MEMORY CARD APPARATUS USING EEPROMS FOR STORING DATA AND AN INTERFACE BUFFER FOR BUFFERING DATA TRANSFER BETWEEN THE EEPROMS AND ANEXTERNAL DEVICE.

摘要

PURPOSE:To enable the continuous use of an electrically erasable and programmable ROM (EEPROM) in one part of which a write error occurs and to make practical and economical use of it by performing a measurement to relieve the write error. CONSTITUTION:The memory card is provided with an EEPROM 16 having data area consisting in blocks each of them has the constant capacity and a relief area and a control means 14 writing data to be written in an erroneous block by retrieving an idle block in the relief area while detecting a write error in the block of the data area in this EEPROM 16.