Method of storing a consumed amount in a card memory

Details Method of storing a consumed amount in a card memory Method of storing a consumed amount in a card memory

1988-12-14

1990-10-16

Levy, Stuart S.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235487, 235381, 369 14, G06K 112, G06K 1908

Patent

active

049637223

ABSTRACT:
A new data recording method is provided in which a consumed amount of predetermined value is recorded in a card memory. Two recording areas are provided in a card memory. The first recording area consists of a plurality of record bits (a through j) which are unchangeable when marked. The second recording area consists of a changeable memory (M). Upper digits of the consumed amount are recorded in the first recording area so as to improve the factor of safety and lower digits of the consumed amount are recorded in the second recording area so as to improve the factor of freedom.

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