Electronic postage meter having redundant memory

Details Electronic postage meter having redundant memory Electronic postage meter having redundant memory

1988-11-25

1990-04-10

Shaw, Gareth D.

Boots, shoes, and leggings

36491852, 3649442, 36494492, 371 681, G06F 1520

Patent

active

049166239

ABSTRACT:
An electronic postal meter has an accounting unit with redundant nonvolatile random access memories controlled by a microprocessor system. The redundant random access memories have separate groups of address and data lines to minimize identical errors in data stored therein. The data transfer may occur at different times to and from the memories, with respect to any given byte of data. The system may incorporate redundant microprocessors, and critical parameters may be checked at periodic intervals in the main program of the accounting microprocessor system.

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Hackl et al., "Dynamic Allocation of High Availability Storage", IBM TDB, vol. 10, No. 10, Mar. 1968, pp. 1484-1485.
Chamoff et al., "Nonvolatile Totals Implementation", IBM TDB, vol. 20, No. 10, Mar. 1978, pp. 4071-4072.

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