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The games of Origin Systems, in chronological order.
If a game's platform is not listed, then the game was originally developed for the PC.
Please /msg me if I've made an error.
1983 Caverns of Callisto (Apple II) Ultima III: Exodus (Apple II)
1985 Ultima IV: Quest of the Avatar (Apple II) Moebius: The Orb of Celestial Harmony (Apple II)
1986 Ogre (Apple II) Autoduel (Apple II)
1988 2400 AD (Apple II) Times of Lore (Apple II) Ultima V: Warriors of Destiny (Apple II)
1989 Knights of Legend (Apple II) Omega (Apple II) Space Rogue (Apple II) Tangled Tales (Apple II) Windwalker (Apple II)
1990 Bad Blood Ultima VI: The False Prophet Wing Commander Wing Commander: Secret Missions 1 Wing Commander: Secret Missions 2: Crusade Worlds of Ultima: The Savage Empire
1991 Ultima: Runes of Virtue (Game Boy) Worlds of Ultima: Martian Dreams Wing Commander II: Vengeance of the Kilrathi Wing Commander 2 Speech Pack Wing Commander 2: Special Operations 1 Wing Commander 2: Special Operations 2
1992 Ultima Underworld: The Stygian Abyss Ultima VII: The Black Gate
1993 Strike Commander Strike Commander Speech Pack Strike Commander: Tactical Operations Ultima Underworld 2: Labyrinth of Worlds Ultima VII: The Forge of Virtue Ultima VII, Part Two: The Serpent Isle Ultima VII, Part Two: The Silver Seed Ultima: Runes of Virtue 2 (Game Boy) Wing Commander Academy Wing Commander Armada Wing Commander: Privateer Wing Commander: Privateer Speech Pack Wing Commander: Privateer: Righteous Fire
1994 Pacific Strike Pacific Strike Speech Pack Pagan: Ultima VIII Pagan: Ultima VIII Speech Pack Shadowcaster System Shock Wing Commander III: Heart of the Tiger Wings of Glory
1995 Bioforge Crusader: No Remorse CyberMage: Darklight Awakening Wing Commander IV: The Price of Freedom
1996 Crusader: No Regret Privateer 2: The Darkening
1997 Ultima Online Wing Commander Prophecy
1998 Ultima Online: The Second Age Wing Commander Prophecy: Secret Ops
1999 Ultima IX: Ascension
2000 Ultima Online: Rennaissance
2002 Ultima Online: Lord Blackthorne's Revenge
2003 Ultima Online: The Age of Shadows