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Comparing By Means Of Register Change

IP.com Disclosure Number: IPCOM000097268D
Original Publication Date: 1962-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Read, HL: AUTHOR

Abstract

A circuit is shown for sequence determination of two records.

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Comparing By Means Of Register Change

A circuit is shown for sequence determination of two records.

The digits of a record arrive at sequential digit times which progress from nine time to zero time within each record. At each digit time a single element of ten position register 10 is gated to be turned on, if the digit is present, or off, if the digit is not present, by advancing ring 12 output strobed by set pulses. The on output of the register elements are all connected through Or 14 to a high trigger
16. The off outputs are connected through a second Or 18 to low trigger 20. The high and low triggers are reset between each successive record. Their off outputs are connected through And 22 so that if both are off an equal condition is indicated by output 24 of And 22.

After a first record is stored in register 10, the next record is sequentially read into the register. The first register element to change state turns on the high trigger, if it changes from off to on and produces a high output on line 26. It turns on the low trigger, if the change is from on to off and produces a low output on line 28. In either case, the equal output drops and prevents further triggering of high or low triggers by lowering the two trigger gate inputs.

The same arrangement can be applied to binary coded decimal digits provided each digit arrives serially by bit high order first. In this case only four register elements would be required. Thus, the comparison of two records is m...