Introduction To Nova 4/C Computers - Data General NOVA 4/C Field Engineering Maintenance Manual

Data General Corporation (DGC) has prepared this manual for use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole or
in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith.
Chapter 1
INTRODUCTION TO NOVA 4/C COMPUTERS
NOVA 4/C computers incorporate a modular design plus
self-diagnostic capabilities that facilitate maintenance and
provide high reliability. In most cases, the user can identify
the failing field replaceable unit by running simple tests,
thus minimizing repair time.
The NOVA 4/C computer supports up to 64K bytes of
dynamic RAM (random access memory).
NOVA 4 computers are rack-mounted in NEMA-standard
equipment cabinets. These cabinets also provide housing
for NOVA line peripheral equipment, such as magnetic
tape drives and rack-mounted disc drives.
The computer consists of the following basic modules,
which are tailored to the user's selected configuration:
e Computer chassis
e Power supply
e Printed circuit CPU board
CHASSIS
Two computer chassis are available to NOVA 4 users: 5-
and 16-slot. Each has its own backpanel printed circuit
board with connectors for the system printed circuit boards.
These boards, including a slide-in power supply board (5
or 16-slot version), are inserted from the front of the chassis,
which is easily accessed by removing the NOVA 4 front
panel attached to the equipment cabinet. Access to the
backpanel is via the rear door of the equipment cabinet.
16-Slot Chassis
This chassis holds up to sixteen 15-inch by 19-inch printed
circuit boards plus the 16-slot power supply and fan
module.
Bus termination for the backpanel is provided by a resistor
fence (soldered into the backpanel below slot 1) and two
bus terminator cards, one for the A side and one for the B
side. The bus terminator cards push onto the backpanel
pins of slot 2.
The 16-slot chassis supports up to fifteen I/O paddleboards,
which are vertically mounted at the rear of the unit.
POWER SUPPLY
PRINTED CIRCUIT
Figure 1.1 16-Slot chassis (front view)
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