ARITHMET
IC
KE
YS
The arithmetic keys operate on
the
X and Y registers, entering
th
e 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 regist
er
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
s
ter
from
the
c
ont
e
nt
s
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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