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Gemini User’s Manual
Gemini requires that precisely the correct number of
characters you specify with nl and n2 will follow immediately after
the n2 control code. If there are too many (or too few) characters,
unexpected and crazy things will happen.
The high-resolution graphics mode is entered by sending Gemini
the control code:
ESC “L” nln2, which selects the 120 dots-
per-inch column scan bit image
graphics mode.
-
But Gemini’s graphics capabilities don’t stop there. The Gemini-
10X/15X, with control codes ESC “y” nln2 and ESC “z” nln2, will
take you two steps beyond high-resolution graphics, and allow you
to print faster and with even greater density.
ESC “y” nln2 commands the printer to
print dual-density graphics with
double-speed. In other words, your
result will be high-resolution graphics
(as if you had used ESC ‘IL”) but they
will be printed twice as fast!
ESC “z” nln2 puts Gemini in the quadruple-
density graphics mode (even more
dots per inch). The result of this ultra-
high-resolution mode is the capacity
to print 1,920 dots in one line on the
Gemini-lox, and 3264 dots in one
line on the Gemini-15X. (See the ex-
planation of nl and n2 for ESC “K” to
define how many columns of dots
you want to print in a line.)
Firing the Pins
There are nine pins in the Gemini print head. In the graphics mode,
you can control the upper eight. For those of you with computers
that can only send seven bits (Apple II and some others), you
control the top seven pins. Let’s look at the print head again and
label the pins as follows:
92