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Section 4
Function Keys
The
H
P-25 function keys
can
be used manually
or
keyed in
as
part
of
a
program. In this
section, each key is individually ex-
plained
.
To
use function keys manually
,
ensure
that the
PROM-RUN
switch
P R G M "
RUN
is set
to
RUN.
LAST X
In
add ition
to the four
stack registers that
automaticall
y store
intermed iate resu lts
,
the
H
P-25
also
conta
ins a separate auto-
matic
register,
the LAST
X
registe
r.
T
hi
s
register preserves
the value that
was
in
the
displayed
X-register before
the per-
formance
of a
function. To place the
contents
of
the LAST
X
register into
th
e
display
again
, press
c=J
.
Recovering from Mistakes
I
LAST X
I
makes
it
easy
to
recover from
keystroke mistakes,
suc
h
as
pressing the wrong function
key or
keying in the
wrong
number.
Example:
Divide
12
by
2. 157 after you
ha
ve mi staken ly d
ivid
ed
by 3. 157
.
Press
Display
12
mum
3.1578
a
I
LASH
I
o
2. 1578
1
1 2.
1
12.00
1
3 . 8 0
I
3.16
1
12
.
0 0
1
5.56
Oops!
You made
a
mistake
.
Retrieves that last
entry
.
You're back at the beginning.
The correct answer.
49
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