Data processing apparatus having binary multiplication capabilit

Details Data processing apparatus having binary multiplication capabilit Data processing apparatus having binary multiplication capabilit

1985-01-17

1987-08-04

Malzahn, David H.

Boots, shoes, and leggings

G06F 752

Patent

active

046850775

ABSTRACT:
There is described a data processing apparatus with a binary multiplication capability. The apparatus has an arithmetic and logic unit (ALU) and a operand register. The operand register is divided into two portions, the first of which can be shifted while the second is loaded in parallel. For multiplication, the first portion is used to hold a multiplier and to receive the least significant bits of the result, while the second portion receives the most significant bits of the result. The invention avoids the need for a separate shift register to hold the multiplier. The described apparatus also has a look-ahead facility, for selecting the next bit of the multiplier ahead of its requirement, so that it is immediately available when required.

REFERENCES:
patent: 3761699 (1973-09-01), Sather
patent: 4228518 (1980-10-01), Chamberlin
patent: 4589086 (1986-05-01), Beifuss et al.

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