HP HP-65 - Page 12

Combined Arithmetic Operations. Anytime a new number is
entered after an operation, the HP-65 performs an automatic
ENTER4 on the result of that operation. This feature allows you
to work serial calculations as well as chain and mixed chain cal-
culations. Notice that we implicitly used this in the following:
Sample Case:
[(4X5) / 2+3)] —6=—2
Press
4 ENTER#
5%
2 |[ENTER4
3+
6 —
See Displayed
Notice that the numbers are entered in the same order as they
appear in the problem. Now consider the stack contents as we
do the same example.
Stack Register
T
P4 20 20
Y 4 4 20 2 2 20 4
X 4 4 5 20 2 2 3 5 4 6 -2
Keys (2] [+ [5] x [2] '+ [3] + = [6] [-
Note: ENTER4 is here abbreviated as ¢+ .