Program storage hardware with security scheme

Details Program storage hardware with security scheme Program storage hardware with security scheme

1983-01-05

1985-05-21

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 100

Patent

active

045190364

ABSTRACT:
A computer generally includes a program storage device for storage in memory of program or other information. The software or program may be expensive to produce yet can be copied without undue difficulty from the storage device.
This invention provides a program storage device which does not output an address, as part of an instruction, if it is an address within the device. The data output from a programmable read only memory (PROM) is output to a data modifier where in response to a controller it is changed to a dummy address for output. Information to reconstitute the address is held in a stack then when the dummy address returns the controller causes an offset adder to return the original address. Steps can be taken to deal appropriately with conditional instructions and relative instructions.

REFERENCES:
patent: 4139893 (1979-02-01), Poland

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