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Using HP-41C Functions
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As you may have noticed by now, not all of the functions available in the
HP-41C are printed on the keyboard. In all, the HP-41C has over 130 standard
functions, 68 of which are immediately accessible by pressing function keys on
the keyboard.
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The rest of the HP-41C functions are accessible in different ways: from the
display or by assigning them to the USER mode keyboard. You simply press
XEQ execute and enter the function name into
the display in ALPHA mode. Or even easier, you can assign the function name
to a key location using the ASN (assign)
function and execute the function at the press of a single key in USER mode.
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With a couple of exceptions, all functions in the HP-41C can be
executed in this manner.
Section 6
lists and explains most standard HP-41C
functions except for programming functions. In addition, the function index
in the back of this handbook
(page 267) list all HP-41C standard
functions.
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Executing Functions From the Display
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Here is how it is done. Let’s compute the factorial
( FACT ) of 6. FACT is one of
the functions not available on the normal keyboard.
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To begin, key in the number 6 and press XEQ, the
HP-41C will place the word XEQ and
_ (underscore) prompts in the display,
like this:
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All you do now is place the name of the function you wish to execute into
the display. Initially, the HP-41C prompts you with
_ _ for a two-digit numeric label.
As soon as you press ALPHA to enter your function
name, the prompt changes to a single
_, prompting you for ALPHA characters one
at a time. When the HP-41C prompts you for an ALPHA character, simply press
the keys associated with the desired characters. Later, in part II, you will
see how to use XEQ to execute programs with numeric
labels by specifying a label number instead of an ALPHA name.
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