STORING METHOD FOR TELEPHONE NUMBER

摘要

PURPOSE:To detect a wrong telephone number by storing the telephone number in a random access memory together with a parity and performing the periodical parity check to erase the relevant telephone number when a parity error is detected. CONSTITUTION:A microprocessor 3 reads out a telephone number and a horizontal even parity LRC out of a memory area A per minute to perform the parity check. Then the processor 3 erases the contents of the area A if a parity error is detected. Then the processor 3 performs the parity check of a telephone number stored in a memory area B and transfers it as a new number of the area A as long as no error is detected. Thus the correct telephone numbers are always written to both areas A and B. While the processor 3 erases the contents of both areas A and B in case errors are detected with telephone numbers of both areas A and B. The erasion of these contents is shown with blinking of a display part 5.