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Count Storage Circuit

IP.com Disclosure Number: IPCOM000095481D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Terlet, RH: AUTHOR

Abstract

The count storage circuit stores a count of incoming serial input pulses. It counts down as well as up. Neon lamps 10, 12, 14 and 16 are each optically coupled to a number of photoconductors 10-2, 10-3, 12-1, 12-2, 12-3, 12-4, etc.

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Count Storage Circuit

The count storage circuit stores a count of incoming serial input pulses. It counts down as well as up. Neon lamps 10, 12, 14 and 16 are each optically coupled to a number of photoconductors 10-2, 10-3, 12-1, 12-2, 12-3, 12-4, etc.

Pulses to be added to the existing count are applied at 18 and cause neon 10 to strike and illuminate photoconductors 10-2 and 10-3. Photoconductor 10-2 is a latching photoconductor which serves, at the termination of an input pulse, to keep neon 10 on. Photoconductors 12-2, 14-2 and 16-2 are also latching types. Illumination of 10-3 connects neon 10 to power terminal 26 so that as neon 12 strikes photoconductors 12-1, 12-2, 12-3 and 12-4 are illuminated. Illumination of 12-1 grounds and extinguishes neon 10, 12-2 maintains supply voltage to neon 12 from terminal 26 and 12-3 connects power terminal 28 to the next neon 14.

Similarly neon 14 illuminates 14-3 to connect neon 16 to power terminal 30 and so illuminates 16-1 to cut off neon 14. Thus, after the first input pulse, neon 16 is latched on and the. remaining neons are off.

Another pulse cannot progress further than neon 12, since neon 14 is grounded by photoconductor 16-1 so that a two-pulse count is shown by illumination of both neon 16 and neon 12. Output photoconductors 12-4 and 16- 4 connect to output terminals to indicate the count stored by the circuit.

The count-down input 22 is connected to a further neon 20 arranged to illuminate photoconductor 20-1....