Cartridge memory protection

Details Cartridge memory protection Cartridge memory protection

1985-01-14

1986-08-19

Popek, Joseph A.

Static information storage and retrieval

Powering

Data preservation

307 66, 365229, G11C 500

Patent

active

046073515

ABSTRACT:
Cartridge (1) contains memory (40a-40h) and a back-up battery (13). Terminals (5a-5i) of the cartridge (1) plug into termnals (7a-7i) of a host machine (3). Positive deactivation of the write control is achieved by both the base and emitter of a bipolar transistor (52) being deactivated when the cartridge (1) is unplugged. Battery voltage then appears at read/write control line (64) through resistor (56) connected to the collector of the transistor (52). This brings the control line (64) to the read status and positively protects data in memory (40a-40h) against transient signals, which may occur especially during plug in when the host (3) is activated, or from electrostatic charges.

REFERENCES:
patent: 3859638 (1975-01-01), Hume, Jr.
patent: 4229804 (1980-10-01), Kolyashi et al.
patent: 4383184 (1983-05-01), McFarland
patent: 4445198 (1984-04-01), Eckert
patent: 4485456 (1984-11-01), Toyoda
IBM Technical Disclosure Bulletin, vol. 15, No. 11, Apr. 1973, entitled "Pluggable Storage Modules," by H. D. Atkinson et al., at pp. 3408-3409.
IBM Technical Disclosure Bulletin, vol. 14, No. 9, Feb. 1972, entitled "Volatile Memory Data Retention," by R. D. Anderson et al., at pp. 2712-2713.

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