OBERON RIK 89 ( Arnold )
 OCEAN RANGER SGF (Arnold)
 OGRATON SGF (Arnold)
 OH NO SGF (Arnold)
 OIL IMPERIUM (RELINE) - DANISH/GERMAN? SGF (Arnold)
 OIL TYCOON RIK 4 ( Arnold )
 OILS WELL ( ) SGF ( D.D. )
 OIL'S WELL Blast 130 ( Arnold )
 OIL'S WELL Jgames 2 ( Arnold )
 OILS WELL SGF (Arnold)
 OILS WELL SGF (Arnold)
 OILS WELL RIK 9 ( Arnold )
 OLE' DM 9 ( Arnold )
 OLE' SGF (Arnold)
 OLE! Blast 50 ( Arnold )
 OLLI & LISA (FIREBIRD) Blast 61 ( Arnold )
 OLLIE'S FOLLIES Blast 93 ( Arnold )
 OLLO (BUG BYTE) ollo (Arnold)
 OLLO 2 (BUG BYTE) ollo (Arnold)
 OLO Blast 91 ( Arnold )
 OLO 2 Blast 66 ( Arnold )
 OLYMPIC SKIER (MR CHIP) lappa -winterg (Arnold)
 OLYMPIC SKIER Blast 29 ( Arnold )
 OLYMPIC SKIER SGF (Arnold)
 OLYMPIC SKIER SGF (Arnold)
 OMEGA MISSION SGF (Arnold)
 OMEGA PLANET Blast 58 ( Arnold )
 OMEGA RACE (CBM) commodor (Arnold)
 OMEGA RACE Blast 24 ( Arnold )
 OMEGA RACE Jgames 9 ( Arnold )
 OMEGA RACE RIK 21 ( Arnold )
 OMICON Jgames 21 ( Arnold )
 OMICORN Blast 218 ( Arnold )
 ON-COURT TENNIS Blast 198 ( Arnold )
 ON-COURT TENNIS SGF (Arnold)
 ON-COURT TENNIS RIK 18 ( Arnold )
 ON-COURT TENNIS sports-e (Arnold)
 ON-CUE Blast 176 ( Arnold )
 ONE BITE TOO DEEP RIK 115 ( Arnold )
 ONE MAN & HIS DROID ( MASTERTRONIC ) SGF ( D.D. )
 ONE MAN AND HIS DROID (MASTERTRONIC) SGF (Arnold) SGF (Arnold)
 ONE MAN AND HIS DROID DM 33 ( Arnold )
 ONE ON ONE - JULIUS IRVING VS LARRY BIRD (EA) twallie (Arnold) req_game (Arnold)
 ONE ON ONE Blast 69 ( Arnold )
 ONE ON ONE Jgames 12 ( Arnold )
 ONE ON ONE sports-e (Arnold)
 ONFIELD FOOTBALL Blast 72 ( Arnold )
 ON-FIELD FOOTBALL RIK 35 ( Arnold )
 OPERATION ANORIA Blast 31 ( Arnold )
 OPERATION IRONHAWK Blast 53 ( Arnold )
 OPERATION SWORDFISH DM 2 ( Arnold )
 OPERATION SWORFISH RIK 57 ( Arnold )
 OPERATION THUNDERBOLT SGF (Arnold)
 OPERATION THUNDRBOLT ( OCEAN ) SGF ( D.D. )
 OPERATION WHIRLWIND DM 66 ( Arnold )
 OPERATION WOLF ( OCEAN ) SGF ( D.D. )
 OPERATION WOLF Blast 206 ( Arnold )
 OPERATION WOLF SGF (Arnold)
 OPTIMA RAX Blast 52 ( Arnold )
 ORBIT ( DOUBLE DENSITY ) SGF ( D.D. )
 O'RILEY'S MINE (DATASOFT) SGF (Arnold) collectn (Arnold)
 O'RILEYS MINE Blast 98 ( Arnold )
 O'RILEY'S MINE Jgames 25 ( Arnold )
 O'RILEY'S MINE RIK 27 ( Arnold )
 ORIN 1 SGF (Arnold)
 ORPHEUS IN THE UNDERWORLD Blast 91 ( Arnold )
 OSMIUM Blast 155 ( Arnold )
 OSSIDO KID RIK 89 ( Arnold )
 OSSIDOKID Blast 190 ( Arnold )
 OTHELLO ( ) SGF ( D.D. )
 OTHELLO Blast 98 ( Arnold )
 OTHELLO Blast 158 ( Arnold )
 OUT RUN ( US GOLD ) SGF ( D.D. )
 OUTLAWS Blast 30 ( Arnold )
 OUTLAWS SGF (Arnold)
 OUTRUN (SPECIAL UPGRADED VERSION) DM 37 ( Arnold )
 OUTRUN SGF (Arnold)
 OUTRUN SGF (Arnold)
 OUTRUN EUROPA ( US GOLD ) SGF ( D.D. )
 OUTRUN PART 4 Blast 83 ( Arnold )
 OVER THE RAINBOW Blast 110 ( Arnold )
 OVERKILL V2 kingsobe (Arnold)
 OVERLANDER ( ELITE ) SGF ( D.D. )
 OVERLANDER SGF (Arnold)
 OVERLOAD ( FELLOWS ) SGF ( D.D. )