Epson 486SX - Manual (Page 215)

MDA
Monochrome Display Adapter. A type of display adapter that
displays text in only one color, such as green or amber.
Megabyte (MB)
A unit used to measure storage space in a computer’s memory
or on a disk. One megabyte equals 1024KB.
Megahertz (MHz)
A unit used to measure oscillation frequency (of a computer’s
internal timing clock). A megahertz is one million cycles per
second. Depending on the model you have, your computer
operates at 25 MHz or 50 MHz and can simulate an 8 MHz
operating speed.
Memory
The area where your computer stores data. Memory contents
are either permanent (ROM) or temporary (RAM).
Memory module
A small circuit board that contains memory chips. You can add
256KB or 1MB memory modules to the memory card inside the
computer to expand the computer’s memory. A memory
module is commonly called a SIMM (single inline memory
module).
Memory on card
The additional memory on an optional memory card installed
in the computer.
MGA
Multi-mode Graphics Adapter. A type of display adapter card
that can display monochrome text and color graphics.
Glossary 11