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5
3
.
KEYS AND SWITCHES
[£J
Clear
k
ey
After
numeri
c
keys,
decimal point key.
sign
change key, or
exponent key.
depression
of the
@J
key
will
clear
the
display
regis
ter
" x",
At all
other
times,
depression
of
the
@J
key will clear
entire machine
except
the
memory
regincr.
At any
time,
depression
of the
@]
key twice
will
make the machine
cleared except the memory.
After
error
condition
this key
is
used to
resume
successful
operation.
~
...
~
Numeric
keys
The
appropriate numbers are indexed
by
depressing
these
keys.
8
Decimal
point
key
The
decimal
point can be entered
at
any location by
this
key.
EJ
EJ
0
Basic
arithmetic funclion keys
GG
Depress
these
keys
in
accordance
with
the
algebraic
expression.
[~-I
Sign
change key
Used
to cha
nge
the
sign of any number
already disp
layed
by depressing this
key.
Aftcr
~
key
this key
changes
the
sign
of the
exponent.
[x
~YI
ElCehange key
This
key
exchanges the
conten
ts of disp lay register for
constant
register.
[HPJ
Exponent
key
Used to
enter ex ponents
(po wer
of 10).
If
I!!!I
key is
the
fust key of
numbe
r
entry.
then
the
mantissa
is
automatically made to be 1 and
the
exponent display
is
L1nblanked
. If
I!!B
key is
not
the first key,
it
caLl5esentry of
the mantissa to
be
terminated
and previously entered
mantissa
is not changed.
After
~
key
nLimed
c key
de-
pressions enter a
power-of-ten
exponent
which
shifts
right-
to-left through
the two
exponen
t digits.
The
E:J
key will
be ignored.
Additional
~
key
will
clear
the
exponent
two digit.
Any
key
other
than
numeric keys,
8 .
~
,or
.'
will
terminate
both
the
ex
ponent
en
try
and
num
ber en try.
o
Pi
key
Aut omatically
enters
the valLi
e of
pi (3.14 15926)
into
display.
IM+
J
Memory
plus
key
By this key
the
numbe"
displayed are
added to tile
contents
of
memory.
If
the
addition
would cause
an
over-
!low,
the
memory
register
will
be
protected to its
original
value, and the
error
condition will
be set.
6
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