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Technical Abilities
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Predictive ability
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Drawing information from other computers Orac could make predictions. In Orac it predicted the Liberator's destruction at astro point 781.
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Able to take control of other computer systems and interfere with them
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In Redemption when 'The System' attempted to reclaim the Liberator the sister ship, DSV-1, pursued Liberator but Orac was able to scramble the missile launch systems using carrier waves. Orac also tookover the computers of 'The System' and used this ability to destroy DSV-1. In Dawn of The Gods Orac assumed control of Zen to study a black hole into which it supposed the ship had been pulled In Aftermath Orac assumed control of Avon's life capsule as it entered the atmosphere of Sarran too fast.
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Capacity to operate other equipment
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Orac operated the teleport in Shadow, it's signals also passed through the same dimension as
Cally's telepathy, though Orac itself was not telepathic.
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Could deliver an electical discharge to objects in close proximity
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Happened to Hanna in Shadow.
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Could reduce physical size
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Gambit saw Orac reduce itself, using stabilized atomic implosion, to one eighth normal size for two hours and six minutes. It was implied that the length of time it could reduce itself for was inversely proportional to the degree of reduction.
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Carrier beam facility
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Jenna used Orac's carrier beam to warn Space Command of the impending alien invasion in Star One. This was reportedly the fastest way to contact Servalan.
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Ablity to analyse objects
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When a sensory device was attached to Orac in Sarcophagus it was able to study the alien artefact brought back to the ship by Cally.
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Transmission interception and modification
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In Ultraworld Orac reflected the Core's wave emissions back to the Core destabilising it.
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Delegation of orders
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Orac was able to delegate orders given by Avon to other computers, Traitor.
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Simulation of transmission signals
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The episode Blake saw Orac simulate two signals on Gauda Prime. The first was a distress beacon to attract passing bounty hunters and to allow Avon to acquire their transport. The second was to imitate one of Blake's fliers and allow the crew to enter a landing silo in Blake's headquarters.
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Technical Problems
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Could be taken over in certain situations
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This occurred in Shadow where it was taken over by the Darkness and then again in Headhunter where in came under the influence of Mullers android.
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Susceptible to electrical interference
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This occurred above Virn
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Easily damaged by explosions and direct impacts
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Explosions were arranged by Servalan in Rescue and direct impacts occurred in Warlord when it was hit by a girder brought down by explosives planted by Finn.
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Personality
 Although a technological marvel Orac proved to be a handful for Blake and his crew.
The machine had absorbed the irritable characteristics of Ensor, it's creator , especially his vanity. It had a snappy voice and was often impatient with anyone
unfortunate enough to ask it a question. It also showed little concern for the rest of the crew who it regarded with scorn. In short, Orac would much rather spend time
contemplating the mysteries of the universe than spending time with mere mortals.
Orac was voiced by Peter Tuddenham.
First Contact
 Orac was first encountered in the episode aptly titled Orac. Servalan had learnt the
location of Orac and was willing to pay 100 million credits for it, telling Travis it was worth "ten times that much". Blake and his crew embark on a life-saving misson to
Aristo to prevent the machine from falling into Federation hands. Servalan and Travis race to seize the prize only to be beaten at the last moment by Blake who captures it for
himself and, more importantly, keeps it out of Federation hands.
The End
 The last time Orac was seen was in the final episode, Blake. It was in the flier acquired
by the crew as they made their way to Blake's headquarters. The crew were next seen in the tracking gallery of this installation and Orac was not with them.
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