Epson Apex 20020, 20040 User Manual page 236

Main memory
The amount of memory in the computer up to 1MB that is
available to MS-DOS and application programs. Also called
base memory.
Math coprocessor
An optional device that enables the computer to process
certain mathematical calculations faster.
Megabyte (MB)
A unit used to measure storage space in a computer's memory
or on a disk. One megabyte equals 1,048,576 bytes.
Megahertz (MHz)
A unit used to measure oscillation frequency (of a computer's
internal timing clock). A megahertz is one million cycles per
second. The Apex operates at 8 MHz or 12 MHz.
Memory
The area where your computer stores data. Memory contents
can be permanent and inalterable (ROM) or temporary
(RAM).
MGA
Multi-graphics Adapter. The type of display adapter that can
display monochrome or color text and graphics on the screen.
Microprocessor
A small version of a CPU contained on one semiconductor
chip.
Modem
A device that allows a computer to transmit signals over
telephone lines so it can send and receive data. Modem stands
for MOdulator/DEModulator.