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Appendix A: Design Concepts
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Rearranging the Stack
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The  R (roll down)
key lets you review the stack contents without losing data. It is also
used to reposition data within the stack. Here is what happens each time
you press R :
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| Press |
Contents |
Location |
| R |
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Example: Load the stack by pressing: 1 SAVE + 2 SAVE + 3 SAVE + 4. (The stack now contains x = 4, y = 3, z = 2, and t = 1). To review the contents of the stack press R four times. The fourth R returns the stack to its original position (x = 4, y = 3, z = 2, and t = 1).
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The x y key exchanges x and y as shown below.
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| Press |
Contents |
Location |
| x y |
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You will often find that x and y should be exchanged before a –, ÷ or yX operation.
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Example: Find 29
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| Press | See | Remarks |
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9
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9.
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SAVE
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9.00
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2
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2.
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x and y are in wrong order.
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x y
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9.00
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x and y are in right order.
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yX
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512.00
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