Circuit arrangement for adding and subtracting

Details Circuit arrangement for adding and subtracting Circuit arrangement for adding and subtracting

1975-12-11

1977-03-01

Smith, Jerry

Registers

Transfer mechanism

Traveling pawl

G06F 750

Patent

active

040103595

ABSTRACT:
A circuit arrangement for selectively adding or subtracting two binary coded decimal numbers exclusively by means of addition operations, in which addition involves adding a binary coded decimal value corresponding to the decimal value "6" to each digit of one of the numbers to be added and adding a binary coded decimal value corresponding to the decimal value "10" when the addition of corresponding digits of the two numbers and the value "6" does not produce a carry, and in which subtraction involves forming the unit complement to each digit of the subtrahend, adding together the unit complement of each digit, to the corresponding digit of the minuend, and a value of "1", and then adding the binary coded decimal value corresponding to the decimal value "10" when the previous addition does not produce a carry.

REFERENCES:
patent: 2989237 (1961-06-01), Duke
patent: 2991009 (1961-07-01), Edwards
patent: 3089644 (1963-05-01), Wensley
patent: 3189735 (1965-06-01), Gunderson et al.
patent: 3304418 (1967-02-01), Perotto et al.
patent: 3339064 (1967-08-01), Koizumi et al.
patent: 3935438 (1976-01-01), Grupe

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