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Graphics PrintingAppendix —C
67PK80 Series 80-Column Prin ter User’s Manual
User-Defined Characters
To maintain 6820 Printer graphic compatibility, the PK80 Printer must
also support user-defined characters. User-defined characters allow for the
design of:
S New alphabets and typefaces
S Mathematical and scientific symbols
S Graphic patterns to serve as building blocks for larger designs
User-defined characters are stored in temporary memory (RAM). RAM-
based definition, or redefinition, of standard characters is only allowed
when the default SBCS code page is selected. There is no method to rede-
fine characters in the other code pages since unique code pages c an be
created and loaded into the printer f ont memory (FLASH) for use. The
following codes deal with user defined character s and their selection into
memory
ESC : — Copy ROM to RAM
This command sequence copies the char acters from ROM into RAM so
that a complete u ser-defined character set is created by editing selected
characters. This is helpful when user-defined character sets are selected so
that all characters are defined. This eliminates the need to unselect the
user-defined character set when printing characters that were not defined.
This command is only available when the default SBCS character set is
selected.
Note: The three sets of zeros f ollowing the ESC : are part of the com-
mand.
Hexadecimal Format
1b 3A 00 00 00
ESC & — Define User- Defined Characters
This command sequence allows characters to redefine in the currently se-
lected mode. Use this command in draft mode only. Any character from
0–255 may be redefined. Value k1 is the character code of the first ch arac-
ter to redefine. Value k2 is the character code of the last character to de-
fine. Value k1 may equal k2 if only one character code is defined.
For each character defined, supply 12 bytes of data. The first byte (s1)de-
scribes the character format. The bottom four bits are the end position in
the character grid. The next three bits represent the start position in the
grid. Bit 7 represents whether the character uses the top eight pins or the
bottomeightpinsoftheprinthead.Whenbit7=0thecharacterusesthe
top eight pins. When bit 7 =1, the bottom four bits are used.
The start and end positions are ignored during character imaging but must
be accurate to redefine the character code.