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110
l You may define any position in the ASCII table except
the control code area, but you cannot define more than
35 characters.
Photocopy the grid in Figure 7-3 to help design your new
characters. We will use a tiny representation of a picture of an
automobile for our example.
Next we calculate the vertical numerical values of the columns
of dots, and enter them underneath the grid. Looking at Figure
7-4, we see that each vertical column (which has a maximum of
24 dots) is first divided into three groups of eight dots. Each
group of eight dots is represented by one byte, which consists of
eight bits. For example, looking at Figure 7-4, we see that in the
left-most column there are five dots, and they are sitting in the
“1” box of the 1st byte, “128”, “
64”, “32”, and “16” boxes of the
2nd byte. Thus its vertical value is 1 for the 1st byte, 240 for the
2nd byte, and 0 for the 3rd byte.
2nd
byte
3rd
byte
ASCII code:
Data
1%
2nd:
3rd:
4th:
5th:
6th:
7th:
8th:
9th:
Figure 7-3.
Use this grid (or one similar to it) to define your own
draft characters.