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II
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Glossary
Off-line is a condition in which your printer can relate to itself but is unable
to communicate with your computer.
On-line is a condition in which the printer is interfaced with the computer
and is ready to receive data transmission.
Parallel transmission is a type of interface in which each byte of data is
transmitted from the computer to the printer, arranged so that each bit is sent
on a separate wire, side-by-side (in "parallel").
Peripheral is any device used by a computer to communicate, including
printers, monitors, and disk drives.
Random Access Memory (RAM) is an array of semiconductor switches that
stores information in the form of bits. RAM storage changes as the printer
performs its tasks. The RAM is the main memory that the user can alter and
might be called the "ReadlWrite Memory:' In the Gemini printers, the RAM
consists of 816 bytes of storage for data transferred from the interface circuit
to the print head circuit.
Read is to obtain data from a computer storage media or from user input.
Read-Only Memory (ROM) is a type of main memory that comes from the
manufacturer with data or programs that cannot be modified by the user.
Unlike most RAMs, the contents of a ROM are not lost by turning the power
"off:'
Resolution is the degree of detail that the user can obtain with different
printing modes. The Gemini printers offer 60 x 72 low-resolution, 120 x 144
high-resolution and 240 x 144 ultra high resolution bit image graphics.
Serial transmission is a type of communication in which each byte of data
is transmitted from the computer to the printer, arranged so that each bit is
sent on one wire, end-to-end ("serially").
Software is the set of tasks or programs that makes hardware perform
particu lar functions.
Subscripts are those characters that are printed beneath the baseline for
standard-size characters. The "2" is a subscript in H
2
0, the chemical notation
for water.
Superscripts are characters above the baseline of characters. The "2" is a
superscript in E
=
mc
2 ,
Einstein's simple equation for the relationship of
energy to mass.
Throughput is the total printing time, including data acquisition and line feed
time.
Write is to copy, generally from internal to external storage.
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