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In disk storage
operations,
the Release and Reset
keys must be depressed
simultaneously.
Th ermal
Light. The
Thermal light
is
turned on if
the
internal
temperatures
of
the 1620, 1622,
or 1623 be-
come too high.
Power is turn ed
off,
and
the
Power
Ready
light
goes off. The
Thermal light
may be
turn-
ed off
by
pressin
g the
Reset
key
after
the
internal
machin
e temperatures
return
to
normal.
The
Power
switch must
be
turned off and on again
before
power
can
be
applied
to
th
e machine.
Emergency Off
Switch. This
switch
is
for
emergency
use only.
If pulled
to
O
FF,
all power in
the machine
is
turn ed off and
the blowers
that cool
the electronic
circuits are
stopped
as
well
. Turning the
blowers off
in thi
s
mann er
may
result in
damage to the
machin
e.
Program Switches and Indicators
Small incandescent
lights are
used
to
represent
the
o:\'
and
OFF
conditions
of internal check indicators.
Eight
console switches (
four Program and four Ma-
....
/lM1t CHIC
PO""
SWITCHES
eH'
• •
•
• •
.
•
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MU,(CI«
tlOCHI(
p,
cwa
OH
0"
ee
• •
• • •
~1to
__ •
.0 OUt
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CHk AltIT" CHW;
• •
9
,
•
eM
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I
•
STOP
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OM
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Figure 53.
Indicator
Lights
and Switches
chin
e
Check
) are
provided to externally control
the
execution of
machine
fun ctions for which
two alter-
native "logic paths" are
provided
. One
or
the
other
of
the paths is selected, depending
upon
the setting
of
the appropriate
switch
.
Machin
.
operation
may be
altered by
the
condi-
tion of
a machine
check indicator and an associated
check switch
( Figure
53
)
. An indicator that is turned
on
causes the
computer to halt if
the
associated check
switch
is
!>et to
STOP,
or to
continue
in automatic
mode
if
the
associated check switch
is
set to
PROGRAM.
Re-
gardless
of
the
check switch
setting, the
associated
check li ght provides
a
visual sign of
the
indicator
status.
Pressing the
Reset
key turns
all check indicators
and
lights off.
Disk
storage, Parity, I/ O,
and
Overflow
Check
indicators are
provided.
Disk Storage Indicators
Three
disk
storage indicators
and lights
are
used
when th
e
1311 Disk
Storage Drive
is attached to
the
system.
57
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