Printronix P9000 Series - Manual (Page 75)

4-7 Graphics
Plot Data Byte Format
In P-Series Plot Mode, the format is as follows:
D Each data byte specifies six out of twelve dot columns.
D Using odd dot plot mode, bits 1 to 6 of the data byte address the odd-numbered dot
columns; using even dot plot mode, bits 1 to 6 of the data byte address the even-
numbered dot columns.
D Bit 6 and/or bit 7 of the data byte must be a 1" (or true) bit in the Plot mode.
D Bit 8 of the data byte is not used in the Plot mode and may be either a 1 or 0.
D The binary equivalent of the plot data bytes must be known to accurately address
specific dot positions.
As shown in Figure 4-7, a dot is printed at the location addressed by each of bits 1 to 6 in the
data byte that is set (1 or true).
1 1 1 1 1 1 0
BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8
ODD DOT PLOT DATA BYTE
LSB MSB
1 3 5 7 9 11
NOT
USED
NOT
USED
0 0 0 1 1 1 1
2 4 6 8 10 12
EVEN DOT PLOT DATA BYTE
BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8
LSB MSB
DOT COLUMN #1 OF
NEXT CHARACTER
COLUMN
DOT COLUMN
#12 OF PREVIOUS
CHARACTER
COLUMN
NOTE: IN ACTUAL
PRINTING, THESE
TWO ROWS MERGE
TO PRINT ON THE
SAME ROW.
NOTE: Bit order in this example is reversed.
NOTE: BIT 6
AND/OR BIT 7
MUST BE 1"
FOR PLOT MODE
Figure 4-7. P-Series Plot Data Byte Format