HP HP-67 - Page 65

The Automatic Memory Stack 61
Numbers are positioned the same way in the HP-67. Here’s how it
is done. (As you know, it is not necessary to remove earlier results
from the stack before beginning a new calculation, but for clarity,
the following example is shown with the stack cleared to all zeros
initially. If you want the contents of your stack registers to match
the ones here, first clear the stack by using the and keys
to fill the stack with zeros.)
Press Display
D
D
GRS Stack cleared to zeros
initially.
4 34 34 is keyed into X.
34.00 34 is copied into Y.
1 21. 21 writes over the 34 in X.
w
1
it
N
Now 34 and 21 are sitting vertically in the stack as shown below,
so we can add.
T 0.00
V4 0.00
Y 34.00
X 21. Display.
Press Display
The answer.
The simple old-fashioned math notation helps explain how to use your
calculator. Both numbers are always positioned in the stack in the
natural order first, then the operation is executed when the function
key is pressed. There are no exceptions to this rule. Subtraction,
multiplication, and division work the same way. In each case, the
data must be in the proper position before the operation can be
performed.