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ters are labeled Z and T.
The
(roll down) key reviews the contents of the stack by
"rolling" the contents downward, one register at a time. Sup-
pose the stack is filled with 1, 2, 3, 4
(1Ï2Ï3Ï4). Pressing
"rolls" the numbers back into their original order. (See Figure 4).
The
(roll up) key works the same as
stack contents upward.
1
T
2
Z
3
Y
<
4
X
The
key (x exchange y) switches the contents of the X–
and Y–registers without affecting the rest of the stack. Pressing
twice restores the original order of the X– and Y–register.
The
function is used primarily to swap the order of num-
bers in a calculation. For example, to calculate 9 ÷ (13 x 8),
enter 13Ï8¸9w¯.
The LAST X register is a companion to the stack; it holds the
10
Getting Started
Figure 4 RPN Stacks
4
3
1
4
2
1
<
3
2
four times
, except it "rolls" the
2
3
4
<
<
1
1
2
3
4
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