Epson 4000 - Manual (Page 137)

Main system
board
The circuit board inside your computer containing the circuitry
and components your computer needs to operate.
Math coprocessor
A device that enables the computer to process mathematical
calculations faster by using floating point numbers instead of
whole numbers.
Megabyte (MB)
A unit used to measure storage space in a computer’s memory
or on a disk. One megabyte equals 1024KB (kilobytes).
Megahertz (MHz)
A unit used to measure oscillation frequency, such as that of a
computer’s internal clock. A megahertz is one million cycles
per second.
Memory module
A small circuit board, commonly called a SIMM (single inline
memory module), that contains surface-mounted memory
chips. You can add memory modules to the main system board
to expand your computer’s memory.
Microprocessor
A small CPU on one semiconductor chip. See also CPU.
Numeric keypad
The number and cursor control keys grouped together on the
right side of the keyboard. The operation of the dual-use keys
on the numeric keypad is controlled by the NumLock key.
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