SAV. INSERT
~
POtA/#1t
0"
•
.---:
RESEr
Figure 12. Control Ke s and Signal Lights
Th
e
automatic
H
ght
,
wh
en on, indicates th
at
th com-
put
er
is
in
auto
ma
ti
c
mod
e (e.g., , hile executing a
stor
ed
proGram or while e
nt
ering
dat
a
int
o core stora
ge
from
the
typ
ew
riter k
ey
board
) .
Manual
mode
is
initiated a
nd
the ma
nu
al
light
is
turn
ed
on
by
th
e execution of a H
alt
instr
uc
tion or b
pr
essing the release key (on an I/ O
ope
ra
ti
on onl
y),
insta
nt
stop key,
or
stop k
ey
.
Pr
essing th s
tart
key,
inse
rt
k y, or display
fAR
key
initiat
es a
utomatic
mod
e
and
turns
th
e
manual
li
ght
off.
Th
save
li
g
ht
and
/o
r
the no feed
li
g
ht
ca
n be on
wh
en th
manua
l
li
g
ht
is o
n.
Both
th
e
manual
a
nd
automatic
li
g
ht
s ar on
wh
en
an insb'uction
is
single-cycled with the seE key.
RESET
KEY
Th
e reset k y is used to restore a
ll
machine status indi-
cators, m
ac
hine ch ck indicators, a
nd
signal
li
g
ht
s to
th
ei
r initial or reset condition.
Th
e reset key
funct
ions
only
when
th
e
comput
er is in the
manu
al
mod
e (manual
light
on ).
Parity
errors can
occur
if
th
res t k Y is u
se
d
while
the
comput
er is in the automatic
mod
e.
'
''h
en the
computer
is in
th
e
automatic
m
ode
, the insta
nt
st
op
key s
hould
be
pr
essed to
put
the co
mput
er in the
manual
mod
e
and
p
er
mit
use of the reset k
y.
I
NSERT
KEY
A 'D 1
SERT
LIGHT
Pressing
th
e inse
rt
k
ey
places
th
e 1620 in a
ut
oma
ti
c
mod
e.
Pr
essing
th
e
in
se
rt
key also t lrns on the in
se
rt
light
and
activates
th
e t
ypew
rit
er keyboa
rd
so
that
direct e
ntr
y of
insb
'uctions
ma
y be made in
num
ri
ca
l
mod
e, starting
at
00000
and
continuing
into
higher-
numb
ered stor
age
positions.
As
man
y as 100 digits
ma
y
be keyed in. After
th
e 100th dig
it
is
e
nt
ered, an auto-
matic
release is
initiat
ed
and
the 1620 returns to manual
mod.
Pr
ess
ing
the
start
k
ey
initiat
es co
mput
er
opera
-
tion
beginnin
g
at
00000.
SA
VE
KEY
A D
SAVE
LIGHT
Pressing
the
save
key
turns
on
th
e save
li
g
ht
and
saves
the
address
of
the
next
sequential
instruction to be
executed.
This
address is saved in
Product
Addr
ess
Register 1
(PR-l
).
94
AUTOMA
TIC
....
HUAI..
RELEASE
KEY
Th
e release key
is
u
se
d to te
rminat
e any
input
/
output
operation,
including
console key
bo
a
rd
nb
'y
of
dat
a
into
core storage.
Wh
en this k
ey
is
pr
essed,
manual
mod
e
is initiated, the ma
nual
li
g
ht
is
turn
ed on,
and
the ins
rt
li
g
ht
is turn
ed
off.
Th
release k y is
op
erative only when the co
mput
er
is in automatic
mod
e
and
performing an r/ o
op
eration.
ST
OP
/
IE
(S
I
NG
LE
I
NS
TRUCTION
EXECUTE)
K
EY
PI'
ss
ing the stop/ sm key stops the
comput
er in
manual mode at the
nd
of the in h'uction being ex-
cut
d.
Th
e stop
/s
m key also serves as a single instru
ct
ion
exec
ut
e key. Successive de
pr
ss
ions
of
th
e key cause
one instruction to he exec
ut
ed for
eac
h de
pr
ss
ion.
Th
e
man
ua
l
li
g
ht
remains on.
[
l\'S
T
ANT
STOP
/
SCE
(SI
'
GLE
CYC
LE
EXE
C
UTE)
KEY
Pr
e s
in
g the insta
nt
stop/ sm k
ey
causes the ma-
chin to st
op
at the e
nd
of the 20-micros co
nd
m
ac
hine
cy
cl
e in progr ss. Successive de
pr
essions of the key
cause single
ma
chine cycles. "Both ma
nu
al a
nd
aut
o-
matic Hg
ht
s remain on.
C
HE
CK
STOP
LIGHT
Th
e ch
ec
k stop
li
ght
is
turn
ed on when the
machin
e
stops because of a
paJit
y
chec
k.
One or
mor
e of the
parit
y
o~
I/ O ch
ec
k indicators
that
caus d the st
op
is
also on.
Th
e ch
ec
k stop
li
g
ht
is
turn
ed off
wh
n the
check indicators ar reset
or
the parity or I/ O switch
is set to
PROGRAM
.
DISPLAY
MAR
KEY
Th
e di
sp
lay
MAR
key is
op
erative only
wh
en
th
e
manu
al
li
g
ht
is on
and
the
automatic
lig
ht
is off.
Pr
essing the
display
MA
R key causes dis
pla
y
of
the
MARS
r
eg
ist
er
to which the
MARS
dis
pla
y sel
ec
tor
sw
it
ch is set.
Th
e
rotary
switch should
not
be
turn
ed
while
th
display
MAR
key is
pr
essed.
R
EA
DER
0
FEED
LIGHT
Th
e re
ader
no f
ee
d
li
g
ht
is
turn
ed on
when
the com-
put
er a
tt
e
mpts
a
pap
er
tape
r
ea
d or
card
r
ea
d
opera
-
tion
and
the
r
ea
der
is
not
in
the
r
ea
dy status.
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