Epson 486SX - Manual (Page 206)

Automatic speed
The feature that enables the computer to switch automatically
from high speed to low speed when accessing a diskette drive.
Backup
An extra copy of a program, data file, or disk, that is created in
the event your working copy is damaged or lost.
Base memory
The memory in the computer below 1MB that is available to
MS-DOS and application programs-usually 640KB. Also
called conventional memory or main memory.
Batch file
A type of file that lets you execute a series of commands by
typing one command. In MS-DOS, batch files are text files with
the filename extension .BAT. In a batch file, each command is
entered on a separate line. When you type the filename,
MS-DOS executes all the commands in that file sequentially.
BIOS
Basic Input/Output System. Routines in ROM (Read Only
Memory) that handle basic input/output functions of the
operating system.
Bit
A binary digit (0 or 1). The smallest unit of computer storage.
The value of a bit represents the presence (1) or absence (0) of
an electric charge.
Boot
To load the operating system into the computer’s memory.
2 Glossary