© The Institution of Electronic and Radio Engineers
An optical fixed data storage system is described which is designed to hold 4 M bits of information on each exchangeable photographic plate. The store, intended as an integral part of a computing system, enables any of 65,536 69-bit words to be retrieved with a random access time of a few microseconds. Writing time for each data plate is approximately 1 hour. To record and retrieve the data, a spot is positioned on the face of a high resolution electrostatic cathode ray tube, and multi-imaged on to a photographic plate by means of a lens/square cross-section mirror tunnel/lens system. Word readout is achieved using one 11-stage photomultiplier as detector for each bit of the word.
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Krolak, L. J. and Parker, D. J., ‘The Optical Tunnel, a Versatile Electro-Optical Tool’, Applied Research D.E.P.,Camden, N. J..
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A.N. Hill ,
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Servo system for cr.t. lightspot positioning.
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Bowden, K.R.R.: `Random access photographic data storage', Proc. Scientific Instrument Research Assoc. Conference Eastbourne, 1968, Chislehurst, Kent,B.S.I.R.A., p. 6–1–6–8.
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R.J. Botfield ,
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A random access optical fixed store.
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811
http://iet.metastore.ingenta.com/content/journals/10.1049/ree.1970.0020
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