Hp 33s User Manual download pdf (Page 43)

100

101

RPN: The Automatic Memory Stack 2–3

Reviewing the Stack

(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



Pressing

four times rolls the numbers all the way around and back to where

they started:

14321

21432

321

43214

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.

(Roll Up)

The

|

(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.

12341

23412

34123

41234

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 386 387

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Hp 33s User Manual Page 43

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