Computer memory addressing employing base and index registers

Details Computer memory addressing employing base and index registers Computer memory addressing employing base and index registers

1974-12-09

1976-04-06

Zache, Raulfe B.

Communications: electrical

Digital comparator systems

G06F 1300

Patent

active

039493784

ABSTRACT:
A memory addressing system which enables a computer to address a total of 048,575 words (32 times its original capacity) with minimal impact upon existing software. The method employed by this invention involves a new dual usage of the b (index) designator in each instruction word so that in addition to its normal function of specifying which of 8 index registers is to be added to the address portion of the instruction, it also specifies which of 8 base registers is to be arithmetically added to the basic 15-bit address to determine the final 20-bit absolute memory location address. A total of 262,144 words may be accessed by this dual use of the b designator for any one setting of the base registers. Each program module is designed to operate in a 32,768 word environment and no coding changes need be made to it; the computer operator need only maintain the appropriate offset values in the base registers for the module currently in operation.

REFERENCES:
patent: 3287703 (1966-11-01), Slotnick
patent: 3389380 (1968-06-01), Ashbaugh
patent: 3401376 (1968-09-01), Barnes
patent: 3461434 (1969-08-01), Barton
patent: 3657705 (1972-04-01), Mekota, Jr.
patent: 3699528 (1972-10-01), Carlson
patent: 3787813 (1974-01-01), Cole

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