Instrument Unit(IU)
IU is a computer system controls whole of Saturn rocket. This was made by common design through all the series of Saturn I, IB, V.
IU from +Z View IU from -Y View
+Z View (Pos I)-Y View (Pos II)
IU from -Z View IU from +Y View
-Z View (Pos III)+Y View (Pos IIII)
Diameter :260in (6.604m)
Height :36in (0.9144m)
Weight(Average) :4500lb (2.04ton)
ManufacturerFIBM (International Business Machines Federal Systems Div. Huntsville, Ala.)

IU used with Saturn IB is almost the same as the thing developed for Saturn V. Most of the carried instruments and physical size are really the same as the Saturn V's. The main functions of IU are the direction control of the rocket, the ignition control of the engine, the timing control of instruments.

Look saturn V IU page for more information.

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