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2–4 RPN: The Automatic Memory Stack

File name 33s-E-Manual-1008-Publication(1st).doc Page : 386

Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm

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To swap the order of numbers in a calculation.

For example, one way to calculate 9

(13

8):

Press 13

The keystrokes to calculate this expression from left–to–right are:

Note

Always make sure that there are no more than four numbers in the

stack at any given time — the contents of the T–re

ister (the top

Arithmetic – How the Stack Does It

The contents of the stack move up and down automatically as new numbers enter

the X–register (lifting the stack) and as operators combine two numbers in the X–

and Y–registers to produce one new number in the X–register (dropping the stack).

Suppose the stack is filled with the numbers 1, 2, 3, and 4. See how the stack drops

and lifts its contents while calculating

1. The stack "drops" its contents. The T–(top) register replicates its contents.

2. The stack "lifts" its contents. The T–register's contents are lost.

3. The stack drops.

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Notice that when the stack lifts, it replaces the contents of the T– (top) register

with the contents of the Z–register, and that the former contents of the

T–register are lost. You can see, therefore, that the stack's memory is limited

to four numbers.

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