DATA ASSURING SYSTEM

• Main Authors: SAKANO HIROAKI, YOSHIDA MITSURU
• Format: Patent
• Language: English
• Published: 14.03.1989
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PURPOSE:To reduce memory capacity by storing the latest check sum data on subject data in a memory and comparing this check sum data with the binary addition value of the subject data. CONSTITUTION:The value obtained by applying binary addition to latest data in a data memory area is held by giving the binary addition or subtraction to the value of a check sum memory area 2 for each change of the data on a data memory area 1 and in accordance with said data change value. Then the binary addition is applied periodically to the data in the area 1 as necessary. The result of this binary addition is compared with the data stored in the area 2. Then the destruction of the data in the area 1 is decided and an alarm is produced in case no coincidence is obtained from said comparison. Thus it is possible to avoid a malfunction due to the use of the wrong data in a small capacity memory area with no data held overlapping with each other.