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HP HP-20S - Entering Programs

HP HP-20S
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Entering
Programs
Pressing
(9]
toggles
the
calculator
into
and
out
of
Program
mode
(PRGM
annunciator
on).
While
the
HP-20S
is
in
Program
mode,
keystrokes
that
you
enter
are
stored
as
program
lines.
The
calculator
has
enough
memory
for
99
program
lines.
Each
function
and
each
digit
of a
number
occupy
one
program
line.
To
enter
a
program
into
memory:
1.
Press(#]
to
enter
Program
mode.
The
PRGM
annunciator
appears
in
the
display.
2.
Press
(&)
[J(-]
to
display
line
00.
This
sets
the
program
pointer
to
line
00
without
affecting
other
programs.
If
you
don’t
need
any
other
programs
that
might
be
in
memory,
clear
program
memory
by
pressing
[¢>]
(CLPRGM].
This
sets
the
program
pointer
to
line
00
since
there
are
no
other
lines
to
display.
3.
To
start
entering
the
program,
press
(]
followed
by
the
label
you
wish
to
assign;
A
through
F
or 0
through
9.
4.
To
enter
program
instructions,
press
the
same
keys
you
would
use
to
do
an
operation manually.
S.
End
the
program
with
a
return
instruction
by
pressing
(]
[RTN].
6.
Press
(]
to
exit
Program
mode.
Data
Input.
There
are
many
ways
to
supply
a
program
with
data.
Here
are
two
ways
to
supply
data
to
a
program
that
expects
one
data
item:
B
Enter
the
number
in
the
display
before
you
run
the
program.
B
Store
the
number
into
a
register
before
you
run
the
program,
then
recall
it
from
within
the
program.
Here
are
two
ways
to
supply
data
to
a
program
that
expects
two
data
items:
B
Enter
data
in
the
display
before
you
run
the
program
by
using
number,
number,.
The
program
can
store
number,
then
do
a
(=)
to
access
number;.
B
Store
both
items
in
registers
before
you
run
the
program,
then
re-
call
them
from
within
the
program.
6:
Programming
67

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