Apparatus for safeguarding data entered into a microprocessor

Details Apparatus for safeguarding data entered into a microprocessor Apparatus for safeguarding data entered into a microprocessor

1981-07-07

1984-02-07

Smith, Jerry

Boots, shoes, and leggings

G06F 700

Patent

active

044307098

ABSTRACT:
For any given program entered into an EPROM in a microprocessor, read-out from certain storage locations or cells in the EPROM is prevented by transmission gates connected into externally accessible data lines. Transmission through the transmission gates is blocked by the arithmetic unit when a blocking command is present in one or more cells of the EPROM. These commands are only entered into the EPROM after all information required for the program is stored in the latter and, if necessary, the unit has been tested for proper operation. When the program is erased, the blocking commands are also erased so that the chip is available for another application.

REFERENCES:
patent: 4183085 (1980-01-01), Roberts et al.
patent: 4268911 (1981-05-01), Bell
patent: 4298934 (1981-11-01), Fischer
patent: 4332009 (1982-05-01), Gerson
Gibson; G. A., Liu; Y., Microcomputers for Engineers and Scientists, Prentice-Hall, Inc., 1980.
Abd-alla; A. M., Meltzer; A. C., Principles of Digital Computer Design, Prentice-Hall, 1976.

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