Printronix P3000 Series - Manual (Page 66)

Graphics 4–4
•
Control code ESC Y selects the Double Speed, Double Density Mode.
When the Double Density, Double Speed control code is received, the data will print at dou-
ble the current horizontal dot density, but adjacent dots are not printed. Since Double Den-
sity graphics are printed at half speed, Double Speed, Double Density graphics are printed
at the same speed as are Single Density graphics.
•
Control code ESC Z selects the Quadruple Density Mode.
When printing Quadruple Density graphics, the printer pairs adjacent quadruple density Bit
Image bytes. The compounded data is then printed in the Double Density mode.
Bit Image Programming Format
•
The general Bit Image expression is:
ESC CC(n1)(n2)DATA
where:
ESC = the Serial Matrix compatible header
CC = K, L, Y or Z to select dot density
(K=single, L=double, Y=double density, double speed
Z=quadruple density)
n1, n2 = n1 + 256 n2 defines the number of data bytes to follow
DATA = the dot pattern bytes
•
The syntax of the Bit Image expression must be correct.
•
The expression must include the appropriate dot density control code, the number of bytes
of data to be plotted, and the data itself.
•
The number of data bytes and the n1, n2 definition must be equal.
•
Any characters following n1 and n2 will be interpreted and plotted as data until the n1, n2
definition is satisfied.
•
If n1 = n2 = 0, then control codes K, L, Y, or Z are ignored.
= 700 bytes of data; 2 sets of 256 with a 188 remainder
= 188–byte remainder
The program statement is: ESC K (188)(2)(DATA)
n2 = 2 (700
÷
256)
n1 = 188
NOTE: Depending on the host computer system, it may be necessary to include a width
statement within the BASIC program.