Computer having a protection device to selectively block incorre

Details Computer having a protection device to selectively block incorre Computer having a protection device to selectively block incorre

1987-03-03

1989-10-17

James, Andrew J.

Boots, shoes, and leggings

371 12, 371 19, G06F 1100

Patent

active

048751561

ABSTRACT:
In a computer having a program including a first type of instruction and a second type of instruction, a program memory has a first area for storing the first type of instruction and a second area for storing the second type of instruction. An address code is supplied from a program counter to the program memory, which thereby produces an instruction code stored at the addressed memory location. A control unit is responsive to the instruction code from the program memory for producing a control signal for controlling the operation of the computer. A protection circuit is provided for preventing execution of the first type of instruction when the address code output from the program counter does not designate any memory location in the first area.

REFERENCES:
patent: 4566103 (1986-01-01), Sato et al.
patent: 4644539 (1987-02-01), Sato
patent: 4653018 (1987-03-01), Stadlmeier et al.
Shinjirou Toyoda, "Program Protecting Circuit", Patent Abstracts of Japan, vol. 7, No. 146, Jun. 25th, 1983.
Norio Tanaka, "Controlling Circuit of Program of Microcomputer", Patent Abstracts of Japan, vol. 5, No. 17, Jan. 31st, 1981.
Yukio Kobayashi, "Storage Protecting System of Control Storage", Patent Abstracts of Japan, vol. 9, No. 83, Apr. 12th, 1985.
Mutsuo Saitou; "Address Controlling System of Partially Mounted Control Memory", Patents Abstracts of Japan, vol. 7, No. 202, Sep. 7th, 1983.
Takeshi Nakatani; "Detection for Program Exception of Computer", Patent Abstracts of Japan, vol. 7, No. 286, Dec. 21st, 1983.
Mutsuo Saitou, "Microprogram Controller", Patent Abstracts of Japan, vol. 7, No. 210, Sep. 16th, 1983.

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