MAME ROMs - O
» Off Road Challenge (v1.10) (offrodc1; 1997; Midway)
» Off Road Challenge (v1.30) (offrodc3; 1997; Midway)
» Off Road Challenge (v1.40) (offroadc; 1997; Midway)
» Off the Wall (2-player cocktail) (offtwalc; 1991; Atari Games)
» Off the Wall (2/3-player upright) (offtwall; 1991; Atari Games)
» Off the Wall (Sente) (otwalls; 1984; Bally/Sente)
» Office Yeo In Cheon Ha (version 1.2) (officeye; 2001; Danbi)
» Oh My God! (Japan) (ohmygod; 1993; Atlus)
» Ohgon no Siro (Japan) (ogonsiro; 1986; Taito Corporation)
» Oigas (bootleg) (oigas; 1986; bootleg)
» Oishii Puzzle Ha Irimasenka (oisipuzl; 1993; Sunsoft + Atlus)
» Ojanko Club (Japan) (ojankoc; 1986; V-System Co.)
» Ojanko High School (Japan) (ojankohs; 1988; V-System Co.)
» Ojanko Yakata 2bankan (Japan) (ojanko2; 1987; V-System Co.)
» Ojanko Yakata (Japan) (ojankoy; 1986; V-System Co.)
» Ojousan [BET] (Japan 870108) (ojousanm; 1987; Nichibutsu)
» Ojousan (Japan 871204) (ojousan; 1987; Nichibutsu)
» Oli-Boo-Chu (olibochu; 1981; Irem + GDI)
» Olympic Soccer '92 (olysoc92; 1992; Seibu)
» Omega (omega; 19??; bootleg?)
» Omega Fighter (omegaf; 1989; UPL)
» Omega Fighter Special (omegafs; 1989; UPL)
» Omega Race (omegrace; 1981; Midway)
» Omni (omni; 19??; bootleg)
» Omotesandou (Japan 890215) (omotesnd; 1989; ANIME TEC)
» One Shot One Kill (oneshot; 19??;
» One + Two (onetwo; 1997; Barko)
» One + Two (earlier) (onetwoe; 1997; Barko)
» Oni - The Ninja Master (Japan) (nmaster; 1995; Banpresto/Pandorabox)
» Onna Sansirou - Typhoon Gal (set 1) (onna34ro; 1985; Taito)
» Onna Sansirou - Typhoon Gal (set 2) (onna34ra; 1985; Taito)
» Opa Opa (MC-8123, 317-0042) (opaopa; 1987; Sega)
» Open Mahjong [BET] (Japan) (openmj; 19??; Sapporo Mechanic)
» Operation Bear (bootleg of Operation Wolf) (opwolfb; 1987; [Taito] (Bear Corporation Korea bootleg))
» Operation Thunder Hurricane (ver UAA) (thunderh; 1996; Konami)
» Operation Thunderbolt (Japan) (othundrj; 1988; Taito Corporation)
» Operation Thunderbolt (US) (othundu; 1988; Taito America Corporation)
» Operation Thunderbolt (US, older) (othunduo; 1988; Taito America Corporation)
» Operation Thunderbolt (World) (othunder; 1988; Taito Corporation Japan)
» Operation Tiger (optiger; 1998; Taito)
» Operation Wolf 3 (US) (opwolf3u; 1994; Taito America Corporation)
» Operation Wolf 3 (World) (opwolf3; 1994; Taito Corporation Japan)
» Operation Wolf (US) (opwolfu; 1987; Taito America Corporation)
» Operation Wolf (World, set 1) (opwolf; 1987; Taito Corporation Japan)
» Operation Wolf (World, set 2) (opwolfa; 1987; Taito Corporation Japan)
» Orange Club - Maru-hi Ippatsu Kaihou [BET] (Japan 880221) (orangeci; 1988; Daiichi Denshi)
» Orange Club - Maruhi Kagai Jugyou (Japan 880213) (orangec; 1988; Daiichi Denshi)
» Orbit (orbit; 1978; Atari)
» Orbitron (orbitron; 19??; Signatron USA)
» Orbs (10/7/94 prototype?) (orbs; 1994; American Sammy)
» Ordyne (Japan) (ordynej; 1988; Namco)
» Ordyne (Japan, English Version) (ordyne; 1988; Namco)
» Oriental Legend Super / Special (100) (olds100; 1999; IGS)
» Oriental Legend Super / Special (100 alt) (olds100a; 1999; IGS)
» Oriental Legend Super / Special (Korea 101) (olds; 1999; IGS)
» Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 105, Korean Board) (orld105k; 1997; IGS)
» Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 111, Chinese Board) (orld111c; 1997; IGS)
» Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 112) (orlegnde; 1997; IGS)
» Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 112, Chinese Board) (orlegndc; 1997; IGS)
» Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 126) (orlegend; 1997; IGS)
» Osman (World) (osman; 1996; Mitchell)
» Othello Derby (Japan) (othldrby; 1995; Sunwise)
» Othello Shiyouyo (J 980423 V1.002) (othellos; 1998; Success)
» Otogizoushi Urashima Mahjong (urashima; 1989; UPL)
» Otona no Mahjong (Japan 880628) (otonano; 1988; Apple)
» Out Run (bootleg) (outrunb; 1986; bootleg)
» Out Run (deluxe sitdown) (outrun1; 1986; Sega)
» Out Run (Mega-Tech, SMS based) (mt_orun; 1987; Sega)
» Out Run (sitdown/upright, Rev A) (outrun2; 1986; Sega)
» Out Run (sitdown/upright, Rev B) (outrun; 1986; Sega)
» Out Zone (set 1) (outzone; 1990; Toaplan)
» Out Zone (set 2) (outzonea; 1990; Toaplan)
» Out Zone (set 3, prototype?) (outzoneb; 1990; Toaplan)
» Out Zone (set 4) (outzonec; 1990; Toaplan)
» Outfoxies (outfxies; 1994; Namco)
» Outfoxies (Japan) (outfxesj; 1994; Namco)
» Outline (outline; 1982; Century Electronics)
» OutRunners (US) (orunneru; 1992; Sega)
» OutRunners (World) (orunners; 1992; Sega)
» OutTrigger (JPN, USA, EXP, KOR, AUS) (otrigger; 1999; Sega)
» Over Drive (overdriv; 1990; Konami)
» Over Rev (Revision A) (overrev; 1997; Jaleco)
» Over Top (overtop; 1996; ADK)
» Ozma Wars (set 1) (ozmawars; 1979; SNK)
» Ozma Wars (set 2) (ozmawar2; 1979; SNK)
» Ozon I (ozon1; 1983; Proma)
