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RPN: The Automatic Memory Stack 2-3
The X and Y–Registers are in the Display
The X and Y–Registers are what you see except when a menu, a message, an
equation line ,or a program line is being displayed. You might have noticed that
several function names include an x or y.
This is no coincidence: these letters refer to the X– and Y–registers. For example,
raises ten to the power of the number in the X–register.
Clearing the X–Register
Pressing () always clears the X–register to zero; it is also used to
program this instruction. The key, in contrast, is context–sensitive. It either clears
or cancels the current display, depending on the situation: it acts like
1() only when the X–register is displayed. also acts like
() when the X–register is displayed and digit entry is terminated
(no cursor present).
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 the numbers
as they roll through the x- and y-registers.
Suppose the stack is filled with 1, 2, 3, 4. (press
) 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
49


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