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IJK Software wrote some of the most memorable Oric games (such as Xenon 1 and Zorgon's Revenge).

It was founded in 1982 by the three members of the Sinclair family which gave its name: John S. Sinclair who mostly wrote games, his uncle Ian who took care of the advertising and production, and his father Keith who financially helped the project.
John was still a teenager, and had to shuffle between the IJK business and finishing his studies.

Their first game was Candyfloss on BBC Model A (which was later ported to the Oric by Ian), but they also released games on Commodore 64 and Sinclair Spectrum, where there was a lot of competition, so ultimately it was on the Oric platform they made the more money.

At some point they shifted from video game development to production and distribution with their own duplication company Duplidata (which did some work for Ocean, Electronic Arts, Firebirds and other), they successfully transitioned to the floppy format but did not have the finance to move the business to CD duplication so it shut it down after a while.

Here is a list of the games they released:

On Oric 1 and Atmos:
1983 3D Maze/ Breakout
1983 Candyfloss / Hangman (Ian Sinclair)
1983 Fantasy Quest (John Wolstencroft)
1983 Invaders (Barrie Cridland)
1983 Probe 3 (Barrie Cridland)
1983 Reverse (G. Privett & M. Jones)
1983 Xenon 1 (John Sinclair)
1983 Zorgon's Revenge (John Sinclair)
1984 3D Oxo / Backgammon (M. Jones and G. Privett)
1984 Attack of the Cybermen (Stephen Haigh)
1984 Chess (ijk) (David Thompson)
1984 Green X Toad (Stephen Haigh)
1984 Cribbage (M. Jones & G. Privett)
1984 Dambuster (Pete Beckett Barbara Beckett, Chris Beckett)
1984 Don't Press the Letter Q (Andrew Moore)
1984 Draughts (David Thompson)
1984 Frigate Commander (Ashley Mills)
1984 Ghost Gobbler (Ian Hothersall)
1984 Super Fruit (Alan Readman)
1984 Trickshot (Stephen Haigh)
1984 Zebbie (J. Buckley)
1985 Damsel in Distress (Herman Zwaag & Marcel Van Driel)
1985 Gubbie (Alexander Aghassipour)
1985 Playground 21 (Mattias Gyllerup)
1985 Xenon III (WUN)

On Acorn BBC/Micro/Electron:
1982 3D Maxe
1982 Battle of Atlantis
1982 Beep-Beep
1982 Beepmunch
1982 BlackJack
1982 Breakout
1982 Flags
1982 Hangman
1982 Hyperdrive
1982 Invaders
1982 Leap Frog
1982 Mutant Breakout
1982 Patience
1982 Pontoon
1982 Stratobomber
1983 Star Soccer
1983 Casino - Roulette
1983 Caterpillar
1983 Five-A-Side Football
1983 Peg Leg
1986 Quest for Freedom
198x Caster Frankenstein

On ZX Spectrum:
1986 Big Bad John
1986 Crime Busters
1986 Mind Your Head
1986 One For The Road
1986 Mutations
1986 H.A.R.D (Heavy Armed Roboid Destroyer)
1986 Wizards Spell
1987 Colin the Cleaner
1987 Who Said That?

On Commodore 64:
1984 Jouste
1984 Krazy Kar
1985 Rocket Ball

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