Data General Service ECLIPSE MV/7800

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1.3.2 Power Supply

The power supply converts ac line voltage to the regulated dc voltages required by the system. It is

a 750 watt

switching type that has a microprocessor based intelligent controller.

1.3.3 I/O Controllers

The I/O controllers provide the facility for moving data in and out of the CPU. The particular I/O

controllers used

will depend on the system configuration. Refer to the related peripheral documentation for a

description of the

I/O controllers.

1.3.4 CPU Chassis

The CPU chassis has a 16-slot backplane that accepts the CPU I/O PCBs. After the regulated power

supply, the

first and second

slots are for the CPU PCB. The CPU PCB plugs into slot 1 and if there is a memory

expansion

PCB, it occupies the space of slot 2. The memory expansion PCB is a daughter card that connects to

CPU PCB.

The remaining slots are allocated for I/O controllers (Figure

1-2).

FAN

MODULE

-5 V BOOSTER, BUS REPEATER, OR I/O

-5 V BOOSTER OR I/O

—

I/O ONLY

OPTIONAL EXPANSION MEMORY

CENTRAL PROCESSING UNIT

POWER SUPPLY

FS-12782

Figure 1-2. CPU Chassis Configuration

043-003621

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1-6

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Data General Service ECLIPSE MV/7800 - Page 16