Electrical computers and digital processing systems: processing – Instruction decoding – Decoding instruction to accommodate variable length...
Reexamination Certificate
1999-03-31
2001-05-08
Follansbee, John A. (Department: 2783)
Electrical computers and digital processing systems: processing
Instruction decoding
Decoding instruction to accommodate variable length...
C712S208000
Reexamination Certificate
active
06230256
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to data processing systems, and more specifically to computer processors capable of supporting 32 or 36 bit instructions installable and communicating using 64 bit industry standard busses and peripherals.
BACKGROUND OF THE INVENTION
There are millions of lines of code in existence that execute on proprietary hardware. For example, the assignee herewith sells GCOS® 8 hardware and software. GCOS® 8 is a proprietary system with a thirty-six (36) bit word size. Another proprietary thirty-six (36) bit system is the 1100/2200 systems sold by Unisys Corporation. A number of companies sell proprietary thirty-two (32) bit systems. As computer system design has evolved, the industry has settled on a byte size of 8-bits which most typically are contained in either thirty-two (32) bit or sixty-four (64) bit words.
The cost of continuously developing ever more powerful proprietary systems continues to increase. Part of the cost of developing follow-on proprietary systems is the cost of developing custom I/O interfaces and the like. Continuous development in this area is extremely expensive.
It would thus be advantageous to have a system where legacy code can be easily executed, while still being able to utilize industry standard components that utilize a different width byte or word.
REFERENCES:
patent: 5317720 (1994-05-01), Stamm et al.
patent: 5481689 (1996-01-01), Stamm et al.
patent: 5509137 (1996-04-01), Itomitsu et al.
patent: 5809320 (1998-09-01), Jain et al.
Bull HN Information Systems Inc.
Follansbee John A.
Hayden B. E.
Nguyen Dzung C.
Solakian J. S.
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