Programmable calculator with external memory module and protecti

Details Programmable calculator with external memory module and protecti Programmable calculator with external memory module and protecti

1985-05-22

1989-01-03

Harkcom, Gary V.

Boots, shoes, and leggings

364900, G06F 1502

Patent

active

047962151

ABSTRACT:
A programmable calculator using at least one exchangeable reloadable memory module includes a connector for connecting the exchangeable reloadable memory module to the calculator. The calculator judges whether a program including information to execute said program is present in said exchangeable reloadable memory module, and inhibits erasure of the information to execute the program when presence of the program in the exchangeable reloadable memory module is judged by the calculator at the time of initialization of the programmable calculator.

REFERENCES:
patent: 3971925 (1976-07-01), Wenninger et al.
patent: 4012725 (1977-03-01), Spangler et al.
patent: 4063221 (1977-12-01), Watson et al.
patent: 4075679 (1978-02-01), Christopher et al.
patent: 4091446 (1978-05-01), Demonte et al.
patent: 4126898 (1978-11-01), Spangler et al.
patent: 4153937 (1979-05-01), Poland
patent: 4636970 (1987-01-01), Morino et al.

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