Method and apparatus for controlling usage of a programmable com

Details Method and apparatus for controlling usage of a programmable com Method and apparatus for controlling usage of a programmable com

1978-09-14

1981-01-20

Atkinson, Charles E.

Boots, shoes, and leggings

371 72, G06F 1300, H04K 100

Patent

active

042466385

ABSTRACT:
A method for controlling usage of a programmable computing machine which operates in accordance with uncoded or published machine language operation codes including uniquely encoding the uncoded operation codes of instructions of a program to be used on the computing machine as a function of location of the instructions in memory and as a function of machine state, and adding to the machine a decoder that decodes only the uniquely encoded operation codes. Apparatus for controlling usage of a programmable computing machine which operates in response to uncoded or published machine language operation codes including memories which store machine user created programs and operating system programs, in which each program has instructions with uncoded and encoded operation codes, decoders to decode the encoded operation codes of the instructions of the user created program and the encoded operation codes of the instructions of the operating system program, and a circuit to execute the instructions of the user created program and the operating system program having the decoded and the uncoded operation codes.

REFERENCES:
patent: 3609697 (1971-09-01), Blevins et al.
patent: 3889242 (1975-06-01), Malmer, Jr.
patent: 3962539 (1976-06-01), Ehrsam et al.
patent: 4037214 (1977-07-01), Birney et al.
patent: 4120030 (1978-10-01), Johnstone
patent: 4168396 (1979-09-01), Best

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