I
COOLING
Modules
in the
CRAY-1
computer system are cooled
by
the
exchange
of heat
from
the
module
heat sink to a refrigerant-cooled cold bar.
The
module
heat sink
is
wedged
along both 8-inch edges to a cold bar.
Cold
bars are
arranged in
vertical
columns, with each
column
having capacity for
144
modules.
The
cold bar
is
a
cast
aluminum
bar containing a
stainless
steel
refrigerant
tube.
MAINTENANCE
CONTROL
UNIT
The
CRAY-1
computer
system
is
equipped with a
16-bit
minicomputer system
that
serves
as
a maintenance tool
and
provides control for the system
initialization.
After the
CRAY-1
operating system
has
been
initialized
and
is
operational,
communication
with the
MCU
is
via a software protocol.
The
MCU
is
connected to a
CRAY-1
channel
pair
with additional control
signals for execution of the master
clear
operation,
I/O
master
clear
operation,
dead
dump
operation,
and
sample
parity
error
operation.
The
maintenance control unit
(MCU)
includes:
1.
A
Data
General
ECLIPSE
minicomputer or equivalent with
32K
words
of 16-bit
memory
2.
An
80-column
card reader
3.
A
132-column
line
printer
4.
An
800
bpi
9-track tape unit
5.
Two
display terminals
6.
A
moving
head
disk drive
Included in the
MCU
system
is
a software
packaqe
that
enables
it
to
serve
as
a local batch
station
during production hours.
As
a local
station,
diagnostic routines
may
be
submitted
for
execution along with
other batch jobs.
These
diagnostics are typicnlly stored
on
the local
disk
and
are submitted to the
CRAY-1
by
operator
command.
The
system
initialization
procedure
is
referred to in
this
manual
as
the
dead
start
sequence. This sequence
is
described in
detail
in
Section
3.
Detailed information about the
MCU
is
presented in separate publications.
2240004
2-6
E
To Next Page
Loading...