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Simple Programming
31
The
0
represents
x
2
which
is
located
on the
zero
digit key
.
The numbers at
the
right
of
the di splay
(
15 0
)
de signate
the
key
stored
in
that
line
at
program memory
(
CiJ~
).
Each key
o
n the keyboard except
di
git
keys,
has a two-digit keycode. Digit
keys
are
coded
0
throu
gh
9. All
ot her
keys are
coded
by
their position on the keyboard.
This handy
matrix system
allows
you to
easily
determine the
code
for
each instruct ion without using a
reference
tab le.
In
every case,
a
single
opera
ti on
(e.g.
ITJ[]I[J
,
!STol[±)
1,
1:n)'I
) uses
o
nl
y o
ne
line
of
program
me mory.
Note:
Each
operation
.
prefixed or
not,
requires
only
one line
of program
memory.
The
keys
for finding the
area of a
sphere and
their
corresponding
displays
are
shown below.
Press
each
key
in
tum and
verify the
keycode
shown
in the di
splay
.
Keystrokes
Display
[DCLE\R
I
......
I
00
Clears
program
memory.
[!J0
OI-
lS 0
[!J~
02-
15 73
~
03-
61
IGTolOO
04-
13 00
In
this
case, a
program
consist
ing
of
eight
keystrokes
takes
o
nl
y
four
lines
of
program
memory.
Problems:
I.
What would
be
the keycodes for the following
operat ions:
[!J[Y!J
,
[!JIGAOI
,
[D
I
+HM'
I
,
ISTOI(£J
1?(Answers
:
153,1523,
14 6,2351
1).
2.
How
many lines
of
program
memory
would be req
uired to
load
the followin
g sections
of
programs?
a.
21""",.1
3(£J
.
b.
IOI.ToI6I RcL I
6
0
.
c.
100IsToII
50I
sToI01IRC<.12
[!J~
0
.
(Answers:
a.
4, b.
5
,
c.
10.)
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