Figure 6. Drive Unit Frame Functional Components (front)

Figure 7 on page 10 shows the functional components of the drive unit frame with four 3590 tape subsystems and a 3590 Model A00 or A50 Control Unit, viewable from the rear (shown with rear door removed):

„1… Cartridge storage cells

Are located on the interior side of the front door and on the back wall of the frame.

„2… Rail system

The cartridge accessor is carried through the library on the rail system installed in each frame. The rail system consists of two horizontal rails, one at the top and one at the bottom of the frame.

„3… Power control compartment

Power to all components in the frame is distributed through the power control compartment.

„4… 3590 Model A00 or A50 Control Unit

The 3590 Model A00 or A50 Control Unit consists of a RISC processor and associated adapter cards.

„5… 3590 tape subsystems

From one to four 3590 magnetic tape subsystems can be installed along with the 3590 Model A00 or A50 Control Unit. From one to six 3590 magnetic tape subsystems can be installed without a Model A00 or A50 Control Unit (not shown).

Chapter 1. Introduction 9

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IBM Magstar 3494 manual „3… Power control compartment, „4… 3590 Model A00 or A50 Control Unit, „5… 3590 tape subsystems