Method and apparatus for packed BCD sign arithmetic employing a

Details Method and apparatus for packed BCD sign arithmetic employing a Method and apparatus for packed BCD sign arithmetic employing a

1974-11-27

1976-02-10

Dildine, Jr., R. Stephen

Registers

Transfer mechanism

Traveling pawl

G06F 7385

Patent

active

039379418

ABSTRACT:
Disclosed is a BCD arithmetic method and BCD arithmetic apparatus for use in a data processing system. The binary adder included in a data system for binary arithmetic operations is additionally utilized in the invention to provide BCD sign-magnitude addition and subtraction of packed digits. The apparatus is utilized to carry out the method steps of preconditioning one of the operands by adding a predetermined binary number to each BCD digit, performing a binary addition, and applying a decimal adjust to form the decimal arithmetic sum. Subtraction steps include performing a two's complement binary subtraction of each BCD digit, and applying a decimal adjust to form the decimal difference. The method and apparatus may be utilized with other base number systems having members which may be represented by a binary sequence that does not use all of the 2.sup.N binary combinations in the set.

REFERENCES:
patent: 3304418 (1967-02-01), Perotto et al.

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