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flip all of the bits in that loop, and then used the twistor wires as the read line.

Twistor memory was thus read and written one plane at a time, rather than in core memory, where only one bit per plane could be used at once.

Permanent magnet twistor

Twistors could be modified to produce a ROM that could be easily re-programmed. To do this, one-half of each solenoid loop was replaced with an aluminum card into which tiny vicalloy bar magnets were embedded. As the solenoids have to be

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