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D-4 Appendix D—Character Sets
TERMINOLOGY
Terminology used to describe character sets varies widely between IBM,
Epson, and DEC. Terminology used in this manual is internally consistent
and follows standard usage where possible. The terminology used to
describe character sets is defined below:
Character.
A printable pattern composed of dots. Letters, numbers,
punctuation marks, graphic shapes, and all other symbols are characters.
A blank space is also a valid character.
Character Library.
A defined group of printable characters stored in the
printer. The printer contains one main, ROM-based character library
when shipped from the factory.
Character Source.
The location of character libraries: ROM or RAM.
Control Code.
A single byte of information that starts, stops, or modifies
printer action.
Mapping.
Process of assigning characters and control codes to data
bytes.
Character Set.
A complete assignment of control codes and printable
characters for all data bytes.
Code Page.
A predefined IBM character map.
Character Map.
An assignment of printable characters used in creating a
character set.
Control Code Map.
An assignment of control codes used in creating a
character set.