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Stack Lift Conditions
and
Termination of Keyboard Entry
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Your HP-41C has been designed to operate in a natural, friendly manner. As
you have seen while you worked through this handbook, you are seldom required to
think about the operation of the automatic memory stack or the display—you
simply work through calculations in the same way you would with pencil and
paper, performing one operation at a time. There may be occasions, however,
such as when you are creating a program, when you want to know the effect
of certain operation upon the display of the stack.
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Termination of Digit and ALPHA String Entry
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Except for those operations used for digit entry (
· ,
CHS ,
EEX ,
USER ,
ALPHA ,
g ), all
operations in the HP-41C terminate digit entry. This means that the
calculator knows that any digits you key in after any of these operations are
part of a new number. The new number will be written over the number in the
X-register. However, depending on the particular operation, the stack may
be ‘‘lifted’’ so that the contents of the
X-register are copied into the Y-register before the new number is keyed
into the X-register.
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ALPHA entry is terminated by all other functions except
ARCL . To continue building an ALPHA string after
ALPHA entry is terminated, simply press
APPEND.
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Stack Lift
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Operations in the HP-41C are of three types with respect to their effect
on the stack. Most operations enable the stack lift. A few
operations disable the stack lift, and a few others are
neutral.
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Enabling Operations
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All operations on the HP-41C other than those listed below (under Disabling
Operations and Neutral Operations) enable the stack lift. If you key
in a number immediately following an enabling operation, the stack is lifted
and the number is entered into the display.
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Disabling Operations
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If you key in a number immediately following a disabling operation, the stack
is not lifted. Therefore, the contents of the X-register are not
copied into the Y-register before the new number is keyed into the
X-register. The disabling operations are:
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ENTER
CLX
Σ+
Σ–
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