Epson 20 - Manual (Page 205)

Sector
A contiguous section of a disk track that provides an address at
which the computer can access data.
Self test
The initial diagnostics procedures a system performs to check its
hardware.
Serial
The type of interface that transmits data one bit at a time. See
Interface and Parallel.
Shadow RAM
The feature provided by the Equity 386 that allows you to copy
the ROM BIOS and video ROM to RAM to speed up
processing.
Software
The programs that enable your computer to perform the tasks
and functions you indicate.
Source diskette
The diskette that you are reading or copying data from during a
copy or backup operation.
SPF card
The card that controls the serial, parallel, and floppy disk drive
interfaces. The SPF card occupies option slot number 9 in the
Equity 386.
Stop bit
A signal sent in serial communications to mark the end of a
character.
Subdirectory
A directory or group of files that branches down from another
subdirectory or from the root directory.
14 Glossary