Main System Board - Epson Progression User Manual

Jumper
A small moveable plug that connects two pins on a device's
circuit board. Jumpers can be used to alter the operation of a
particular function.
Key disk
A diskette containing a copy-protected program and that must
remain in a diskette drive while you use the program. See also
Copy-protected program.
Kilobyte (KB)
A unit used to measure storage space in a computer's memory
or on a disk. One kilobyte equals 1024 bytes. See also Byte.
LIM EMS 4.0
Version 4.0 of the Lotus/Intel/Microsoft Expanded Memory
Specification-a description of a capability your computer has
for supporting programs that use expanded memory. See also
Expanded Memory.

Main system board

The board built into your computer containing the circuitry and
the primary components your computer needs to operate.
Other boards, such as option cards, can be installed in the
option slots (bus connectors) on the main system board. Also
called motherboard.
Math coprocessor
An optional device that enables the computer to process
mathematical calculations faster by using floating point
numbers instead of whole numbers. This speeds up
math and graphics operations performed by programs that use
this type of calculation.
12 Glossary
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