Commodore VIC-1525 - Automatic Printing Conditions

Input
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Bytes
CHR$(8)
1
CHR$(10) 1
CHR$(13) 1
CHR$(14)
1
CHR$(15)
1
CHR$(16)/CHR$(0)/CHR$(15)
3
CHR$(17) 1
CHR$(18)
1
CHR$(26)/number of repetitions/mark data 3
CHR$(27)/CHR$(16)/CHR$(0)/CHR$(15) 3
CHR$(145) 1
CHR$(146)
1
5.
Automatic Printing
Automatic
printing will occur under 3 conditions. In order to understand
exactly
what's
happening, you have to have a little knowledge about how
your printer works.
First, each
printed
character is made from 6 rows
of
dots. Next, you
can
have up
to 80 characters per
printed
line (spaces count
as
6
dot
positions just
like
letters and
numbers).
This
means
that there are
a total
of
480 dots
per line. Now you're ready for the 3 conditions.
a. When
the
buffer
fills
up
during the input of data.
b. When your printer
"sees" that you
have
used up
more
than the 480
dots
per line that was
described above.
c. When both
a and b happen
at the same time.
What
will
happen when these
conditions occur?
a. When
the
buffer
fills during
printing, it
prints out
everything
it has
been storing
onto your
paper.
But
... it remembers where
it
stopped
printing
so that
it can continue
from that point, when
and
if
you
want
to.
Or,
it
will
print
again when you
fill
the
buffer
again.
b. When
the printer uses
up
more
than 480 dots, then
it
prints
out the
line and
then
stops
and tells
you that it's
READY
for
more
information.
c.
When
both
a and b
occur,
your printer
will "dump"
only the
first 80
characters
and
print them.
Then it will
move
to
the
next line.
At this
point,
the printer
will do
2
things:
1)
It will
hold any
characters that
have been
left in the
buffer
and
add to them;
2)
It will
give you
a
READY
for
more information
statement.
29.