Printronix P9000 Series How Bit Image Graphics Are Produced

Graphics4-2
73
146
36
255
36
146
73 DECIMAL
VALUES
128
64
32
16
8
4
2
1
DECIMAL
WEIGHTS
7th BIT IMAGE DATA BYTE
2nd BIT IMAGE DATA BYTE
1st BIT IMAGE DATA BYTE
Figure 4-1. Bit Image P attern Plan
How Bit Image Graphics Are Produced
The binary data byte bit pattern for the A SCII character  A " (hex 41, decimal 65) is pictured in
Figure 4-2.
DIf
this data byte is rotated clockwise, the result is a vertical data byte pattern with the
most significant bit (MSB) at the top.
DIf each 1" or true bit is plotted, the result is a bit image plot of the A SCII character
A."
The
relationship of A SCII character, decimal value, and Bit Image plot is shown in Figure 4-3.
DThe data bytes can be identified by their binary, octal, hexadecimal, or decimal
equivalents.
These are used to generate a Bit Image pattern.
DBit Image plotting is not limited to printable ASCII characters; Bit Image patterns
can
be plotted for any 8-bit data byte with decimal values ranging from 0 to 255.
D The standard A SCII character chart and its equivalents is provided in Appendix A.
NOTE: Bit Image Graphics is recommended in the DP print mode (120 X 72 dpi). V ertiĆ
cal
density variation in other print modes may cause white horizontal bars or overlapping
of adjacent graphics lines; however , changing the line spacing can correct this problem.