GraphicsPrintingAppendix —C
60 PK80Series 80-Column PrinterUser’s Manual
Graphics Overview
Graphics printing proceeds at the same rate as condensed printing. Print-
ing at higher densitydoes require two passes per line.

Pin Labels

The graphics mode requires a method to tell the pr inter which pins to fire
in each column. Since there are 256 possible combinationsof eight pins,
you need a numbering system that allows you to use a single number to
specify which of the 256 possible patterns you want.
S128 S4
S64 S2
S32 S1
S16 SNot Used
S8
Vertical spacingbetween dots is 1/72”.
You can fire any combination of pins by adding the appropriate values to-
gether. To fire any one pin, send its corresponding number. To fire mor e
than one pin at the same time, add up the numbers of the pins and send
the sum to the printer. For example, you fire the top pinby sending 128,
or fire the bottom pin by sending 1. If you want to fire both the top and
bottom pins, you send 129 (128+1).

Graphics Command Format

There are several differentgraphics commands offering a variety of hori-
zontal dotdensities and printing speeds. The format is similar for all the
commands. Each command is anescape sequence cor respondingto the
graphics mode, followed by n1 and n2 to specify the number of columns
reserved for graphics.

Column Reservation Numbers

Even in 60 DPI graphics mode, one 8” line can accommodate480 col-
umns of graphics; in 240 DPI graphics mode (quadr uple-density), almost
2000 columns can fit on the same 8” line. Sincethe pr inter doesnot use
decimal numbers larger than 255, the graphics commands use two num-
bers for reserving columns.
Because the commands are set up for two numbers, you must supply both,
even if you need only one. When you need fewer than 256 columns, it is
easy to determine n1 and n2.n1 is the number of columns you are reserv-
ing and n2 is zero. For example, tosend data for 200 columns of graphics,
n1 is 200 and n2 is 0.
For 256 or more columns of graphics data, n2 is the number of complete
groups of 256 columns, and n1 is the number of leftover colu mns. For
example, for 1632 columns of graphic data, n1 is 96 and n2 is 6 as
96 + (6 * 256) = 1632.