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HP HP-11C - Page 30

HP HP-11C
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28
Section
2:
Memory
Stack,
LAST
X,
and
Data
Storage
lost
lost
1
T+
|6
|—
Z+
e
Y+
-
X=>
|—>
Keys
=
3
ENTER
1
2
2
g
N\
a1
(roll
down),
(roll
up),
and
(X
exchange
Y).
and
rotate
the
contents
of
the
stack
registers
down
or
up
one
register.
No
values
are
lost.
exchanges
the
numbers
in
the
X-
and
Y-registers.
If
the
stack
were
loaded
with
the
sequence
1,
2,
3,
4,
the following
shifts
would
result
from
pressing
(R¥],
[9][R¢],
and
[x=1].
T
Z-
Y=
X=>
Keys
%
XZy
4
/
(LSTx](LAST
X).
When
a
numeric
function
is
executed,
a
copy
of
the
value
occupying
the
displayed
X-register
before
the
function
was
executed
is
stored
in
the
LAST
X
register.
Pressing
[g][LSTx]places
a
copy
of
the
current
contents
of
the
LAST
X
register
into
the
displayed
X-register.
(Refer
to
appendix
B,
Stack
Lift
and
LAST
X
for
a
listing
of
the
functions
that
save
x
in
the
LAST
X
register.)
For
example,
if
the
stack
was
loaded
as
shown
on
the
left,
below:
lost
T+
—>[
o
;
0
Z-
—>|
o0
/
0
Y=
—|
o 16
X=
—1
16
4
Keys
=
st
|
LASTX
=
—>E

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