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Commands
and
Statements
6-24
TRON
TROFF
10
INPUT
A,B,C
20
PRINT(A+B+C)/3
30
END
TRON
OK
RUN
[10]42,
48,
45
[20]45
[30]
OK
TROFF
OK
RUN
30,
18,12
20
Ok
WAIT
The WAIT statement instructs BASIC-80 to monitor incoming bytes from a
specified port. These bytes are tested with a mask byte, which
is
an integer expres-
sion in the range
0 to 255. The resulting bits are compared with the corresponding
bits
of
the comparison byte, also
an
integer expression in the range or 0 to 255.
If
the
I comparison byte
is
not specified, the default value
is
O.
Execution
of
program text
is
halted until the two sets
of
bits differ. When the WAIT command
is
given, the port
status
is
exclusive ORed with the comparison byte and the result
is
ANDed with the
mask byte. Execution halts until a non-zero value
is
obtained.
WAIT
port
number,
mask
byte,[comparison
byte]
WIDTH
The WIDTH command adjusts the width
of
the lines printed
at
the console to the
specified value, which
is
an expression in the range
15
to 255. The default value for
WIDTH
is
72.
WIDTH
expression
10
A$
=
"ACTION,
OHIO; WEAVERTON, VERMONT; HOLLOWAY,
CALIFORNIA"
20
PRINT
A$
30
WIDTH
15
40
PRINT
A$
50
WIDTH
72
60
END
RUN
ACTION, OHIO; WEAVERTON, VERMONT; HOLLOWAY, CALIFORNIA
ACTION, OHIO;
WE
AVERTON, VERMON
T;
HOLLOWAY,CA
LlFORNIA
Ok
BASIC-80