HP HP-67 - Page 63

The Automatic Memory Stack 59
Immediately after pressing EXLEL, the X-register 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 3.00 T 3.00
Z 1.00 z 1.00
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 now to change the stack...
...from this... ...to this.
T 3.00 T 3.00
Z 1.00 Z 1.00
Y 314.32 Y 314.32
X 543.28| Display. X |o0.00 Display
and then key in 689.4 to change the stack...
...from this... ...to this.
T T 3.00
z
z
1.00
Y
Y
314.32
X
Display.
X
|
6894
Display.
Notice
that
numbers
in
the
stack
do
not
move
when
a
new
number
is
keyed
in
immediately
after
you
press
EHiEE,
B3,
or
@
EX).
However,
numbers
in
the
stack
do
lift
upward
when
a
new
number
is
keyed
in
immediately
after
you
press
most
other
functions,
including
O
G,
0
),
and
@
(x33).See
appendix
D,
Stack
Lift
and
LAST
X,
for
a
complete
Iist
of
the
operations
that
cause
the
stack
to
lift.
(If
you
follow
a
regular
function
like
or
()
with
@
ETK),
then
key
In
a
number,
the
stack
will
lift.)