Epson LQ-850 User Manual page 208

Decimal is base 10 and uses the digits 0, 1, 2, 3, 4, 5, 6, 7, 8,
and 9. (This is the most familiar system.)
Hexadecimal (hex) is base 16 and uses the digits 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, A, B, C, D, E, and F. This is frequently used by
programmers. Any decimal number between 0 and 255 can be
expressed by a two-digit hex number.
Binary is base 2 and uses only the digits 0 and 1. All information
in computer systems is handled in binary form representing
electrical signals that are on or off. A binary digit is often called
a bit: any decimal number between 0 and 255 can be expressed by
an eight-bit binary number.
Paper bail
The part of the printer that holds the paper against the platen.
Paper-out sensor
A small switch behind the platen that sends a signal when it is
not in contact with paper.
Paper tension unit
The part of the printer that fits on top of the platen to assure
proper paper-feed tension.
Parallel interface
An interface is the connection between the computer and the
printer. There are two types: a parallel interface transmits data
one character or code at a time, and a serial interface transmits
data one bit at a time.
Parity
Parity is a method for a computer and printer to check the
reliability of data transmission.
Pitch
Indicates the number of characters per inch (cpi) For example,
10 pitch printing is 10 cpi.
Platen
The black roller that provides a backing for the printing.
Glossary
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