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User-defined Characters
Data numbers
The bits within each byte have values of 1, 2, 4, 8, 16, 32, 64,
and 128. In the vertical column of dots, the bits are arranged so
that the most significant bit (which has a value of 128) is at the
top and the least significant bit (which has a value of 1) is at the
bottom.
The next illustration shows how to use this method to calculate
the data numbers for the example character. On the left side of
the figure, the data numbers are calculated for the middle
column. The value of each byte is calculated by adding the
values of the rows where dots appear. The right side of the
figure shows the whole character with the three data numbers
for each column indicated at the bottom.
This manual uses decimal numbers because the example
programs in this manual are written in BASIC and everyone is
familiar with decimals. The data you send to your printer,
however, can be in any form (binary, decimal, hexadecimal) that
you can use with your programming language.
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