F-111D computer complex.

TL;DR: A concise description of the Mark II computer complex in the F-111D avionic system is presented, with emphasis on the features related to the computer complex design concept and to the achievement of the design objectives.

Abstract: A concise description of the Mark II computer complex in the F-111D avionic system is presented. Emphasis is placed on the features related to the computer complex design concept and to the achievement of the design objectives. Operation of the equipment under stored program control is described to illustrate how the units of the computer complex are integrated into a functional element. Finally, some considerations unique in a computer system of this type are described. The computer complex consists of two general-purpose, airborne digital computers and a three-section signal converter. The primary design objectives set for the computer complex were to provide 1) selective functional redundancy to enhance the probability of mission success and 2) flexibility to accommodate system mechanization changes. Redundancy has been implemented through the incorporation of backup routines in each computer and separate sections in the converter to communicate with each computer. The required flexibility has been achieved through the use of a powerful executive routine for controlling the operation of stored programs and through the allocation of provisions for additional storage and input-output.