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HP HP-25 - Page 81

HP HP-25
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Merged
Keycodes
To
conserve
program
memory
when
using
prefixed
functions,
the
keycodes
for
the
prefix
and
the
function
are
merged
into
one
step.
For
an
example
of
this
press
the
second
key
of
the
program,
,
and
the
display
will
change
to:
01
15
02
The
two-number
code
01
that
has
appeared
on
the
left
side
of
the
display
designates
the
step
number
of
program
memory
that
is
being
displayed.
The
two
pairs
of
numbers
on
the
right
side
of
the
display
indicate
that
the
function
[}
has
been
recorded
inthat
step
(01)
of
program
memory.
Digits
1
and
5denote
the
£}
key.
Digits
0
and
2
denote
the[2]key.
The
operation
stored
then,
is
B}
[2)
which
is
the
x?
function.
Inevery
case,
a
single
operation
(e.g.,
{il
(=],
,
)
uses
only
one
step
of
program
memory.
Each
operation,
prefixed
or
not,
requires
only
one
step
of
program
memory.
The
keys
for
finding
the
area
of a
sphere
and
their
corresponding
displays
are
shown
below.
Press
each
key
in
turn
and
verify
the
keycode
shown
in
the
display.
Key
Display
B
[o1
15
02
a
02
15
73
03
61
In
this
case,
a
program
consisting
of
five
keystrokes
takes
only
three
steps
of
program
memory.

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