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IP.com Disclosure Number: IPCOM000093094D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

McDonald, JF: AUTHOR [+2]

Abstract

The system makes dual use of counting circuits for locating blocks of data recorded on magnetic tape and counting or searching individual lines of data identified by Carrier Return codes. Printer 1 has print head 2 for printing characters on documents such as 3a and 3b. Characters are entered through keyboard 4. Printer 1 is connected with tape unit 6 having tape record-playback stations 7 and 8. Data passes through tape circuits 9 or 10 and relay register 18.

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Line Count and Search

The system makes dual use of counting circuits for locating blocks of data recorded on magnetic tape and counting or searching individual lines of data identified by Carrier Return codes. Printer 1 has print head 2 for printing characters on documents such as 3a and 3b. Characters are entered through keyboard 4. Printer 1 is connected with tape unit 6 having tape record-playback stations 7 and 8. Data passes through tape circuits 9 or 10 and relay register 18.

Modes, including Search Block and Search Line, are established by circuit 12 by setting dial 11. To locate a data block, the number of the desired block is entered and directed to comparator 31 by setting dial 14. The selected block is indicated by a number in window 15, for example, any of blocks 1...73. Depressing a block search button on control keyboard 13 initiates a high-speed search. During such search, reference codes on line 28 are applied to counter control 37 to step counter 16 by line 29. Counter 16 is compared with the block required and a Block Located signal on line 23 stops the search. This can occur, as for example, at point A on document 3a.

The counter circuits now serve a dual use to locate a desired line of information in the block, as at point B on document 3a. The line required is set by dial 14 and indicated by window 15. Data is read from a selected tape. Carrier Return codes on line 36 step counter 16 which is compared by line 30 with the line setting of dial...