Apparatus for power-on data integrity check of inputted characters stored in volatile memory

摘要

A memory data coincidence device includes a volatile read write memory connected to a main power source and auxiliary backup power source, and a keyboard for supplying data to the read write memory. The device further includes a read only memory for storing all data capable of being stored in the read write memory and a central processor unit (CPU) which compares the data of the read write memory with all data of the read only memory before it reads data out of the read write memory. If no coincidence takes place, the CPU sends forth a signal denoting the condition that the read write memory is not backed up.