Postage meter with power-failure resistant memory

Details Postage meter with power-failure resistant memory Postage meter with power-failure resistant memory

1983-10-14

1986-01-14

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 1300, G06F 704

Patent

active

045649227

ABSTRACT:
A security system for a postage meter includes two memories, one of which is an electronically programmable READ-ONLY memory having non-volatile storage, while the second memory is a shadow RAM which is a composite memory having a first section composed of a volatile RAM and a second section composed of non-volatile storage. During a power outage, a computer strobes the second memory to transfer data from the volatile section to the non-volatile section. Upon restoration of the power, a transfer circuit which includes a detector of the incoming power directs the transfer of at least a portion of the stored data in each of the memories to the computer for a comparison to determine if any data has been altered by the loss of power.

REFERENCES:
patent: 4169288 (1979-09-01), Fairman et al.
patent: 4218764 (1980-08-01), Furata et al.
patent: 4247918 (1981-01-01), Iwahashi et al.
patent: 4279024 (1981-07-01), Schrenk
patent: 4285050 (1981-08-01), Muller
patent: 4306299 (1981-12-01), Check, Jr. et al.
patent: 4327410 (1982-04-01), Patel et al.
patent: 4484307 (1984-11-01), Quatse et al.

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