Commodore 16 User Manual page 71

SCNCLR
SCNCLH
Clears
the current screen, whether
graphics,
text,
or
both
(split screen).
SOUND
SOUND
voice
#,
frequency
control,
duration
This statement produces a
SOUND
using
one
at three voices with
a
frequency control
in
the
range
0-1023
lor a
duration ot
-
65535
60ths
oi a second
Voice
1
2
3
Voice
1 (tone)
Voice 2
(tone)
Voice
2
(white noise)
It
a
SOUND
(or
voice
N
is
requested,
and
the
previous
SOUND
tor
the
same
N
is
still
playing.
BASIC
watts
for
the previous
SOUND
lo
oomplete.
SOUND
with
a duration
of
is
a special
case.
It
causes
BASIC
to
turn oft
the current
SOUND
for that
voice
immediately,
regardless of the time remaining
on
the previous
SOUND
See
the
MUSIC NOTE
TABLE
In
the appendix
for
the frequency
control
values
that
correspond
to
real notes
EXAMPLE:
SOUND
2,
800,
3600
Plays a
note using voice
2
with
frequency
set at
800
for
one
minute
138
I
SSHAPE/GSHAPE
SSHAPE and
GSHAPE
are
used
to
save and restore rectangular
areas
of multicolour or
high
resolution
screens
using
BASIC
string variables.
The
command
lo
save an
area
Is;
SSHAPE
string variable, a1 ,bt
t.a2,b2|
stnng
variable
a1.bl
...
a2,b2
....
.Siring
name
to
save data In
.
.Corner coordinate
(scaled)
.
.Corner coordinate opposite
(at ,bl
)
(default
«s
the
PC)
Because BASIC
limits siring lengths
to
255
characters, the size of the
area
you
may
save
is limited.
The
string
size required
can be
calculatea using
one
of
(he following (unsealed) formulas:
L<mcm)
-
INT( (ABS(a1-a2)
+
1)
I
4
+
99)
•
<ABS(b1-b2>
+
1)
+
4
Uh-0
-
INT((ABS<ai-a2)
+ 1J/8+
.99) •
(ABS(b1-b2>
+
1)
+
4
(mem)
refers lo multi-colour mode;
(h-r) Is
high tesolulion
The
shape
is
saved
row
by row. The
last
four
bytes
ol
the
string
contain the
column and row
lengths less
one
(I.e.:
A8S
(a1-a2)
)
in
low/
high byte format
(if
scaled divide the lengths by
3.2 (X)
and
5.1
2 (Y)
).
The
command
lo
display
a saved shape
on
any area
of the
screen
GSHAPE
string
variable
name
[.
la.b]
[.mode]
J
string
. .
Contains shape
to
be
drawn
a.b
.
.Top
let!
coordinate
telling
where
to
draw
the
shape
(scaled
-
the default
is
the
PC)
mode
Replacement mode:
0.
place
shape
as
is
(default)
1
:
place
field
Inverted shape
2;
OR
shape
with area
3;
AND
shape with area
4:
XOH
shape
with area
(
139