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fundamentals ot Dot Matrix Printing
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With emphasized type, the matrix is 18 by 9 because each
column is fired twice, horizontally offset by one-half dot on the
second firing. Double-strike printing is accomplished by an 18 by
18 matrix, with the second printing vertically and horizontally
offset by one-half dot. Emphasized plus double-strike is a 36 by
27 matrix, with the additional printings offset both horizontally and
vertically.
In the double-width (“expanded”) mode, a column is printed,
the print head moves over and repeats the same column
configuration, then the print head moves over to twice-print the
next column.
Superscripts and subscripts follow the same matrix pattern
as the standard characters, but the print size of the matrix is one-
half as high.
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VERTICAL SPACING
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On most conventional typewriters, you have a choice of single,
space-and-a-half, or double spacing. Your Gemini can print lines
that are set to one-sixth inch, or one-eighth, or whatever spacing
you want in increments as small as 11144th of an inch!
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When you “initialize” your printer, Gemini is automatically
set to avertical spacing of one-sixth inch if DIP Switch l-5 is “on”
or one-eighth inch if DIP Switch l-5 is “off? One-sixth inch spacing,
which delivers six lines per inch, is the same as a standard “pica”
typewriter, and is fine for text printing.
For block graphics (each of which is up to six dots tall),
different spacing is required (or else your graphic “blocks” won’t
fit together tightly).
Anticipating that you would want to be able to adjust the
11.
vertical spacing, Gemini provides you with the following five ways
to make adjustments:
Software
Height
Vertical
Code
(Inches)
Dots
ESC “2”
116
12
ESC “0” 118
9
ESC “1” 7172
7
ESC “A”n n/72
n
ESC “3” n
n/l 44
n/2
85
k.