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D-2 Appendix D—Character Sets
The basic single-code operations are standard throughout the printer
industry. The groupings of basic operations for character sets are called
control code maps. (One common control code map is the ASCII
*
control
code map.) There are slightly over 40 control code possibilities, of which
a maximum of 32 or 33 control codes are ever assigned at any one time
to a character set. For a 7-bit data byte, that leaves about "128 - 32 = 96"
codes for characters.
The printer can print 428 different characters contained in a built-in ROM
character library.
Most printers, including this one, use groupings of these ROM-based
characters called character maps. The character maps make assignment
of characters from the character library to the character set easier and
more standardized between printers. One or more character maps can be
assigned to make up the completed character set. An example of a
standard character map is the 96-character ASCII map.
The standard ASCII character set, with control and character code
assignments, is shown on Pages D-6 and D-7. Most character and
control code mappings are variations of this standard character set for a
7-bit code. The ASCII character set covers the standard American
computer keyboard.
*
American Standard Code for Information Interchange