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ARITHMETI
C
KEYS
The arithmetic keys operate on the X and Y
registers,
entering
the result of the calculat1on mt
the Y register and leaving the X register unchanged.
Adds the contents of the X register to the contents of the
Y register. The sum is entered into the Y register and the
X register is unchanged.
8
+
4
==
12
~
y
t
CLEAR
8
4
+
6
+
7
+
4
-=
17
~
y
t
CLEAR
6
7
+
4
+
0.
I
2.
1.{.
D
.
I 1.
1.{.
Subtracts the contents of the X reg1 ster from the
contents
of the
Y
register. The difference 1s entered mto the Y
register and the X register is unchanged.
1
7
-9
==
8
~
Y
CLEAR
1
t
7
9
47
-
19
-
8
+
5
-=
25
~
y
t
CLEAR
4
7
1
9
-
8
-
5
+
D.
8.
9.
0.
2
5.
5
1
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