Cray CRAY-1 - Introduction

PHYSICAL ORGANIZATION
INTRODUCTION
The CRAY-1 computer system consists of the following:
-
The CPU mainframe
- A power cabinet
- A condensing
unit
- Two motor generators and control cabinets
- A maintenance control
unit (MCU)
- One or more disk systems, and
- Optional interfaces to one or more front-end comouter systems.
riAl N FRAME
2
The CRAY-1 mainframe, figure 2-1, is composed of 24 logic chassis. The
chassis are arranged two per column in a 270
0
arc which is about five feet
in diameter.
The twelve columns are about 6 1/2 ft tall. At the base of
the columns, 1 1/2
ft high and extending outward about 2 1/2 ft, are
cabinets for
power supplies and cooling distribution systems.
Viewing the cabinet from the top, the chassis of the upper circle are labeled
A through L proceeding in a counter-clockwise
direction from the opening.
The chassis of the lower circle are labeled M through X. The assignment
of
modules to chassis is illustrated in figure 2-2.
MODULES
The CRAY-1 computer system uses only one basic module construction through-
out the
entire machine. The module consists of two 6 x 8 inch printed
circuit boards mounted on opposite sides of a heavy copper heat transfer
plate. Each printed circuit board has capacity for a maximum of 144
integrated circuit (IC) packages and approximately 300 resistor packages.
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,2-1
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