EPM having an improvement in accounting update security

Details EPM having an improvement in accounting update security EPM having an improvement in accounting update security

1988-12-30

1991-06-04

Lall, Parshotam S.

Boots, shoes, and leggings

371 13, 371 161, G07B 1700

Patent

active

050219634

ABSTRACT:
An electronic postage meter has two non-volatile memories for storing postage meter accounting data under control of a CPU operating under a program in ROM. An accounting data recovery routine is stored in ROM. Prior to updating critical information in the non-valatile memories, a recovery address which calls the recovery program is stored in NVM and cleared after a successful update. At each power-up of the meter, the non-volatile memory is checked to see if the address is present and if it is, the accounting data is done again from the start of the accounting cycle.

REFERENCES:
patent: 3321747 (1967-05-01), Adamson
patent: 4713769 (1987-12-01), Hills et al.
patent: 4747057 (1988-03-01), DiGuiulio et al.
patent: 4785417 (1988-11-01), Obrea
patent: 4812994 (1989-03-01), Taylor et al.
patent: 4814971 (1989-03-01), Thatte
patent: 4916623 (1990-04-01), Check, Jr.

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