3.
Printing
Under
Program
Control
Now
that
you have
seen how
to
control the printer directly
from
the
keyboard,
it's time to control the
printer from
within a BASIC
program.
The
short BASIC
example
below would
already
be
in
the computer's
memory.
It
could have
been
placed there from the
keyboard,
a
cassette
tape, or
a floppy disk.
10
0PEN3,4
20
CMD3
36 PREPROGRAM
CONTROL"
40
LIST
3.2
The RUN
command is given
and the resulting printout is
shown
here:
PROGRAM CONTROL
10
0PEN3,4
20 CMD3
30 PRINT"PR00RflM
CONTROL"
40
LIST
RERDV.
3.3
REMEMBER
THIS!
When
using
the
LIST
command
within
a
program execution,
you must
type the
PRINT#
command to
close
the channel.
Then
type the CLOSE command to close
the file
after you
have finished RUNning the file.
Although
this
works, it
is NOT
good
programming
practice.
It is sug-
gested
that
you only use the
CMD command
and DIRECT
mode.
4.
Printing Modes and Control Codes
You
can also
use
your
printer
and the
PRINT#,
CMD and
PRINT
commands in conjunction with
CHR$ codes
to do the
following:
DESCRIPTION
INPUT CODE
Enter Graphic Mode CHR$(8)
Line
Feed
After
Printing
CHR$(10)
Carriage Return
CHR$(13)
Enter Double
Width Character Mode
CHR$(14)
Enter Standard
Character Mode
CHR$(15)
Tab Setting the Print Head
CHR$(16)
Enter
Cursor Down
Mode
CHR$(17)
19.
To Next Page
Loading...
