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210
Appendix B: Stack Lift and the LAST X Register
Disabling Operations
Stack Lift. There are four stack-disabling operations on the calculator.
These operations disable the stack lift, so that a number keyed in after one
of these disabling operations writes over the current number in the
displayed X-register and the stack does not lift. These special disabling
operations are:
Imaginary X-Register. A zero is placed in the imaginary X-register when
the next number following v, z, or w is keyed or recalled into
the display (real X-register). However, the next number keyed in or recalled
after − or ` does not change the contents of the imaginary X-
register.
Enabling Operations
Stack Lift. Most of the operations on the keyboard, including one-and two-
number mathematical functions like x and *, are stack-enabling
operations. This means that a number keyed in after one of these operations
will lift the stack (because the stack has been ―enabled‖ to lift). Both the
real and imaginary stacks are affected. (Recall that a shaded X-register
means that its contents will be written over when the next number is keyed
in or recalled.)
T
Z
Y
X
Keys:
(Assumes
stack
enabled.)
*
Refer to footnote, page 36.
v `
t
z
y
x
4
Stack
lifts.
z
z
y
x
4.0000
4
4.0000
v
Stack
disabled.
w
y
x
4.0000
3
No stack
*
y
x
3
lift.
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