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HP HP-16C - The LAST X Register

HP HP-16C
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Section
2:
The
Automatic
Memory
Stack
23
lost
T|
v
|—|
v
/1h—>1h
Z1h—>1h/2h—->2h
Y2h—>2h/3h—>3h
X[2h
|.>3h43h
~[an
Keys
=
3
4
In
addition
to
[ENTER],
there
are
three
other
functions
that
rearrange
the
stack:
o
(roll
down)
rolls
the
contents
of
the
stack
registers
down
one
register.
The
number
in
the
X-register
rolls
around
into
the
T-register.
°
(roll
up)
rolls
the
stack
contents
up
one
register.
The
T-register
contents
roll
around
into
the
X-register.
®
[xxy]
(X
exchange
Y)
exchanges
the
numbers
in
the
X-
and
Y-registers.
The
LAST
X
Register
The
LAST
X
register,
another
memory
register,
preserves
the
number
that
was
last
in
the
display
before
execution
of
a
numeric
operation.*
Pressing
[9d]
(LAST
X)
places
a
copy
of
the
contents
of
the
LAST
X
register
into
the
display
(X-register).
*For
a
complete
list
of
operations
which
save
x
in
the
LAST
X
register,
refer
to
appendix
B.

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