HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 43
Reviewing the Stack, rolled - the registers themselves maintain their positions, and only the X-
UPC - 082916001456
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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 each number when it enters the X-register. Suppose the stack is filled with 1, 2, 3, 4. (press 1 2 3 4) Pressing four times rolls the numbers all the way around and back to where they started: T1 4 3 2 1 Z2 1 4 3 2 Y3 2 1 4 3 X4 3 2 1 4 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. Rµ (Roll Up) The | (roll up) key has a similar function to stack contents upward, one register at a time. except that it "rolls" the 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. T1 2 3 4 1 Z2 3 4 1 2 Y3 4 1 2 3 X4 1 2 3 4 RPN: The Automatic Memory Stack 2-3