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Section 6: Functions continue 106
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The HP-41C has five functions that are used to control the operating status
of the calculator. The are
ON ,
OFF ,
AON ,
AOFF , and
PRGM . Notice that ON and
PRGM cannot be recorded as instructions in a program.
User mode is controlled either by the USER key or
by a special USER mode flag. You will learn more about flags in
section 14.
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Power ON
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When you press the ON key, it simply toggles
the HP-41C power on and off. You may remember from
section 1 that the HP-41C
automatically turns itself off after 10 minutes of inactivity to conserve
battery power. When you execute the ON function
( XEQ ALPHA
ON ALPHA ), the
turn-off feature is disabled and the HP-41C will no longer automatically
turn itself off. The ON function stays in effect
until you turn the HP-41C off.
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Power OFF
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When executed from the display or in a program, the OFF
function simply turns the HP-41C power off.
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PRGM Mode
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PRGM , which toggles the HP-41C in and out of program
mode, can only be executed by pressing the PRGM key
on the HP-41C keyboard. Ther is no display execution form of
PRGM . In addition, PRGM
cannot be recorded as an instruction in a program.
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ALPHA Mode
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The AON (ALPHA mode on) function places the
HP-41C into ALPHA mode, and AOFF (ALPHA mode off)
takes the HP-41C out of ALPHA mode. AON and
AOFF are most useful in programs. In addition, notice
that AON and AOFF perform the
same function as the ALPHA key on the keyboard.
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