. [Tokyo, Japan] |
|
| Arcade Video game | OOPS | 1978 | Vectorbeam [Union City, CA, USA] |
|
| NEC PC-8001mkII cass. | Oozumou | 1983 | Champion Soft. [Japan] |
|
| Fujitsu FM-7 cass. | Oozumou [Model FUCP-13032] | 1983 | Champion Soft. [Japan] |
|
| Pinball | Op-Pop-Pop [Model 833] | 1968 | Bally Mfg. Co. [Chicago, IL, USA] |
|
| DEC PDP-5 soft. | OPAK [No. 5-2.1] | 1965 | DECUS [Digital Equipment Computer Users' Society] |
|
| IBM PC/AT DOS 3.5in. disk | Operation Crusader | 1994 | Avalon Hill Video Game Co., The [Baltimore, MD, USA] |
|
| SNK Neo-Geo MVS cart. | Operation Ragnarok | 1994 | NMK |
|
| Atari Falcon 030 disk | Operation SKUUM | 1996 | Logitron |
|
| Arcade Video game | Operation Thunder Hurricane | 1997 | Konami Co., Ltd. [Japan] |
|
| Pinball | Operation Thunder [Model 732] | 1992 | Premier Technology Co. [Bensenville, IL, USA] |
|
| Arcade Video game | Operation Thunderbolt | 1988 | Taito Corp. [Japan] |
|
| Arcade Video game | Operation Wolf | 1987 | Taito Corp. [Japan] |
|
| Arcade Video game | Operation Wolf 3 | 1994 | Taito Corp. [Japan] |
|
| TRS-80 type-in | Operation: Sabotage | 1982 | SoftSide Publications, Inc. |
|
| Apple II type-in | Operation: Sabotage | 1982 | SoftSide Publications, Inc. |
|
| Atari 400/800 type-in | Operation: Sabotage | 1982 | SoftSide Publications, Inc. |
|
| IBM PC type-in | Operation: Sabotage | 1982 | SoftSide Publications, Inc. |
|
| PC/MS-Windows CD | Operation: Weather Disaster | 1995 | Discovery Channel Multimedia |
|
| Bally Astrocade cass. | Optical Density Map | 19?? | RMH Enterprises |
|
| 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] |
|
| Sinclair ZX Spectrum cass. | Orbiter [Model 1] | 1982 | Silversoft |
|
| Arcade Video game | Orbs | 1994 | American Sammy Corp. [Torrance, CA, USA] |
|
| ZX81/Spectrum/ORIC/Atmos/Laser 200/TO7 cass. | Ordidactic | 1984 | Ere Informatique [Paris, France] |
|
| NEC PC-Engine HuCARD | Ordyne [Model NC89004] | 1989 | NAMCOT [Japan] |
|
| Sony PlayStation CD-ROM | Ore! Tomba [Model SLPS-01144] | 1997 | Whoopee Camp |
|
| CDC Cyber soft. | Oregon | 1975 | MECC [Minnesota Educational Computing Corp.] |
|
| Sharp MZ-80B type-in | Organ | 1983 | Dempa Shinbunsha [Japan] |
|
| Commodore C64 cass. | Organism | 2018 | Psytronik Soft. |
|
| 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. |
|
| PLATO soft. | Orthanc | 1975 | Resch & Kemp & Hagstrom |
|
| RCA COSMAC VIP type-in | Ortho | 1980 | Association of Computer Experimenters |
|
| UNIVAC 1100 Series soft. | Orwell | 1975 | Nitsche, Thomas |
|
| Nintendo Game Boy Cart. | Osawagase! Penguin Boy [Model DMG-PNJ] | 1990 | Natsume, Inc. [Japan] |
|
| Atari 2600 cart. | Oscar's Trash Race [Model CX26101] | 1983 | Atari, Inc. [CA, USA] |
|
| Arcade Video game | Oshaberi Macha Monoshiri Quiz | 1983 | Logitec Co., Ltd. |
|
| SNK Neo-Geo CD | Oshidashi Zintrick [Model ADCD-104] | 1996 | SNK Corp. [Shin Nihon Kikaku] [Japan] |
|
| Nintendo Super Famicom cart. | Osu!! Karate-bu [Model SHVC-OJ] | 1994 | Culture Brain |
|
| Amstrad CPC type-in | Othello | 1985 | Shift Editions [Paris, France] |
|
| FORTRAN soft. type-in | Othello | 1977 | Creative Computing Soft. |
|
| Bally Astrocade cass. | Othello | 1980 | Cursor Group, The |
|
| Arcade Video game | Otomedius | 2007 | Konami Digital Ent. Co., Ltd. |
|
| Commodore C64 disk | Oubliette | 1983 | Aviva Soft. |
|
| 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 | Out Zone [TP-018] | 1990 | Toaplan Co., 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] |
|
| 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] |
