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Pulse Generator for Multiplication

IP.com Disclosure Number: IPCOM000098666D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Lee, TL: AUTHOR [+3]

Abstract

The upper drawing illustrates a five stage ring counter 10 employing magnetic core shift circuits of the one-core-per-bit type, arranged for decimal counting. Successive advance pulses applied to the advance circuit 11 produce the conditions shown in the counting sequence chart at the left, by entering into core A the inverse of the information obtained from core E and shifting it through the ring. With the arrangement shown, each core is switched and reset five times during one complete counting cycle. If output lines a, b, c, d and e are provided between the several stages, a number of output pulses, five on each line, are obtained at various times during the cycle.

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Pulse Generator for Multiplication

The upper drawing illustrates a five stage ring counter 10 employing magnetic core shift circuits of the one-core-per-bit type, arranged for decimal counting. Successive advance pulses applied to the advance circuit 11 produce the conditions shown in the counting sequence chart at the left, by entering into core A the inverse of the information obtained from core E and shifting it through the ring. With the arrangement shown, each core is switched and reset five times during one complete counting cycle. If output lines a, b, c, d and e are provided between the several stages, a number of output pulses, five on each line, are obtained at various times during the cycle. By combining the pulses available on lines a-e in various logical combinations, any desired number of outputs from zero to nine are obtained during a counting cycle.

The upper drawing includes a switching arrangement by which the lines a-e are connected to a set winding 12 and an inhibit winding 13 of an output producing core 14 to provide certain logical combinations. If the ganged switches 15 and 16 are set to position 6, for example, lines a and b are coupled to the set winding 12 of core 14 producing the logical combination a or b. The core 14 is set six times during a counting cycle. A reset winding 17, coupled to the advance circuit 11 of ring 10, resets core 14 after each setting pulse, producing six outputs at terminals 18. If the switches 15 and 16 are set to position 4, line a is connected to set winding 12 and line e is connected to inhibit winding 13, providing the logical combination a and not b to produce four pulses at terminals 18 during a cycle of operation.

To use the circuit (upper drawing) for multiplication, the switches 15 and 16 are set to a position representing the value of the multiplicand, and the ring 10 is cycled a number of times equal to the value of the multiplier. The number of pulses obtained at the terminals 18 represents the product. For example, the product of 3 x 7 is obtained by setting switches 15 and 16 at position 7 and driving the ring 10 through three complete cycles to produce twenty-one pulses at terminals 18.

A...