Epson EX-1000, User Manual

Page: 72 / 192

Following the specification of the range of characters to be defined in
this command is one number (al) that specifies the width of the
character and whether it uses the top eight pins or the bottom eight pins.
The last part of the character definition is the actual data that defines
the dot patterns for each column of each character. Since a character
can use up to eleven columns, you must supply eleven data numbers
for each character even if some of the columns are blank.
An example character definition program should make the process
clear:
In line 100, the ESC x 0 command selects draft style printing. The
actual character definition starts in line 110. The two at signs (@) in line
120 are nl and n2, the range of characters being defined (in this case, a
range of one). Line 130 contains
al.
The information about the character design (which is contained in the
data statements at the end of the program) is sent to the printer in the
loop between lines 140 and 160.
This example program defines a heart and places it in the area of
RAM reserved for ASCII code 64, which corresponds to the at sign in
the characters in the ROM. The next part of the program (lines 170-210)
prints out a threeline sample. The first and third lines contain at signs;
the second line contains the heart that was defined.
Graphics and User-defined Characters
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