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The Automatic Memory Stack
39
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 numbers in
all
four registers
.)
Immediately
after
pressing
mum
,
the X-regi ster is prepared
for
a
new
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 ...
· .. from this
...
. .. to this.
T 0.00
T
0.00
Z 0.00
Z
0.00
V
314.32
V
314.32
X
314.32
Display
X
543.28
Display
rD3 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 of543
.28,
you would pressrD3 now to change the stack .
..
·
.. from this ...
. .. to this.
T
0.00
T
0.00
Z
0.00
Z
0.00
V
314.32
V
314.32
X
543.28
Display
X
0.00
Display
and
then key in 689.4 to
change
the
stack ...
· .. from this ...
. .. to this.
T
0.00
T
0.00
Z
0.00
Z
0.00
V
314.32
V
314.32
X
0.00
Display
X
689.4
Display
Notice that numbers in the
stack
do not move
when a
number
is keyed in immediately
after
pressing
mum
or
rD3. (How-
ever,
the numbers in the stack
do
lift when
a
new number is
keyed in immediately after pressing
m
.)
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