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IBM 7090 User Manual

IBM 7090
190 pages
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7.6.00
TAILGATE
The
tailgate
area
contains
all
the
signal
and
power
connectors
that
enter
and
leave
the
console.
It
is
located
in
gate
H
of
the
console
frame.
See
Figure
7.
6-1.
7.6.01
Signal
Connectors
The
tailgate
contains
twelve
si~al
connectors,
sometimes
called
"biscuits,"
each
of
which
holds
40
conductors.
7 .
6.
02
Power
Connectors
Three
Winchester
male
power
connectors
are
mounted
at
the
base
of
the
tailgate
assembly,
at
an
angle
to
the
vertical
signal
connector
portion.
They
consist
of
a
104-
conductor,
a
34-conductor,
and
a
75-conductor
connection.
The
104-conductor
cable
contains
the
marginal
checking
control
lines,
the
34-conductor
cable
contains
the
400-
cycle
lines
from
the
power
distribution
frame
(PDF),
and
the
75-conductor
cable
con-
tains
the
60-cycle
power
and
other
miscellaneous
control
lines
to
and
from
the
PDF.
Removal
and
Replacement
Be
sure
the
marginal
check
voltages
are
all
at
normal
before
removing
the
104-
conductor
cable.
The
three-power
connectors
can
be
removed
from
the
console
in
any
order.
When
replacing
cables,
hold
the
connector
with
its
female
lug
on
the
left
side
as
it
faces
the
tailgate.
181

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IBM 7090 Specifications

General IconGeneral
CategoryMainframe Computer
Introduced1959
Transistor-basedYes
Word Length36 bits
Add Time4.8 microseconds
MemoryCore memory
Memory (words)32, 768 words