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Addressing Magnetic Tapes

IP.com Disclosure Number: IPCOM000097155D
Original Publication Date: 1962-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Beurel, J: AUTHOR

Abstract

The addressing of magnetic tape areas is realized by means of perforations or optical marks provided on the tape and sensed by photoelectric cells. This allows addressing the tape by having it advanced at a much greater speed than used previously for the readout of magnetic marks. The process requires special preparation of the tapes. Moreover, it does not allow convenient modification of the correspondence between the areas and the addresses defining them.

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Addressing Magnetic Tapes

The addressing of magnetic tape areas is realized by means of perforations or optical marks provided on the tape and sensed by photoelectric cells. This allows addressing the tape by having it advanced at a much greater speed than used previously for the readout of magnetic marks. The process requires special preparation of the tapes. Moreover, it does not allow convenient modification of the correspondence between the areas and the addresses defining them.

In this arrangement, addresses are recorded not on the magnetic tape itself but on a non-magnetic tape synchronized with the magnetic tape. Magnetic tape 1 bears the information, and address tape 2 bears addresses made of optical marks 3. The tapes bear rows of sprocket holes 4 for driving them by two sprockets 5, 6 mounted on common axle 7.

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