Printronix P9000 Series User Manual

Page 72

Graphics

4-4

the same as in the Single Density mode. Double horizontal density requires twice the

number of input data bytes to print the same length line as for Single Density. PrintĆ

ing double density reduces the printing speed by half.

Control code ESC Y selects the Double Speed, Double Density Mode.
When the Double Density, Double Speed control code is received, the data will be

printed at double the current horizontal dot density, but adjacent dots are not

printed. Since Double Density graphics are printed at half speed, Double Speed,

Double Density graphics are printed at the same speed as are Single Density graphĆ

ics.

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

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.

n2 =

700/256 = 2

n1 =

700-(2x256) = 700-514 = 188

The program statement is: ESC K (188)(2)(DATA)

NOTE: Depending on the host computer system, it may be necessary to include a width

statement within the BASIC program.

The maximum number of data bytes that can be included in the DATA portion of the

program statement (when using 132 column paper) varies according to the operating

mode: