How Enter Works - HP -32S Owner's Manual

How ENTER Works
You know that Ienter Iseparates two numbers keyed in one after the
other. In terms of the stack, how does it do this? Suppose the stack is
again filled with 1, 2, 3, and 4. Now enter and add two new numbers:
i
5 + 6:
1 lost
2 lost
2 3
3 4
4 5
5 5
I ENTER|
IS
3
1 Lifts the stack.
2 Lifts the stack and replicates the X-register.
3 Does not lift the stack.
4 Drops the stack and replicates the T-register.
0
4
11
Ienter Ireplicates the contents of the X-registerinto the Y-register. The
next number you key in (or recall) writes over the copy of the first
number left in the X-register. The effect is simply to separate two se
quentially entered numbers.
You can use the replicating effect of Ienter Ito clear the stack quickly:
press 01enter I("enterICenter I. All registers now contain zero. Note,
however, that you don't need to clear the stack before doing
calculations.
Using a Number Twice in a Row. You can use the replicating fea
ture of Ienter I to other advantages. To add a number to itself, press
ienter inn.
Filling the Stack With a Constant. The replicating effect of Ienter
together with the replicating effect (from T into Z) of stack drop al
lows you to fill the stack with a numeric constant for calculations.
2: The Automatic Memory Stack 39