PURPOSE: To bring the memory content to the state before the test, at the end of test, by performing the test for the function of alteration for the memory content of a terminal unit, through the provision of the test memory for the central processing unit.
CONSTITUTION: The terminal unit 101 delivers the date telling the start of test to the central unit 1 with the addition of the managing number in the memory 15, and the unit 1 returns the test permission data after memorizing and renewing the managing number of the memory 15 to the test memory 8. Next, in response to the request of the terminal unit, the test pattern data and the managing data predetermined are delivered, and the terminal unit memorizes 12 the test data and returns it to the output section 13, and it sends the managing number to the memory 15, allowing to check the memory renewal function. After the end of test, the memory content of the memory 8 is delivered with the request by the terminal unit, and this is renewed and memorized to the memory 15 and the content of the memory 15 is returned to the state before the test.
TSUBOI KATSUE
TOKITA TOSHIROU
MAEHARA TOMOHARU
KIKUTA SHIGEO
OOTANI AKIO
HITACHI LTD