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Section 3: Automatic Memory Stack and ALPHA Register 44
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Manipulating Stack Contents
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The R (roll down),
R (roll up), and
X Y (x exchange y) functions
allow you to review the stack contents or to move data within the stack for
computation at any time. Note that R is one
HP-41C function that is not on the keyboard. It is executed from the display
or assigned to a key for execution. Execution of functions from the display and
assigning functions is covered in section 4.
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Reviewing the Stack
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To see how the R function works, first key in the
numbers 1 through 4:
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So the stack now looks like this:
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T
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4.0000
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Z
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3.0000
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Y
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2.0000
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X
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1 _
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Now press R :
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The stack now looks like this:
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T
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1.0000
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Z
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4.0000
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Y
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3.0000
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X
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2.0000
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When you press R , the stack contents shift
downward one register. The last number in the X-register rotates around to
the T-register. When you press R again, the
stack contents again roll downward one register.
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