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Appendix C
Bit Image Graphics
The relationship between the ASCII character, its decimal value, and its bit
image plot is shown in Figure 4. All 8 bits of the data byte are used in all fonts,
but some fonts have taller and shorter characters. (You may have to adjust
the line spacing in order to print without horizontal gaps.) Data bytes are
identified by their binary, octal, hexadecimal, or decimal equivalents. These
numeric equivalents are combined in data streams to form graphic patterns
such as the one illustrated in Figure 5.
ASCII
Character
Bit image plotting is not limited to printable ASCII characters. You can print bit
image patterns for any 8-bit data byte with decimal values ranging from 0
through 255 (hex 00 through hex FF). (The ASCII character set is charted in
Appendix A.)
94
Binary
Decimal
Code
Value
Equivalent
128
64
32
16
A
=
65
=
Figure 4. Bit Image Pattern from an ASCII Character
Vertically
to
Rotated Data
Byte
MSB
8
4
2
1
Printed
Bit Image
=
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