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LOAD
on
the
processor-controller console. During IPL,
one
card
is
read into 40 main storage
locations beginning
with the location specified
by the I-register. Following this
load
action,
the processor-controller branches to location
0000 to
begin
program execution.
The mode switch should
be
on RUN or Sl/CS for program
operation.
The 1442
designated
as first on the system is used
for IPL.
OPERATOR CONTROLS
(Figure
11)
Th
e
Power
On
Light
is on when operating
power is being
suppli ed
to the
1442 control circuits.
Th
e
R
eady
Light
is on when
the 1442
is able
to
ac~ept
com-
mands from
the
program. The following conditions are
required
:
1.
Power
on.
2
.
Card properly registered
at
read
station.
3
.
Either cards in the hopper or the
1442
is
in last-card
routin
e
.
4.
Stacker not
full.
5.
Check ligh t off.
6.
Chip box light off.
Th
e
Chip Box Light
turns on
when
the
chip box is
either
Figure
11. 144
2
Key
s
and Lights
full or
has been removed
.
This
condition
removes
the
1442
from ready
status.
The Check Light
turns
on
when
one of the eight error con-
ditions
exists
as indicated by the backlighted panel
on
the
1442. Anyone
of these error conditions
removes the
1442
from
ready
status and
can
be reset
only
by pressing
NPRO
with the hopper empty.
The HOPR
(Hopper)
Light
turns on when
a
card fails to
pass properly
from the hopper
to the
read station.
The Feed CLU (Clutch) Light,
when
on, indicates
that
a
feed
cycle was taken that was not
requested.
The Read
R
EG
(Registration) Light
turns on when a read
error
has occurred due to incorrect registration
of
the
card
IBM
1442 Card
Read Punch
29
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