| Name | Description | Year | Manufacturer | Rom | Clone | Sample |
| orbite | Orbite (prototype) | 1979? | Model Racing | | | |
| orbitor1 | Orbitor 1 | 1982 | Stern | | | genpin |
| orbitron | Orbitron | 1982 | Comsoft (Signatron USA license) | | | |
| orbituvi | UVI Compu-Game | 198? | Orbit Electronics | | | |
| orbs | Orbs (10/7/94 prototype?) | 1994 | American Sammy | | | |
| orca_ovg_40c | Orca OVG 40c video PCB | | | | | |
| orchidms | Orchid Mist (0200849V, NSW/ACT) | 1999 | Aristocrat | aristmk5 | | |
| orchidmsa | Orchid Mist (0100849V, NSW/ACT) | 1999 | Aristocrat | orchidms | orchidms | |
| orchidmsnz | Orchid Mist (0101241V, New Zealand) | 2000 | Aristocrat | orchidms | orchidms | |
| ordentv | Ordenador-TV (Spain) | 2007 | Taikee / V-Tac | | | |
| ordisava | Ordisavant (France) | 1988 | Video Technology / Yeno | | | |
| ordyne | Ordyne (World) | 1988 | Namco | | | |
| ordynej | Ordyne (Japan) | 1988 | Namco | ordyne | ordyne | |
| ordyneje | Ordyne (Japan, English Version) | 1988 | Namco | ordyne | ordyne | |
| oric_jasmin | Jasmin floppy drive interface | | | | | |
| oric_microdisc | Microdisc floppy drive interface | | | | | |
| oric1 | Oric-1 | 1983 | Tangerine | | | |
| orica | Oric Atmos | 1984 | Tangerine | oric1 | oric1 | |
| oricext_connector | ORIC extension connector | | | | | |
| orion128 | Orion 128 | 1990 | <unknown> | | | |
| orionide | Orion 128 + Z80 Card II + IDE | 1990 | <unknown> | orion128 | orion128 | |
| orionidm | Orion 128 + Z80 Card II + IDE (MS7007) | 1990 | <unknown> | orion128 | orion128 | |
| orionms | Orion 128 (MS7007) | 1990 | <unknown> | orion128 | orion128 | |
| orionpro | Orion Pro | 1994 | <unknown> | orion128 | orion128 | |
| orionz80 | Orion 128 + Z80 Card II | 1990 | <unknown> | orion128 | orion128 | |
| orionzms | Orion 128 + Z80 Card II (MS7007) | 1990 | <unknown> | orion128 | orion128 | |
| orius | Orius (ver UAA) | 1991 | Konami | xexex | xexex | |
| orizon | Orizon-Micro | 199? | <unknown> | spectrum | spectrum | |
| orleg2 | Oriental Legend 2 (V104, Oversea) | 2007 | IGS | | | |
| orleg2_101 | Oriental Legend 2 (V101, Oversea) | 2007 | IGS | orleg2 | orleg2 | |
| orleg2_101cn | Xiyou Shi E Zhuan 2 (V101, China) | 2007 | IGS (Huatong license) | orleg2 | orleg2 | |
| orleg2_101jp | Saiyuu Shakuyakuden 2 (V101, Japan) | 2007 | IGS (Alta license) | orleg2 | orleg2 | |
| orleg2_103 | Oriental Legend 2 (V103, Oversea) | 2007 | IGS | orleg2 | orleg2 | |
| orleg2_103cn | Xiyou Shi E Zhuan 2 (V103, China) | 2007 | IGS (Huatong license) | orleg2 | orleg2 | |
| orleg2_103jp | Saiyuu Shakuyakuden 2 (V103, Japan) | 2007 | IGS (Alta license) | orleg2 | orleg2 | |
| orleg2_104cn | Xiyou Shi E Zhuan 2 (V104, China) | 2007 | IGS (Huatong license) | orleg2 | orleg2 | |
| orleg2_104jp | Saiyuu Shakuyakuden 2 (V104, Japan) | 2007 | IGS (Alta license) | orleg2 | orleg2 | |
| orlegend | Oriental Legend / Xiyou Shi E Zhuan (ver. 126) | 1997 | IGS | pgm | | |
| orlegend105k | Oriental Legend / Xiyou Shi E Zhuan (ver. 105, Korean Board) | 1997 | IGS | orlegend | orlegend | |
| orlegend105t | Oriental Legend / Xiyou Shi E Zhuan (ver. 105, Taiwanese Board) | 1997 | IGS | orlegend | orlegend | |
| orlegend111c | Oriental Legend / Xiyou Shi E Zhuan (ver. 111, Chinese Board) | 1997 | IGS | orlegend | orlegend | |
| orlegend111k | Oriental Legend / Xiyou Shi E Zhuan (ver. 111, Korean Board) | 1997 | IGS | orlegend | orlegend | |
| orlegend111t | Oriental Legend / Xiyou Shi E Zhuan (ver. 111, Taiwanese Board) | 1997 | IGS | orlegend | orlegend | |
| orlegendc | Oriental Legend / Xiyou Shi E Zhuan (ver. 112, Chinese Board) | 1997 | IGS | orlegend | orlegend | |
| orlegendca | Oriental Legend / Xiyou Shi E Zhuan (ver. ???, Chinese Board) | 1997 | IGS | orlegend | orlegend | |
| orlegende | Oriental Legend / Xiyou Shi E Zhuan (ver. 112) | 1997 | IGS | orlegend | orlegend | |
| ormatu | Ormatu 2001 | 198? | Ormatu Electronics | | | |
| orunners | OutRunners (World) | 1992 | Sega | | | |
| orunnersj | OutRunners (Japan) | 1992 | Sega | orunners | orunners | |
| orunnersu | OutRunners (US) | 1992 | Sega | orunners | orunners | |
| os214 | Rabbit Printer (model OS-214) | 1996 | Argox | | | |
| osa_analyst | Saitek OSA Analyst | | | osa_maestro | | |
| osa_maestro | Saitek OSA Maestro B-D | | | | | |
| osa_maestroa | Saitek OSA Maestro A | | | | | |
| osa_sparc | Saitek OSA Sparc | | | | | |
| osbexec | Executive | 1982 | Osborne | | | |
| osborne1 | Osborne-1 | 1981 | Osborne | | | |
| osborne1nv | Osborne-1 (Nuevo Video) | 1984 | Osborne/Nuevo | osborne1 | osborne1 | |
| osborne1sp | Osborne-1 with SCREEN-PAC | 1983 | Osborne | osborne1 | osborne1 | |
| osc1000b | OSCOM 1000B | 1977 | OSCOM Oy | tmc1800 | tmc1800 | |
| oscar | Psycho-Nics Oscar (World revision 0) | 1987 | Data East Corporation | | | |
| oscara5 | Oscar (0200348V, NSW/ACT) | 1996 | Aristocrat | aristmk5 | | |
| oscara5a | Oscar (0100348V, NSW/ACT) | 1996 | Aristocrat | oscara5 | oscara5 | |
| oscarbl | Psycho-Nics Oscar (World revision 0, bootleg) | 1987 | bootleg | oscar | oscar | |
| oscarj1 | Psycho-Nics Oscar (Japan revision 1) | 1987 | Data East Corporation | oscar | oscar | |
| oscarj2 | Psycho-Nics Oscar (Japan revision 2) | 1987 | Data East Corporation | oscar | oscar | |
| oscaru | Psycho-Nics Oscar (US) | 1988 | Data East USA | oscar | oscar | |
| osman | Osman (World) | 1996 | Mitchell | | | |
| otatidai | Disco Mahjong Otachidai no Okite (Japan) | 1995 | Sphinx | | | |
| otchart | Off The Charts (Russian) | 2000 | WMS | | | |
| otenamhf | Otenami Haiken Final (V2.07JC 2005/04/20 15:36) | 2005 | Success / Warashi | coh3002t | | |
| otenamih | Otenami Haiken (V2.04J 1999/02/01 18:00:00) | 1999 | Success | coh3002t | | |
| otenki | Otenki Kororin (V2.01J 2001/07/02 10:00) | 2001 | Takumi | coh3002t | | |
| othello | Othello (version 3.0) | 1984 | Success | | | |
| othellos | Othello Shiyouyo (J 980423 V1.002) | 1998 | Success | stvbios | | |
| othldrby | Othello Derby (Japan) | 1995 | Sunwise | | | |
| othunder | Operation Thunderbolt (World, rev 1) | 1988 | Taito Corporation Japan | | | |
| othunderj | Operation Thunderbolt (Japan) | 1988 | Taito Corporation | othunder | othunder | |
| othunderjsc | Operation Thunderbolt (Japan, SC) | 1988 | Taito Corporation | othunder | othunder | |
| othundero | Operation Thunderbolt (World) | 1988 | Taito Corporation Japan | othunder | othunder | |
| othunderu | Operation Thunderbolt (US, rev 1) | 1988 | Taito America Corporation | othunder | othunder | |
| othunderua | Operation Thunderbolt (US) | 1988 | Taito America Corporation | othunder | othunder | |
| oti111_vga | Oak Technologies Spitfire 64111 i/f | | | | | |
| oti64111_pci | OTI-64111 "Spitfire" | | | | | |
| otomedius | Otomedius (ver GGG:J:A:A:2008041801) | 2007 | Konami | | | |
| otonano | Otona no Mahjong (Japan 880628) | 1988 | Apple | | | |
| otrail | The Oregon Trail | 2017 | Basic Fun | | | |
| otrigger | OutTrigger | 1999 | Sega | naomi | | |
| otwalls | Off the Wall (Sente) (10/16/84) | 1984 | Bally/Sente | | | |
| ougonhai | Mahjong Ougon no Hai (Japan) | 1991 | Dynax | | | |
| ougonhaib1 | Mahjong Ougon no Hai (Japan bootleg set 1, medal) | 1991 | bootleg | ougonhai | ougonhai | |
| ougonhaib2 | Mahjong Ougon no Hai (Japan bootleg set 2, medal) | 1991 | bootleg | ougonhai | ougonhai | |
| ougonhaib3 | Mahjong Ougon no Hai (Japan bootleg set 3, medal) | 1991 | bootleg | ougonhai | ougonhai | |
| outbackj | Outback Jack (20195211, NSW/ACT) | 2005 | Aristocrat | aristmk6 | | |
| outfxies | The Outfoxies (World, OU2) | 1994 | Namco | | | |
| outfxiesa | The Outfoxies (Korea?) | 1994 | Namco | outfxies | outfxies | |
| outfxiesj | The Outfoxies (Japan, OU1) | 1994 | Namco | outfxies | outfxies | |
| outfxiesja | The Outfoxies (Japan, OU1, alternate GFX ROMs) | 1994 | Namco | outfxies | outfxies | |
| outlaw | Outlaw | 1976 | Atari | | | |
| outline | Outline | 1982 | Century Electronics | radarzon | radarzon | |
| output_latch | Output Latch | | | | | |
| outr2 | OutRun 2 (Rev A) (GDX-0004A) | 2003 | Sega | chihiro | | |
| outr2sdx | OutRun 2 SP SDX | 2006 | Sega | lindbios | | |
| outr2st | OutRun 2 Special Tours (Rev A) (GDX-0014A) | 2004 | Sega | chihiro | | |
| outr2stj | OutRun 2 Special Tours (Japan, Rev A) (GDX-0011A) | 2004 | Sega | outr2st | outr2st | |
| outr2stjo | OutRun 2 Special Tours (Japan) (GDX-0011) | 2004 | Sega | outr2st | outr2st | |
| outr2sto | OutRun 2 Special Tours (GDX-0014) | 2004 | Sega | outr2st | outr2st | |
| outrun | Out Run (sitdown/upright, Rev B) | 1986 | Sega | | | |
| outrunb | Out Run (bootleg) | 1986 | bootleg | outrun | outrun | |
| outrundx | Out Run (deluxe sitdown) | 1986 | Sega | outrun | outrun | |
| outrundxa | Out Run (deluxe sitdown earlier version) | 1986 | Sega | outrun | outrun | |
| outrundxeh | Out Run (deluxe sitdown) (Enhanced Edition v2.0.3) | 2020 | hack (Chris White) | outrun | outrun | |
| outrundxeha | Out Run (deluxe sitdown) (Enhanced Edition v1.0.3) | 2013 | hack (Chris White) | outrun | outrun | |
| outrundxj | Out Run (Japan, deluxe sitdown) (FD1089A 317-0019) | 1986 | Sega | outrun | outrun | |
| outruneh | Out Run (sitdown/upright, Rev B) (Enhanced Edition v2.0.3) | 2020 | hack (Chris White) | outrun | outrun | |
| outruneha | Out Run (sitdown/upright, Rev B) (Enhanced Edition v1.1.0) | 2014 | hack (Chris White) | outrun | outrun | |
| outrunra | Out Run (sitdown/upright, Rev A) | 1986 | Sega | outrun | outrun | |
| outzone | Out Zone | 1990 | Toaplan | | | |
| outzonea | Out Zone (old set) | 1990 | Toaplan | outzone | outzone | |
| outzoneb | Out Zone (older set) | 1990 | Toaplan | outzone | outzone | |
| outzonec | Out Zone (oldest set) | 1990 | Toaplan | outzone | outzone | |
| outzonecv | Out Zone (Zero Wing TP-015 PCB conversion) | 1990 | Toaplan | outzone | outzone | |
| outzoneh | Out Zone (harder) | 1990 | Toaplan | outzone | outzone | |
| overdriv | Over Drive (set 1) | 1990 | Konami | | | |
| overdriva | Over Drive (set 2) | 1990 | Konami | overdriv | overdriv | |
| overdrivb | Over Drive (set 3) | 1990 | Konami | overdriv | overdriv | |
| overrev | Over Rev (Model 2C, Revision A) | 1997 | Jaleco | | | |
| overrevb | Over Rev (Model 2B, Revision B) | 1997 | Jaleco | overrev | overrev | |
| overrevba | Over Rev (Model 2B, Revision A) | 1997 | Jaleco | overrev | overrev | |
| overtop | Over Top | 1996 | ADK | neogeo | | |
| owlcap | Owl Capone (10008711, NSW/ACT, Show Program) | 2001 | Aristocrat | aristmk6 | | |
| oz750 | Wizard OZ-750 | 199? | Sharp | | | |
| ozmawars | Ozma Wars (set 1) | 1979 | SNK | | | ozmawars |
| ozmawars2 | Ozma Wars (set 2) | 1979 | SNK | ozmawars | ozmawars | ozmawars |
| ozmawarsmr | Ozma Wars (Model Racing bootleg) | 1979 | bootleg (Model Racing) | ozmawars | ozmawars | |
| ozon1 | Ozon I | 1983 | Proma | | | |
| p1_fdc | Poisk-1 floppy B504 | | | | | |
| p1_hdc | Poisk-1 MFM disk B942 | | | | | |
| p1_rom | Poisk-1 ROM cart | | | | | |
| p1_sound | Poisk-1 sound card (B623) | | | | | |
| p112 | P112 | 1996 | Dave Brooks | | | |
| p2000m | Philips P2000M | 1980 | Philips | p2000t | p2000t | |
| p2000t | Philips P2000T | 1980 | Philips | | | |
| p386dx40 | P386DX-40 | 199? | Peacock | ibm5170 | ibm5170 | |
| p386sx25pw | P386SX-25PW VER:2.00 | 199? | Prolink | ibm5170 | ibm5170 | |
| p47 | P-47 - The Phantom Fighter (World) | 1988 | Jaleco | | | |
| p47a | P-47 - The Freedom Fighter (World) | 1988 | Jaleco | p47 | p47 | |
| p47aces | P-47 Aces (ver 1.1) | 1995 | Jaleco | | | |
| p47acesa | P-47 Aces (ver 1.0) | 1995 | Jaleco | p47aces | p47aces | |
| p47bl | P-47 - The Freedom Fighter (World, bootleg) | 1988 | bootleg | p47 | p47 | |
| p47j | P-47 - The Freedom Fighter (Japan) | 1988 | Jaleco | p47 | p47 | |
| p47je | P-47 - The Freedom Fighter (Japan, Export) | 1988 | Jaleco | p47 | p47 | |
| p500 | P500 (NTSC) | 1983 | Commodore Business Machines | | | |
| p500p | P500 (PAL) | 1983 | Commodore Business Machines | p500 | p500 | |
| p5txla | P5TX-LA (i430TX) | 1997 | ECS | | | |
| p72 | NEC PinWriter P72 | | | | | |
| p8000 | P8000 (8bit Board) | 1989 | EAW electronic Treptow | | | |
| p8000_16 | P8000 (16bit Board) | 1989 | EAW electronic Treptow | p8000 | p8000 | |
| p8098 | Intel P8098 | | | | | |
| p80c552 | Philips P80C552 | | | | | |
| p80c562 | Philips P80C562 | | | | | |
| p8798 | Intel P8798 | | | | | |
| p87c552 | Philips P87C552 | | | | | |
| p8k_16_daisy | P8000 16-bit daisy chain device | | | | | |
| p911 | The Keisatsukan: Shinjuku 24-ji (ver AAE) | 2000 | Konami | kviper | | |
| p9112 | Police 911 2 (VER. UAA:B) | 2001 | Konami | kviper | | |
| p911ac | The Keisatsukan: Shinjuku 24-ji (ver AAC) | 2000 | Konami | p911 | p911 | |
| p911ed | Police 24/7 (ver EAD) | 2000 | Konami | p911 | p911 | |
| p911j | The Keisatsukan: Shinjuku 24-ji (ver JAE) | 2000 | Konami | p911 | p911 | |
| p911k | The Keisatsukan: Shinjuku 24-ji (ver KAE) | 2000 | Konami | p911 | p911 | |
| p911kc | The Keisatsukan: Shinjuku 24-ji (ver KAC) | 2000 | Konami | p911 | p911 | |
| p911ud | Police 911 (ver UAD) | 2000 | Konami | p911 | p911 | |
| pa7234 | PA7234 Pasopia PAC2 Expansion Unit | | | | | |
| pa7243 | PA7243 Pasopia RAM PAC2 (16KB) | | | | | |
| pa7245 | PA7245 Pasopia RAM PAC2 (32KB) | | | | | |
| pa7246 | PA7246 Pasopia Kanji ROM PAC2 | | | | | |
| pa7248 | PA7248 Pasopia RAM PAC2 (64KB) | | | | | |
| pabball | Pro-Action Electronic-Computerized Baseball | 1979 | Calfax / Caprice Electronics | | | |
| pac90 | Pac-Man (bootleg on World Cup '90 hardware) | 199? | bootleg (Macro) | puckman | puckman | |
| pacapp | Paca Paca Passion (Japan, PPP1/VER.A2) | 1998 | Produce / Namco | | | |
| pacapp2 | Paca Paca Passion 2 (Japan, PKS1/VER.A) | 1999 | Produce / Namco | | | |
| pacappsp | Paca Paca Passion Special (Japan, PSP1/VER.A) | 1999 | Produce / Namco | | | |
| paccarn | Pac-Carnival | 1996 | Namco | | | |
| paccon | Pac-Man Connect & Play (Feb 14 2012 10:46:23) | 2012 | Bandai | | | |
| paceight | Pac-Eight | 1996 | Namco | | | |
| pacgal | Pac-Gal (set 1) | 1981 | hack | mspacman | mspacman | |
| pacgal2 | Pac-Gal (set 2) | 1981 | bootleg | mspacman | mspacman | |
| pacheart | Pac-Man (Hearts) | 1981 | hack | puckman | puckman | |
| pachifev | Pachifever | 1983 | Sanki Denshi Kogyo | | | |
| pachiten | Medal Mahjong Pachi-Slot Tengoku (Japan) | 1993 | Nichibutsu / AV Japan / Miki Syouji | | | |
| packbang | Pack'n Bang Bang | 1994 | Kaneko | | | |
| packbangp | Pack'n Bang Bang (prototype) | 1994 | Kaneko | packbang | packbang | |
| packmon | Packri Monster | 1981 | Bandai | | | |
| packysts | Packy's Treasure Slot (Japan, main ver. 1.3, video ver. 1.1) | 1997 | Taito Corporation | | | |
| pacland | Pac-Land (World) | 1984 | Namco | | | |
| paclandj | Pac-Land (Japan new) | 1984 | Namco | pacland | pacland | |
| paclandjo | Pac-Land (Japan old) | 1984 | Namco | pacland | pacland | |
| paclandjo2 | Pac-Land (Japan older) | 1984 | Namco | pacland | pacland | |
| paclandm | Pac-Land (Midway) | 1984 | Namco (Bally Midway license) | pacland | pacland | |
| paclandm2 | Pac-Land (Bally-Midway) | 1984 | Namco (Bally Midway license) | pacland | pacland | |
| paclandp | Pac-Land (United Amusements PC Engine) | 1989 | Namco | | | |
| pacman | Pac-Man (Midway) | 1980 | Namco (Midway license) | puckman | puckman | |
| pacmanbl | Pac-Man (bootleg on Galaxian hardware, set 1) | 1981 | bootleg | puckman | puckman | |
| pacmanbla | Pac-Man (bootleg on Galaxian hardware, set 2) | 1981 | bootleg | puckman | puckman | |
| pacmanblb | Pac-Man (bootleg on Moon Alien 'AL-10A1' hardware) | 1981 | bootleg | puckman | puckman | |
| pacmanblc | Pac-Man (Calfesa, Spanish bootleg on Galaxian hardware) | 1981 | bootleg (Calfesa) | puckman | puckman | |
| pacmanblci | Pac-Man (Cirsa, Spanish bootleg on Galaxian hardware) | 1981 | bootleg (Cirsa) | puckman | puckman | |
| pacmanblv | Pac-Man (Video Dens, Spanish bootleg on Galaxian hardware, set 1) | 1981 | bootleg (Video Dens) | puckman | puckman | |
| pacmanblva | Pac-Man (Video Dens, Spanish bootleg on Galaxian hardware, set 2) | 1981 | bootleg (Video Dens) | puckman | puckman | |
| pacmanf | Pac-Man (Midway, speedup hack) | 1980 | hack | puckman | puckman | |
| pacmanfm | Pac Man (FAMARE S.A. bootleg of Puck Man) | 1980 | bootleg (FAMARE S.A.) | puckman | puckman | |
| pacmania | Pac-Mania | 1987 | Namco | | | |
| pacmaniaj | Pac-Mania (Japan) | 1987 | Namco | pacmania | pacmania | |
| pacmaniao | Pac-Mania (111187 sound program) | 1987 | Namco | pacmania | pacmania | |
| pacmanjpm | Pac-Man (JPM bootleg) | 1981 | bootleg (JPM) | puckman | puckman | |
| pacmanmr | Pac-Man (Model Racing bootleg) | 1981 | bootleg (Model Racing) | puckman | puckman | |
| pacmanpe | Come Come (Petaco SA bootleg of Puck Man) | 1980 | bootleg (Petaco SA) | puckman | puckman | |
| pacmanso | Pac-Man (SegaSA / Sonic) | 1980 | Namco (Sonic license) | puckman | puckman | |
| pacmansp | Puck Man (Spanish, 'Made in Greece' bootleg) | 198? | bootleg (Video Game SA) | puckman | puckman | |
| pacmanug | Pac Man (U.Games bootleg of Puck Man) | 1980 | bootleg (U.Games) | puckman | puckman | |
| pacmanvg | Pac-Man (Video Game SA bootleg) | 1980 | bootleg (Video Game SA) | puckman | puckman | |
| pacmball | Pacman BALL (PMB2 Ver.A.) | 2003 | Namco | | | |
| pacmod | Pac-Man (Midway, harder) | 1981 | Namco (Midway license) | puckman | puckman | |
| pacnchmp | Pac-Man & Chomp Chomp | 1983 | Namco | pacnpal | pacnpal | |
| pacnpal | Pac & Pal | 1983 | Namco | | | |
| pacnpal2 | Pac & Pal (older) | 1983 | Namco | pacnpal | pacnpal | |
| pacominv | Pacom Invader (set 1) | 1979 | Pacom Corporation | beaminv | beaminv | |
| pacominva | Pacom Invader (set 2) | 19?? | Pacom Corporation | beaminv | beaminv | |
| pacplus | Pac-Man Plus | 1982 | Namco (Midway license) | | | |
| pacslot | Pac-Slot | 1996 | Namco | | | |
| pacuman | Pacu-Man (Spanish bootleg of Puck Man) | 1980 | bootleg (Recreativos Franco S.A.) | puckman | puckman | |
| paddington | Apple Paddington PCI I/O ASIC | | | | | |
| paddle2 | Paddle 2 (bootleg on Block hardware) | 1988 | bootleg | arkanoid | arkanoid | |
| paddlema | Paddle Mania | 1988 | SNK | | | |
| painter | Painter (hack of Crush Roller) | 1984 | hack (Monshine Ent. Co.) | crush | crush | |
| paintlad | Painted Lady (Splash) (Ver. 1.3 US) | 1992 | Gaelco / OMK Software | splash | splash | |
| paintrlr | Paint Roller (bootleg of Crush Roller) | 1981 | bootleg | crush | crush | |
| pairlove | Pairs Love | 1991 | Athena / Nihon System | | | |
| pairmtch | Pair Match | 1984 | Bandai | | | |
| pairs | Pairs (V1.2, 09/30/94) | 1994 | Strata / Incredible Technologies | | | |
| pairsa | Pairs (V1, 09/07/94) | 1994 | Strata / Incredible Technologies | pairs | pairs | |
| pairsnb | Pairs (Nichibutsu) (Japan 890822) | 1989 | Nichibutsu | | | |
| pairsred | Pairs Redemption (V1.0, 10/25/94) | 1994 | Strata / Incredible Technologies | | | |
| pairsten | Pairs (System Ten) (Japan 890826) | 1989 | System Ten | pairsnb | pairsnb | |
| pajaroes | Pajaro del Espacio (Spanish bootleg of UniWar S) | 1980 | bootleg (PSV S.A.) | uniwars | uniwars | |
| pal | Myarc DDCC-1 PAL u1 | | | | | |
| palamed | Palamedes (US) | 1990 | Hot-B Co., Ltd. | | | |
| palamedj | Palamedes (Japan) | 1990 | Taito Corporation | palamed | palamed | |
| palestra | Palestra-02 | 1978 | LPO | | | |
| palette | palette | | | | | |