Radio Shack TRS-80 Model III - Page 225

APPENDIX
(Tests
-
Conditional
Statements)
IF exp-1
THEN
statement-
1
ELSE
statement-2
Tests
exp-1:
If True,
execute
statement-1
then
jump
to
next
program
line
(unless
statement-1
was
a GOTO).
Ifexp-J
is False,
jump
directly
to ELSE
statement
and
execute
subsequent
statements.
(Graphics
Statements)
CLS
Clear Video
Display
RESETfx.vJ
Turn off
the
graphics
block
with
horizontal
coordinate
x
and
vertical
coordinate
v,
0<
=
X<
1
28
and
0<
=
Y<48
SET
(x,y)
Turn on the
graphics
block
specified
by coordinates
x
and
v.
Same argument
limits
as RESET
(Special
Statements)
POKE location,
value
Load value
into memory
location
(both arguments
in
decimal
form)
0<
=
value<
=
255.
OUTport,
value
Send
value
to port
(both
arguments
between
and
255
inclusive)
IF
A
=
0THEN
PRINT
"ZERO"
ELSEPRINT-NOTZERO"
160-1
CLS
RESET
(8
+
B,
11)
186
186
SET(A*2,B
+
C)
185
POKE
15635,34
POKE17770.A
+
N
189
OUT
255,10
OUT55,A
189
215