Interesting rack-mounted Saturn Substitute Control Computer, Mod. I, used at Kennedy Space Center as ground support equipment to simulate some functions of the Saturn V's Flight Control Computer for testing. The unit measures approximately 19" x 7" x 10" and contains seven cards marked "IP," "IIP," "IIIP," "IVP," "IY," "IIY," and "IIIY," evidently corresponding to pitch and yaw of the stage's four outboard motors (it is curious as to why the slot that should hold 'IVY' is empty and unlabeled). Two 'Beta Scaling Resistor' boards are also installed on the left side. The rear features four recessed ports, marked "J4," "J3," "J6," and "J5." An attached yellow service and inspection tag identifies the piece as "Saturn Sub Control Computer, KSC," and is stamp-dated September 22, 1970. Exhibits general overall wear. On the Saturn V, the analog flight control computer issued commands to steer the vehicle by gimbaling the engines to control roll, pitch, and yaw.
