Program protection in a programmable electronic calculator

Details Program protection in a programmable electronic calculator Program protection in a programmable electronic calculator

1982-11-02

1989-02-14

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 1214

Patent

active

048051365

ABSTRACT:
A programmable electronic calculator operates in a programming mode, wherein a desired optional program is introduced into the programmable electronic calculator, or in a run mode wherein the stored program is executed. The introduced optional program is stored in a read/write memory (RAM). A mode selection switch is provided on a keyboard for selectively placing the programmable electronic calculator in the run mode or the programming mode. When a lock command is introduced through the keyboard, the mode selection switch is disabled so that the programmable electronic calculator will not be placed in the programming mode, thereby protecting the optional program stored in the read/write memory (RAM) from being unintentionally erased.

REFERENCES:
patent: 3855461 (1974-12-01), Stockwell
patent: 4012725 (1977-03-01), Spangler et al.
patent: 4118789 (1978-10-01), Casto et al.
patent: 4245308 (1981-01-01), Hirschman et al.
patent: 4366553 (1982-12-01), Spangler et al.

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