Call-unit count device

Details Call-unit count device Call-unit count device

1997-03-10

1999-12-21

Hajec, Donald

Registers

Systems controlled by data bearing records

Credit or identification card systems

235375, 235376, 235379, 235382, G06K 500

Patent

active

060037687

ABSTRACT:
A call-unit count device according to the present invention comprises a memory circuit having a high-order level and a low-order level composed of n (n: integer greater than or equal to 2) bits and wherein all the bits each indicative of the initial value and placed in the low-order level are changed to reversed values bit by bit each time a one call-unit add command is given, all the bits in the low-order level, which have been brought to the reversed values, are returned to the initial value bit by bit each time the one call-unit add command is given, and values stored in the high-order level are changed upon a carry from the low-order level to the high-order level.

REFERENCES:
patent: 4530108 (1985-07-01), Wilmsmeyer
patent: 4829169 (1989-05-01), Watanabe
patent: 4853526 (1989-08-01), Effing
patent: 5089959 (1992-02-01), Hazard
patent: 5285415 (1994-02-01), Depret et al.

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