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1.
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The minimum width of a character is five dots.
Unlike standard characters that are restricted to a
height of seven dots, user-defined characters may use
eight dots vertically.
Dots cannot overlap – that is, you may not have a dot
inside a box next to one that is on a line.
You may define any position in the ASCII table, except
the block graphics area when you are downloading in
the IBM mode.
Figure 7-2.
Dots can be insideboxes or straddlethe vertical lines
of the
grid.
Photocopy the grid in Figure 7-3 to help design your new
characters. We will use a tiny representation of a chemist’s flask
for our example. We decided that our flask will not be a
“descender” (printing below the baseline of standard
characters), so a figure “l” is written next to Descender on the
grid. If your character is a descender, write a “O” next to
Descender.
Next we calculate the verticalnumerical values of the columns
of dots, and enter them underneath the grid. For example, look-
ing at Figure 7-4, we see that in the left-most column there is
only one dot, and it is sitting in the “2” box. Thus its vertical
value is 2. In the next column,’there is a dot straddling the ver-
tical line in the “l” box, and another in the “4” box; its value is
recorded as 5.