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HP HP-21 - Page 30

HP HP-21
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Immediately
after
pressing
EXMEX,
the
X-register
is
prepared
foranew
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
Y
|314.32
Y
314.32
X
1314.32
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
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
. . .
from
this:
to
this:
T
0.00
T
0.00
4
0.00
Z
0.00
Y
[314.32
Y
[314.32
X
0.00
Display.
X
689.4
Display.
Notice
that
numbers
in
the
stack
do
not
move
when
a
new
num-
ber
is
keyed
in
immediately
after
pressing
or
&3
.
(How-
ever,
numbers
in
the
stack
do
move
upward
when
a
new
number
is
keyed
in
immediately
after
pressing
[[X8.)

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