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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.
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