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Section 3: Automatic Memory Stack and ALPHA Register 47
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Immediately after you press ENTER , the X-register
is prepared for a new number, and that new number writes over the number
in the X-register.
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Now, continue by keying in a new number.
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The ENTER key has separated the digits of the first
number from the digits of the second number and 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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2.0000
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Y
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987.3000
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X
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537.91
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Notice that numbers in the stack do not move when a number is keyed in
immediately after you press ENTER ,
CLX ,
Σ+ , or
Σ– . However, numbers in the stack
do lift upward when a new number is keyed in immediately after you execute
most other functions. Including R and
X Y . Refer to appendix C for a complete
list of the operations that cause the stack to lift.
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Clearing the Stack
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CLST (clear stack) clears each of the
automatic memory stack registers to zeros. CLST can
either be executed from the display or assigned to a key location and executed
by pressing that key in USER mode. CLST is most useful
if it is assigned to a key for USER mode execution. USER mode and display
execution are both covered in section 4.
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One-number Functions and the Stack
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One-number functions operate upon the number in the X-register only. The
contents of the Y-, Z-, and T-registers are not affected when a one-number
function is executed.
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For example, key in the following numbers and execute the
function:
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0.0000
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27.93 _
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27.9300
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167.54 _
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12.9437
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