Download MAME/Arcade Roms (O)

  • Oba-Oba
  • Oba-Oba (alternate set)
  • Octopus (Nova) (MPU4)
  • Odds On (Barcrest) (MPU3)
  • Odin De Luxe
  • Odisea Paris-Dakar
  • Oedo Fight (Japan Bloodshed Ver.)
  • Off Road Challenge (v1.10)
  • Off Road Challenge (v1.30)
  • Off Road Challenge (v1.40)
  • Off Road Challenge (v1.50)
  • Off Road Challenge (v1.63)
  • Off The Charts (Russia)
  • Off the Wall (2-player cocktail)
  • Off the Wall (2/3-player upright)
  • Off the Wall (Sente)
  • Off Your Face (Bellfruit) (Scorpion 4) (set 1)
  • Off Your Face (Bellfruit) (Scorpion 4) (set 2)
  • Office Yeo In Cheon Ha (version 1.2)
  • Offroad Thunder
  • Oh La La (Stella)
  • Oh My God! (Japan)
  • Oh! Paipee (Japan 890227)
  • Ohgon no Siro (Japan)
  • Oigas (bootleg)
  • Oinori-daimyoujin Matsuri
  • Oishii Puzzle Ha Irimasenka
  • Ojanko Club (Japan)
  • Ojanko High School (Japan)
  • Ojanko Yakata (Japan)
  • Ojanko Yakata 2bankan (Japan)
  • Ojousan (Japan 871204)
  • Ojousan [BET] (Japan 870108)
  • Old Coney Island!
  • Old Timer (Barcrest) (MPU4)
  • Oli-Boo-Chu
  • Ollie King (GDX-0007)
  • Olympia (Bellfruit) [Dutch] (Scorpion 1)
  • Olympian Games (Russia)
  • Olympic Games
  • Olympic Gold (Bellfruit) (Scorpion 2/3)
  • Olympic Gold (Nova) (MPU4)
  • Olympic Hot Stuff (TAS 5 Reel System)
  • Olympic Soccer ’92
  • Olympus
  • Omega
  • Omega (Barcrest) (MPU4)
  • Omega (Maygay) (M1A/B)
  • Omega Fighter
  • Omega Fighter Special
  • Omega Race (set 1)
  • Omega Race (set 2)
  • Omni
  • Omni (Shuffle) (L-1)
  • Omotesandou (Japan 890215)
  • On Line (Pcp) (MPU3)
  • On The Box (Ace) (sp.ACE)
  • On The Buses (Maygay) (M1A/B)
  • On The Fiddle (Barcrest) (MPU5)
  • On The Piste (Ace) (sp.ACE)
  • On The Up (Mazooma) (Scorpion 4) (set 1)
  • On The Up (Mazooma) (Scorpion 4) (set 2)
  • One + Two
  • One + Two (earlier)
  • One Shot One Kill
  • Oni – The Ninja Master (Japan)
  • Only Fools & Horses (Bellfruit) (Scorpion 2/3)
  • Onna Sansirou – Typhoon Gal (set 1)
  • Onna Sansirou – Typhoon Gal (set 2)
  • Ooh Aah Dracula (Barcrest) (MPU5)
  • Ooh Aah Dracula (Bwb) (MPU4)
  • Ooh Aah Dracula Club (Barcrest) (MPU5)
  • Ooh Ahh Dracula Rio (Barcrest) (MPU5)
  • Opa Opa (MC-8123, 317-0042)
  • Open Mahjong [BET] (Japan)
  • Open Sesame (Bellfruit) (Scorpion 4) (set 1)
  • Open Sesame (Bellfruit) (Scorpion 4) (set 2)
  • Open The Box (Ace) (sp.ACE)
  • Open The Box (Barcrest) (MPU5)
  • Operation Bear (bootleg of Operation Wolf)
  • Operation Thunder Hurricane (ver EAA)
  • Operation Thunder Hurricane (ver UAA)
  • Operation Thunderbolt (Japan)
  • Operation Thunderbolt (US)
  • Operation Thunderbolt (US, older)
  • Operation Thunderbolt (World)
  • Operation Tiger
  • Operation Wolf (Japan)
  • Operation Wolf (US)
  • Operation Wolf (World, set 1)
  • Operation Wolf (World, set 2)
  • Operation Wolf 3 (US)
  • Operation Wolf 3 (World)
  • Operation: Thunder
  • Option 3 (v1.0) (Datapak) (MPU4 Video)
  • Option 3 (v1.0) (MPU4 Video)
  • Options Unlimited (Barcrest) (MPU3)
  • Oracle (Bellfruit) [Dutch] (Scorpion 1)
  • Orange Club – Maru-hi Ippatsu Kaihou [BET] (Japan 880221)
  • Orange Club – Maruhi Kagai Jugyou (Japan 880213)
  • Orbit
  • Orbit 1
  • Orbitor 1
  • Orbitron
  • Orbs (10/7/94 prototype?)
  • Ordyne (Japan)
  • Ordyne (Japan, English Version)
  • Oriental Diamonds (Barcrest) (MPU4)
  • Oriental Legend / Xi You Shi E Zhuan (ver. 105, Korean Board)
  • Oriental Legend / Xi You Shi E Zhuan (ver. 111, Chinese Board)
  • Oriental Legend / Xi You Shi E Zhuan (ver. 112)
  • Oriental Legend / Xi You Shi E Zhuan (ver. 112, Chinese Board)
  • Oriental Legend / Xi You Shi E Zhuan (ver. 126)
  • Oriental Legend / Xi You Shi E Zhuan (ver. ???, Chinese Board)
  • Oriental Legend 2 (V103, China)
  • Oriental Legend 2 (V104, China)
  • Oriental Legend Special / Xi You Shi E Zhuan Super (alt ver. 100)
  • Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 100)
  • Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 101, Korean Board)
  • Oriental Legend Special Plus / Xi You Shi E Zhuan Super Plus
  • Orlando Magic (Bwb) (MPU4)
  • Osman (World)
  • Othello (version 3.0)
  • Othello Derby (Japan)
  • Othello Shiyouyo (J 980423 V1.002)
  • Otogizoushi Urashima Mahjong (Japan)
  • Otona no Mahjong (Japan 880628)
  • Out Run (bootleg)
  • Out Run (deluxe sitdown)
  • Out Run (Mega-Tech, SMS based)
  • Out Run (sitdown/upright)
  • Out Run (sitdown/upright, Rev A)
  • Out Run (sitdown/upright, Rev B)
  • Out Run 2 (Rev A) (GDX-0004A)
  • Out Run 2 Special Tours (Rev A) (GDX-0014A)
  • Out Zone (set 1)
  • Out Zone (set 2)
  • Out Zone (set 3, prototype?)
  • Out Zone (set 4)
  • Out Zone (set 5)
  • Outfoxies (Japan, OU1)
  • Outfoxies (World, OU2)
  • Outlaw (Bellfruit) (Scorpion 4) (set 1)
  • Outlaw (Bellfruit) (Scorpion 4) (set 2)
  • Outlaw (Bellfruit) (Scorpion 4) (set 3)
  • Outlaw (Bellfruit) (Scorpion 4) (set 4)
  • Outlaw (Jpm) (IMPACT, Club?)
  • Outlaw (Jpm) (IMPACT, v3)
  • Outlaw (Jpm) (IMPACT, v3) (Protocol)
  • Outline
  • OutRunners (US)
  • OutRunners (World)
  • OutTrigger (JPN, USA, EXP, KOR, AUS)
  • Over Drive
  • Over Moon Pt3 (Bwb) (MPU4 Video)
  • Over Rev (Revision A)
  • Over The Moon (Barcrest) (MPU4)
  • Over The Moon (Maygay) (EPOCH)
  • Over The Moon Club (Maygay) (EPOCH)
  • Over The Rainbow (Astra, V102)
  • Over The Rainbow (Astra, V104)
  • Over The Rainbow (Bellfruit) (Scorpion 5) (set 1)
  • Over The Rainbow (Bellfruit) (Scorpion 5) (set 2)
  • Over The Rainbow (Bellfruit) (Scorpion 5) (set 3)
  • Over The Rainbow (Bellfruit) (Scorpion 5) (set 4)
  • Over The Rainbow (Bellfruit) (Scorpion 5) (set 5)
  • Over The Rainbow (Bellfruit) (Scorpion 5) (set 6)
  • Over The Top (Maygay) (M1A/B)
  • Over Top
  • Overload (Barcrest) (MPU5)
  • Oxo (Jpm) (IMPACT)
  • Oxo Bingo (Jpm) (IMPACT)
  • Oxo Classic Gold (Electrocoin) (?)
  • Oxo Club (Electrocoin) (?)
  • Oxo Golden Bars (Electrocoin) (?)
  • Oxo Reels (Electrocoin) (?)
  • Oxo Revolution (Electrocoin) (?)
  • Ozma Wars (set 1)
  • Ozma Wars (set 2)
  • Ozon I
  • Ozzie Ozzie Ozzie (Maygay) (EPOCH)