Redundant memory for point of sale system

Details Redundant memory for point of sale system Redundant memory for point of sale system

1977-04-26

1979-09-25

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 1100, G06F 1104

Patent

active

041692888

ABSTRACT:
A point of sale system having an active and a spare data processing system, each including separate read/write memories, with only one of the systems being active at a given time, but with the active system being able to selectively acquire data from the read/write memory of the spare system upon start-up and including means for verifying which read/write memory of the active or the spare system contains valid, most current data which is then transferred to whichever system is the active system, the read/write memories of each of the two systems having a built-in generation number counter which is incremented by one whenever either the data of the inactive read/write memory is caused to be transferred to the active read/write memory or whenever the counts in the generation number counters of both read/write memories are equal, this change in the generation number counters taking place only at the start-up of the system.

REFERENCES:
patent: 3377623 (1968-04-01), Reut et al.
patent: 3636331 (1972-01-01), Amrehn
patent: 3864670 (1975-02-01), Inoue et al.
patent: 3866182 (1975-02-01), Yamada et al.
patent: 3882455 (1975-05-01), Heck et al.
patent: 3898621 (1975-08-01), Zelinski et al.
patent: 3921141 (1975-11-01), Wilber et al.
patent: 3946220 (1976-03-01), Brobeck et al.
patent: 4032899 (1977-06-01), Jenny et al.

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