EasyManuals Logo

IBM 7090 User Manual

IBM 7090
190 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #178 background imageLoading...
Page #178 background image
Indicators
Systems
Driver
Indicator
-
Systems
End
OP
00.20.19.0
8.00.09.1
FP
00.20.19.0
2.10.29.1
I
Time
00.80.00.0
8.00.18.0
I-a
Check
00.20.41.
0
2.10.53.1
Index
Reg
A-B-C
00.20.70.0
2 .
70.
01. 1
to
2.
07
.
15.
1
L
Time
00.80.00.0
8.00.20.1
Master
Stop
00.20.19.0
4.20.11.
1
MQ
Indicators
00.20.40.0
2.04.00.1
to
2.04.35.1
MQ
Overflow
00.20.14.0
02.10.51.1
Multiple
Time
Error
00.80.00.0
8.00.17.1
Program
Counter
(3-17)
00.30.40.0
3.
05. 00. 1
to
3.
05. 07. 1
Program
Register
(S,
1-9)
00.30.50.0
3.04.00.1
to
3.04.03.1
Program
Counter
(3-17)
00.30.40.0
3.
05. 00. 1
to
3.
05. 07. 1
Q
Carry
00.20.19.0
2.10.36.1
R-W
Select
00.20.14.0
6.00.02.1
Ready
00.20.41.
0
4.20.13.1
Sense
Lights
(1,2,3,4)
00.20.90.0
2.09.60.1
Shift
Counter
(10-17)
00.30.40.0
3.04.14.1
to
3.04.17.1
Simulate
00.20.14.0
2.10.70.1
SR
Indicators
00.20.11.
0
2.01.
00.1
to
2.01.
35.1
T2
00.20.19.0
2.10.38.1
Tally
Counter
(1-5)
00.20.17.0
2.
10.
21.
1
to
2.
10.
22.
1
Tape
Check
Trap
(A-H)
00.60.02.0
60.38.03.1
Trap
00.20.14.0
2.10.53.1
Trap
Control
Indicators
00.60.02.0
2.10.56.1
X
Carry
(AD-3)
00.20.19.0
2.12.76.1
9
Carry
00.20.19.0
2.10.37.1
9
Overflow
02.20.19.0
2.10.39.1
7.3.02
Indicator
Lights
Indicator
lights
are
small
incandescent
lamps
rated
at
10
volts,
15
rna.
Power
is
brought
in
through
a
two-pin
base.
One
pin
is
connected
to
the
yellow
input
signal
cable,
while
the
other
is
returned
to
-12
volts
(violet
wire).
Removal
and
Replacement
Some
machines
use
special
clips
to
hold
the
indicator
lights;
others
use
regular
sockets.
Open
the
back
panel
to
make
sure
of
which
you
have.
Regular
sockets
present
no
problem;
merely
pull
out
the
old
light
and
push
in
a
new
one
to
replace
it.
If
special
clips
are
used,
it
may
be
necessary
to
remove
the
voltage
leads
before
taking
out
the
light.
If
this
is
the
case,
flip
the
console
DC-off
switch
to
knock
down
power
before
removing
the
leads.
Then
use
a
plier,
wrench,
or
special
tool,
if
it
is
available,
to
loosen
the
clip
and
remove
the
light.
These
indicator
lights
are
somewhat
delicate,
so
use
care
when
replacing
them.
Refer
to
Section
7 .
3.
01,
Service
Aids,
for
a
list
of
indicator
lights
and
corresponding
Systems
pages.
177

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the IBM 7090 and is the answer not in the manual?

IBM 7090 Specifications

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