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Section 3: Automatic Memory Stack and ALPHA Register40
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...the result is placed in the X-register and is seen in the display. The
contents of the stack registers now look like this:
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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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0.0000
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X
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0.2000
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The Display and ALPHA Register
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We have just seen how you can execute a function and how the result is placed
in the X-register and seen in the display.
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But if you are in ALPHA mode, any characters you key in are placed into a
special ALPHA register als well as the display. The ALPHA register is
separate from the automatic memory stack. The automatic memory stack is
not disturbed when you key in ALPHA characters.
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To see what is in the ALPHA register, simply place the HP-41C into ALPHA mode.
In ALPHA mode, the ALPHA register is always displayed.
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The ALPHA register can hold up to 24 characters, 12 more than the display. In
any combination of full characters and periods, colons and commas, the largest
number of characters you can place in the ALPHA register is 24.
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When you key in a string of ALPHA characters longer than the display
(12 characters), the HP-41C automatically ‘‘scrolls’’
the characters through the display to the left. If at any time you wish
to see the complete contents of the ALPHA register, simply press
g
AVIEW (ALPHA view) in ALPHA mode.
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Try it now:
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SCROLL EXAM _
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CROLL EXAMP _
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ROLL EXAMPL _
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OLL EXAMPLE _
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SCROLL EXAMP
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CROLL EXAMPL
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ROLL EXAMPLE
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0.2000
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The APPEND function
( g
K in ALPHA mode) enables you to build on to a
string in the ALPHA register. You can add characters to a string already in the
ALPHA register by placing the HP-41C into ALPHA mode, pressing
APPEND
( g
K) and then key in the desired additional
characters.
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