Central processing unit for executing instructions of variable l

Details Central processing unit for executing instructions of variable l Central processing unit for executing instructions of variable l

1982-08-17

1985-07-16

Thomas, James D.

Boots, shoes, and leggings

G06F 936

Patent

active

045300500

ABSTRACT:
A central processing unit for executing instructions of variable length in which an operand specifier for specifying the addressing mode of an operand is independent of an operation code for ascertaining the kind of an operation and the number of operands. Each operand specifier is formed of one or more data bytes, and has a stop bit flag indicating whether or not the particular operand specifier is the last operand specifier. By adding the stop bit flag, the operand specifier can be shared, and different processing can be executed with an identical operation code. In a case where, when operation code decoding means has provided an output indicative of the last operand, the stop bit flat is not detected in the corresponding operand specifier, the corresponding instruction is detected as an error.

REFERENCES:
patent: 3344404 (1967-09-01), Curewitz
patent: 3377620 (1968-04-01), Sims, Jr.
patent: 4109310 (1978-08-01), England et al.
patent: 4236206 (1980-11-01), Strecker et al.
patent: 4241397 (1980-12-01), Strecker et al.
patent: 4241399 (1980-12-01), Strecker et al.
"B1700 COBOL/RPG-S Language", Pub. No. 1058823-015, Copyright 1973, Burroughs Corporation, pp. 156-175.
"VAX-11 Architecture Handbook", Digital Equipment Corp., Copyright 1979, pp. 79-117.
"A Guide to the IBM System/370 Model 168", pp. 26-29.

Affiliated with

Also associated with

Rating

Central processing unit for executing instructions of variable l does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Central processing unit for executing instructions of variable l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Central processing unit for executing instructions of variable l will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1739127