Apparatus and method for operand fetch control

Details Apparatus and method for operand fetch control Apparatus and method for operand fetch control

1979-06-04

1982-03-16

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 934

Patent

active

043204546

ABSTRACT:
An operand fetch control system wherein an address modification mode code is provided in the instruction word and designates both the general storage location of an operand to be fetched and the mode of addressing required for fetching it. The address modification mode code is a two-bit binary number designating either a direct register addressing mode or a main memory indirect, index, or indirect index addressing mode. Mode code 00 designates the register mode while the codes 10, 01 and 11 designate the indirect mode, the index mode and the indirect index mode, respectively.

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patent: 3972025 (1976-07-01), Taddei
patent: 3976976 (1976-08-01), Khosharian
patent: 4117536 (1978-09-01), Bodner

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