ARCADE ROMS

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1. Off Road Challenge from Midway (1997)
2. Off the Wall (2-player cocktail) from Atari Games (1991)
3. Off the Wall (2/3-player upright) from Atari Games (1991)
4. Off the Wall (Sente) from Bally/Sente (1984)
5. Oh My God! (Japan) from Atlus (1993)
6. Ohgon no Siro (Japan) from Taito Corporation (1986)
7. Oigas (bootleg) from bootleg (1986)
8. Oishii Puzzle Ha Irimasenka from Sunsoft + Atlus (1993)
9. Ojanko Club (Japan) from V-System Co. (1986)
10. Ojanko High School (Japan) from V-System Co. (1988)
11. Ojanko Yakata (Japan) from V-System Co. (1986)
12. Ojanko Yakata 2bankan (Japan) from V-System Co. (1987)
13. Ojousan (Japan 871204) from Nichibutsu (1987)
14. Ojousan [BET] (Japan 870108) from Nichibutsu (1987)
15. Oli-Boo-Chu from Irem + GDI (1981)
16. Olympic Soccer '92 from Seibu (1992)
17. Omega from bootleg? (19??)
18. Omega Fighter from UPL (1989)
19. Omega Fighter Special from UPL (1989)
20. Omega Race from Midway (1981)
21. Omotesandou (Japan 890215) from ANIME TEC (1989)
22. One + Two from Barko (1997)
23. One Shot One Kill from (199?)
24. Oni - The Ninja Master (Japan) from Banpresto/Pandorabox (1995)
25. Onna Sansirou - Typhoon Gal (set 1) from Taito (1985)
26. Onna Sansirou - Typhoon Gal (set 2) from Taito (1985)
27. Opa Opa from Sega (198?)
28. Operation Bear from bootleg (1987)
29. Operation Thunderbolt (US from Taito America Corporation (1988)
30. Operation Thunderbolt (US) from Taito America Corporation (1988)
31. Operation Thunderbolt (World) from Taito Corporation Japan (1988)
32. Operation Wolf (US) from Taito America Corporation (1987)
33. Operation Wolf 3 (US) from Taito America Corporation (1994)
34. Operation Wolf 3 (World) from Taito Corporation Japan (1994)
35. Orange Club - Maru-hi Ippatsu Kaihou [BET] (Japan 880221) from Daiichi Denshi (1988)
36. Orange Club - Maruhi Kagai Jugyou (Japan 880213) from Daiichi Denshi (1988)
37. Orbit from Atari (1978)
38. Orbitron from Signatron USA (19??)
39. Ordyne (Japan) from Namco (1988)
40. Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 105 from IGS (1997)
41. Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 111 from IGS (1997)
42. Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 112 from IGS (1997)
43. Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 112) from IGS (1997)
44. Oriental Legend / Xi Yo Gi Shi Re Zuang (ver. 126) from IGS (1997)
45. Oriental Legend Super (100 alt) from IGS (1999)
46. Oriental Legend Super (100) from IGS (1999)
47. Oriental Legend Super (Korea 101) from IGS (1999)
48. Osman from Mitchell (1996)
49. Othello Derby (Japan) from Sunwise (1995)
50. Otona no Mahjong (Japan 880628) from Apple (1988)
51. Out Run (Deluxe?) from Sega (1986)
52. Out Run (set 1) from Sega (1986)
53. Out Run (set 2) from Sega (1986)
54. Out Run (set 3) from bootleg (1986)
55. Out Zone (set 1) from Toaplan (1990)
56. Out Zone (set 2) from Toaplan (1990)
57. Outfoxies from Namco (1994)
58. Outfoxies (Japan) from Namco (1994)
59. Outline from Century Electronics (1982)
60. OutRunners (US) from Sega (1992)
61. Over Drive from Konami (1990)
62. Ozma Wars (set 1) from SNK (1979)
63. Ozma Wars (set 2) from SNK (1979)
64. Ozon I from Proma (1983)