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RPN: The Automatic Memory Stack
2–3
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Reviewing the Stack
R
(Roll Down)
The
<
(roll down) key lets you review the entire contents of the stack by
"rolling" the contents downward, one register at a time. You can see each
number when it enters the X–register.
Suppose the stack is filled with 1, 2, 3, 4. (press 1
Ï
2
Ï
3
Ï
4)
Pressing
<
four times rolls the numbers all the way around and back to where
they started:
T
1
4 3 2 1
Z
2
1 4 3 2
Y
3
2 1
4
3
X
4
3 2 1 4
What was in the X–register rotates into the T–register, the contents of the T–register
rotate into the Z–register, etc. Notice that only the contents of the registers are
rolled — the registers themselves maintain their positions, and only the X– and
Y–register's contents are displayed.
R
(Roll Up)
The
º
;
(roll up) key has a similar function to
<
except that it "rolls" the
stack contents upward, one register at a time.
The contents of the X–register rotate into the Y–register; what was in the T–register
rotates into the X–register, and so on.
T
1
2 3 4 1
Z
2
3 4 1 2
Y
3
4 1 2 3
X
4
1 2 3 4