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Computer Tape Skew Adjustment

IP.com Disclosure Number: IPCOM000073994D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Southworth, RA: AUTHOR

Abstract

Data is arranged on a standard computer tape with each character recorded in seven or nine parallel tracks. Because of mechanical and electrical tolerances the bits may not be read at the same time.

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Computer Tape Skew Adjustment

Data is arranged on a standard computer tape with each character recorded in seven or nine parallel tracks. Because of mechanical and electrical tolerances the bits may not be read at the same time.

To adjust the output from a tape an oscilloscope is normally used to compare the tracks two at a time to find the most lagging track signal. Then each of the other track signals is compared against the most lagging track signal and a proper amount of delay inserted to align the signals in time.

Shown is a circuit which accomplishes the above detection which does not require an oscilloscope. Two tracks are selected; one in each channel. The track whose signal occurs later will cause its channel light to burn. Delay is inserted and when the two channels are lined up, the inherent slight flutter in the system causes both lights to flicker rapidly.

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