| 摘要 |
PROBLEM TO BE SOLVED: To diagnose whether or not each address bus is good with necessary irreducible main storage device constitution in a system where main storage devices are mounted scatteredly by assigning unmounted area addresses to the unused area divisionally several times and diagnosing whether or not the address bus of the unmounted area is good. SOLUTION: A diagnostic program recognizes an unused area 5b of a mounted area 5 and diagnoses whether or not the address bus of the unused area 5b is good. Then the unmounted area 6 is recognized, addresses of the unmounted area 6 are assigned to the unused area 5b divisionally several times, and the assigned address bus is diagnosed to diagnose whether or not the address bus of the unmounted area 6 is good. Then a diagnostic program loading position is moved to an arbitrary position in the unused area 5b and whether or not the address bus of the former diagnostic program loading area 5a is good is diagnosed. Consequently, whether or not all address buses are good can be diagnosed with the necessary irreducible constitution of the main storage device 4 which is >=2 times as large as the diagnostic program capacity. |
