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If you select near letter quality,
the character
box is the same size but
now has 16 (high) x 23 (wide) dot positions.
Each dot is represented
by two
adjacent
sharp signs, occupying
its own position
and the position
to the right.
This reflects the fact that the printer
still cannot
print horizontally
adjacent
dots, but that even skipping
every other dot, the dots appear joined
when
printed.
A near-letter-quality
character
is represented
by 46 bytes of dot data,
two bytes for each column.
Near-letter-quality
characters
are printed
in two
passes of the print head, the paper scrolling
half a dot up between the passes.
The first 23 bytes of dot data represent
the first pass;
the next 23 bytes
represent
the second pass. In each column
the first, third, fifth, . . . dots belong
to the first-pass
byte and the second,
fourth,
sixth, . . . dots belong
to the
second-pass
byte.
A maximum
of 78 near-letter-quality
characters
can be defined.
The file created
by this program
contains
the following
printer
com-
mands:
1.
< ESC > ":" < 0 > < 0 > < 0 > (standard
mode) or < FS > ":" < 0 >
< 0 > < 0 > (IBM mode)
to copy the printer's
regular
characters
into
download
memory.
If you leave a download
character
undefined,
the
regular
character
will be printed.
2.
<ESC>
"x" <O>
or <ESC>
"x" < 1 > to select draft or near letter
quality.
3.
One <ESC>
"&" <O>
<cc>
<cc>
<a>
<pl>
. . . command
for
each character
defined.
< cc > is the character
code, < a > is the attribute
byte, and
<pl
> . . . are the 11 (draft)
or 46 (near letter quality)
bytes
of dot data. This program
uses only the most significant
bit of the at-
tribute
byte. It does not set the other bits, which are concerned
with
proportional
spacing.
This program
is coded in Microsoft
BASIC for IBM-PC.
The WIDTH
255 command
in line
1010 means
infinite
line width
and
prevents
the
computer
from inserting
unwanted
line feeds in the character
data.
Some
versions
of BASIC do not need the WIDTH
command.
Check your BASIC
manual
and make any changes
necessary.
92
-.
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