Epson 4000 - Manual (Page 135)

CPU
Central Processing Unit. The primary device that interprets
instructions, performs tasks, keeps track of stored data, and
controls input and output operations. See also Microprocessor.
Device driver
A file containing instructions that allow your computer to
recognize and communicate with a device. The device may be a
printer, monitor, or other type of device.
Display adapter curd
A circuit board that controls the way a monitor displays text
and graphics, normally installed in an option slot. Also called
video card. This computer does not support optional display
adapter cards. (A VGA display adapter is built into your
computer’s main system board.)
Expanded memory
Memory that specially written MS-DOS programs can use
when an expanded memory manager program maps that
memory into an accessible area.
Extended memory
Memory above 1MB that is accessed by 386 or 486
microprocessors when they are operating in protected or
virtual mode. This memory is available to OS/2 programs, but
is available to MS-DOS only if an extended memory manager
program is installed. See also Expanded memo y.
External cache
Optional cache chips you can install on the system board to
increase cache memory.
Glossary 3