Specifications
5
CONTROLS & INDICATORS
NOTE:
Descriptions
that
follow
wili
be
beller
understood
jf
you
take
a
moment
to
learn
these
basic
facts.
First,
two
separate
registers
are
provided
for
retaining
the
numbers
you
enler
into
the
Calculator
for
an
aritt,metic
oper"atlon.
One
is
the
Display
Register
which
is
aiso
refened
to as
the
x
Register.
The
other
is
Working
Register
or
y
Register.
Any
number
you
enter
is
keyed
direcily
into
the
Display
IX
Register)
for
yOU!
visual
review.
This
entry
is Hlen
completed
wrlen
you
key
in
the
appropriate
arithmetic
operative
(+,
-.
x,
or
_C-_).
As
you
begin
to
enter
the
second
number,
ttle
first
is
automatically
transferred
fom
the
x
Register
to
the
y
Register.
The
y
Register
retalns
this
first
number
until
you
clear
it
or
you
exchange
contents
of
the
x
and
y
Registers
by
means
of
a
special
key
provided
for
that
purpose.
Second,
your
Calculator
Keyboard
was
designed
for
a
minimum
of
keys
in
order
to
pro'liide
optimum
fingertip
access
within
conven'lent
confines.
This
feature
was
enabled
by
incorporat-
ing
a
block
of
dual
purpose
keys
that
work
in
conjunction
with
an
electronic
"shift"
system.
Ttle
electronic
"shit\"
of
your
calculator
compares
with
the
shift
of
a
typewriter.
Your
calculator
responds
10
the
characters
on
the
keys
in
its
unshifted
mode,
and
it
must
be
shifted
each
time
a
keyis
to
be
operated
for
a
function
printed
above
a
key.
The
calculator's
shift
key
is
\dent(Hed
by tile lettel' ··F". ReIer to tile sec!Ion
of
PRELIMINAi1Y
INSTRUCTION
for
details
of
dual
purpose
Keys.
- 5.
4
..
~=-
3.
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2£
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