Recording data in a card memory

摘要

A consumed amount is recorded on a card having two recording areas. The first recording area consists of plurality of record bits (a to j) which are unchangeable when marked. The second recording area consists of a changeable memory (M). More significant digits of the consumed amount are recorded in the first recording area and less significant digits of the consumed amount are recorded in the second recording area. When a further amount is to be recorded the second recording area is read and the data therefrom combined with a further amount before recording.