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As you can see, the number in the displayed X-register is copied
into Y. (The numbers in Y and Z have also been transferred to
Z and T, respectively, and the number in T has been lost off the
top of the stack. But this will be more apparent when we have
different numbersin all four registers.)
Immediately after pressing [EXjisity , the X-register is prepared
for anew number, and that new number writes over the number
in X. For example, key in the number 543.28 and the contents of
the stack registers change. . .
... fromthis . .
. . . to this.
T
0.00
T
o0.00
Z
0.00
Z
0.00
Y
314.32
Y
314.32
X
314.32
Display
X
543.28
Display
replaces any number in the display with zero. Any new
number then writes over the zero in X.
For example, if you had meant to key in 689.4 instead of 543.28,
you would press [¢Bd now to change the stack . . .
... fromthis . .
. « . to this.
T
0.00
T
0.00
Z 0.00
Z
0.00
Y
314.32
Y
314.32
X 543.28
Display
X
|0.00
Display
and then key in 689.4 to change the stack . .
... fromthis ..
. . . to this.
0.00
0.00
314.32
689.4
Display
Notice that numbers in the stack do not move when a number
is keyed in immediately after pressing
or [€¥3 . (How-
ever, the numbers in the stack do lift when a new number is
keyed in immediately after pressing [ .)
Display
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