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Section 3: Automatic Memory Stack and ALPHA Register 48
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Here is what happens when you executed the
function:
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First, after you keyed in the numbers, the stack looked like this (the T- and
Z-registers are shown cleared to zero for clarity):
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T
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0.0000
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Z
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0.0000
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Y
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27.9300
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X
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167.54 _
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Then when you pressed , the result, the
square root of the number in the X-register, was placed in the X-register
(displayed).
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T
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0.0000
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Z
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0.0000
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Y
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27.9300
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X
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112.9437
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The one-number function executes upon only the number in the displayed X-register,
and the answer writes over the number that was in the X-register. No other
stack register is affected by a one-number function.
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Two-Number Functions and the Stack
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The HP-41C performs arithmetic operations by positioning the numbers in the
stack the same way you would on paper. For instance, if you wanted to add 17 and
46 you would write 17 on the paper and then write 46 underneath is, like this:
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and then you would add, like this:
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Numbers are positioned the same way in the calculator. Here’s how it
is done.
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0.0000
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17 _
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17.0000
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46 _
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63.0000
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