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Keystrokes
30
1,,,,,,,,1
35 I
R
ISI
Display
30.0000
8,312.1306
Displaying Each Step
Simple
Programming
35
Enter origina
l
diameter
into
Y.
Key
new
diameter into X
and run
the
program.
The
answer
is
displayed in
cubi
c
feet.
In
order
to look
at this
program
.
you
need
to be able to
display
eac
h
line
.
Two
operations allow you
to
step
through program memory:
IS5TI
(single step)
and
IBSTI
(back step).
With
the increase
in
sphere vol ume
program
still
recorded in
the
calcu
-
lator,
sel lhe
PR
GM-RUN sw
itch PRGM.m:JRlIN
to
RUN and
press
[!)I
RTN
I
to
reset
the
calc
ul
ato
r
to
line
00.
Then
sw
itch
10
PRGM
mode
and press
IS5TI
once.
The
di splay
w
ill
change
1
0:
01-
31
Press
I
SST
I
again
and
the
display
will
change
to:
02-
3
Now
press
[j)
18ST
I
.
You
ca
n
see
what
has
happened
.
You
are
back
at
program
memory line 0
I. Press
001
aST
I
aga
in and
line 00 is displayed.
Pressi
ng
[!JIBSTI
agai
n
does
nothing
.
I
SST
I
d
isplays
the
con tents of the
/lext
line of
program memory
.
[!J
I
BST
1
di
splays
the
contents of
the
previous line of
program memory
.
Of
course
beca
use
these
two
keys
work in
PRGM mode, ne
ither can
be
stored
in
program memory
.
Going to a Line Number
You
can
see
that
if
you
wanted to
single step
forward from
line
00
to some remote line
number
in program
memory
,
it wou ld take a
great
dea
l
of
time
and
a
number
of presses of the
ISSTI
key
.
To make
it
easy fo
r
yo
u,
the
HP-33
E
g ives
you
another
nonrecordable
operat io
n,
I
oro I
•
nn,
that perm
its
you to go
to
any
line number of
program memory.
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