Variable field length addressing system having data byte interch

Details Variable field length addressing system having data byte interch Variable field length addressing system having data byte interch

1973-08-06

1978-08-22

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 912, G06F 1300

Patent

active

041093100

ABSTRACT:
A microprogrammable computer system including a central processing unit having a main memory storing data and a microprogrammed control memory consisting of a plurality of read-only memory chips containing microprograms, provides for various variable field addressing, multi-way branching, push-down stack and byte string operations that share common instructions and hardware. Using the system, a contiguous set of bits may be accessed or stored in the main memory without regard to memory word boundaries, the number of bits in the set, or the location of the bits in a memory word. The variable field addressing features are based upon the use of two types of instruction words, viz., field addressing instructions and field descriptors, which extract the appropriate bits from main memory and process them according to the instructions specified. The system includes byte swapping circuitry such that during a single microinstruction subroutine execution cycle, portions of a fixed length data word in a register may be interchanged.

REFERENCES:
patent: 3077580 (1963-02-01), Underwood
patent: 3166668 (1965-01-01), Marsh
patent: 3238508 (1966-03-01), Kelley
patent: 3331056 (1967-07-01), Lethin et al.
patent: 3496550 (1970-02-01), Schachner
patent: 3735355 (1973-05-01), Balogh, Jr.
patent: 3739352 (1973-06-01), Packard

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