Filter
Top Products
1.
105
reason,
NLQ characters can contain up to 23 dots in the horizon-
tal direction.
Fundamentally, the process to define and print downloaded
NLQ characters is the same as for draft characters, except that
you must supply about four times as much character data, and
‘you must design the character with the two passes of the print
head in mind. There are small differences in the way
the at-
tribute information is processed also.
In the draft quality mode the attribute byte carries the
descender data, and specifies the start and end printing col-
umns. In the NLQ mode, the first bit also carries the descender
data as with the draft characters, but the next three bits
describe the character’s left space, and the last four bits
describe the right space. Appropriate allocation of data in these
seven bits lets you place the character where you like within the
grid, with the restriction that the character must be at least 9
dots wide.
Use the grid in Figure 7-6 to help plot the data. Due to the
two-pass process, NLQ characters can contain up to 16 dots ver-
tically. ml to m23 are the data for the first pass, and m24 to
m46 are the data for the second pass.
128
128
64
,,
64
I
1
I I
I
32
I
ASCII Code:
Descender:
Left space:
Right space:
MO = Descender * 128
+ (Left * 16) + Right
I
Figure 7-6. Use this grid (or one similarto it) to define your own
NLQcharacters.