| Colour Genie cass. |  NODOS 80 | 198? | Unknown |
| Sharp Wizard series cart. | North American City Guide Model OZ-708A | 198? | Unknown |
| North Star Advantage disk | North Star Advantage CP/M 80 + Turbo Pascal | 198? | Unknown |
| North Star Advantage disk | North Star Computer Society #10 | 198? | Unknown |
| North Star Advantage disk | North Star Computer Society #37 | 198? | Unknown |
| North Star Advantage disk | North Star Computer Society #48 | 198? | Unknown |
| North Star Advantage disk | North Star Computer Society #58 | 198? | Unknown |
| North Star Advantage disk | North Star Computer Society #61 | 198? | Unknown |
| North Star Advantage disk | North Star CP/M + Mbasic | 198? | Unknown |
| North Star Advantage disk | North Star GBASIC NSDOS / Baud 300 | 198? | Unknown |
| North Star Advantage disk | North Star Graphics Operating System Ver.1 | 198? | Unknown |
| North Star Advantage disk | North Star Graphics Operating System Ver.2 | 198? | Unknown |
| NCR Decision Mate V disk | Norton Utilities Ver.3 | 1985 | Unknown |
| Kodak Photo CD | Notte Mitai Ressha, Ittemitai Rosen Catalog - Tetsudou no Tabi Vol. 1 - Hokkaido, Touhoku | 199? | Unknown |
| Kodak Photo CD | Notte Mitai Ressha, Ittemitai Rosen Catalog - Tetsudou no Tabi Vol. 2 - Kantou, Koushinetsu, Toukai, Hokuriku | 199? | Unknown |
| Videoton TVC disk | Novotrade-Copy | 198? | Unknown |
| TIKI-100 disk | NSD-Stat | 198? | Unknown |
| Amstrad CPC 464 disk | Numerologie | 1991 | Unknown |
| Kodak Photo CD | Nympheas - La Musique des Tableaux Celebres | 199? | Unknown |
| Vending Machine | Oasis | 193? | Unknown |
| Working Model | Oil Fields | 19?? | Unknown |
| Working Model | Old #1 | 19?? | Unknown |
| Working Model | Old King Cole | 1974 | Unknown |
| Kodak Photo CD | Oldtimer | 199? | Unknown |
| Kodak Photo CD | Opel Corsa '97 | 1997 | Unknown |
| Kodak Photo CD | Opel IAA '97 | 1997 | Unknown |
| Kodak Photo CD | Opel IAA '99 | 1999 | Unknown |
| Kodak Photo CD | Opel Vectra '99 | 1999 | Unknown |
| NCR Decision Mate V disk | OPEN ACCESS | 198? | Unknown |
| Luxor ABC 806 disk | Ord III Ver. 2.0 | 198? | Unknown |
| Commodore PET ROM | OrgaBASIC 101 | 198? | Unknown |
| Sharp Wizard series cart. | Organizer Faxt Model OZ-8B02 | 199? | Unknown |
| Musical Instrument | Orientalischer Zauberer | 1897 | Unknown |
| Musical Instrument | Orphenion Musik-Automat Model 118 | 189? | Unknown |
| Musical Instrument | Orphenion Musik-Automat Model 194 | 189? | Unknown |
| Musical Instrument | Orphenion Musik-Automat Model 72 | 189? | Unknown |
| Musical Instrument | Orphenion Musik-Automat Model 92 | 189? | Unknown |
| Texas instrument TI-99/4A cart. | OS/99 | 1992 | Unknown |
| Osborne-1 disk | Osborne 1 blank disk | 19?? | Unknown |
| Osborne 4 Vixen disk | OSBORNE 4 System Disk | 1985 | Unknown |
