Epson EISA Desktop - Manual (Page 172)

Serial
The type of interface that transmits data one bit at a time. See
also Interface and Parallel.
Shadow RAM
The feature provided by your computer that enables it to copy
ROM BIOS information into the RAM area of memory to speed
up processing.
SIMM
See Memory module.
Subdirectory
A directory or group of files that branches down from another
subdirectory or from the root directory.
Switch
An option added to a command that modifies the way the
command works. Switches are usually preceded by a /
(forward slash). See also Parameter.
System diagnostics
A series of checks you can perform on your system components
to make sure they are functioning correctly.
System diskette
A diskette that contains the operating system.
16 Glossary