Abstract
This paper describes the Automatic Preventive Maintenance (APM) Program used on the hybrid computer system installed in 1967 at Lockheed Missiles and Space Company, Sunnyvale, California. This is one of the largest hybrid computer systems in the world. It has a multi-processor digital computer (CDC 6400) with five remote entry display units (CDC 211), 32K core storage, and a large storage disc. Because of these capabilities the APM program has many unique operating features. The size and the cost of the equipment make it imperative to keep downtime to a minimum. To do this the system is subjected to many layers of manual and automatic checks. This paper will concentrate on the APM tests of the analog to digital linkage equipment and the analog computer section with the emphasis on the analog computer section. The digital computer section of the hybrid computer is maintained by the vendor and therefore is not included in the discussions of the APM program.
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