HP 35s HP 35s scientific calculator - User Guide - Page 49
The X and Y-Registers are in the Display, Clearing the X-Register, Reviewing the Stack - reviews
UPC - 000000000000
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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 RPN: The Automatic Memory Stack 2-3