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THE KEYBOARD
ARITHMETIC KEYS
The four arithmetic keys,
+,
-,
x,
-:-,
are used to perform
operations on the numbers in the X and Y registers. The result
of the calculation appears in the Y register and the number in
the X register remains unchanged. The number in the Z regis-
ter is not affected.
A calculation using all four keys and
illustrating
some step-
saving hints 1s included after the
7
key has been explained.
Adds the number in the X register to the number in the
Y register. The sum appears in Y; the X and Z registers
remain unchanged.
EXAMPLES:
SWITCH:
FIXED POINT
SET: DECIMAL DIGITS to
5
(a)
8
+
4
==
12
(lf contents of
X
are unterminated press CLEAR
X.)
PRESS:
DISPLAY
8
t
4
original contents of
Y
/2.
+
~z
~y
4.
~
.r
(b)
6
+
7
+
5
==
18
(contents
of Z to remain unchanged throughout
the calculat1on)
PRESS:
PRESS:
DISPLAY
6
7
5
+
original
contents
of
z
18
.
5.
+
~
z
~y
-+X
31
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