Specifications

ManualsBrandsEpson ManualsComputer equipmentOS/2 Warp 3.0 and TWAIN

Appendix A Glossary

or DSL modem is an example of a simple router

that connects the Internet to your own network.

Many routers include firewall capability to block

suspect packets from being transmitted between

networks.

routine Set of frequently used instructions. It

can be considered as a subdivision of a program

with two or more instructions that are related

functionally.

RS-232 An interface introduced in August 1969

by the Electronic Industries Association. The RS-232

interface standard provides an electrical description

for connecting peripheral devices to computers.

Originally, RS-232 (serial) ports on computers used

a 25-pin interface, but starting with the IBM AT,

most use a 9-pin interface.

RTC (real-time clock) A battery-powered clock

included on the motherboard of 286-class and

newer computers. The contents of the RTC are read

at startup time to provide the time display in the

operating system’s clock. It’s often part of the

NVRAM chip.

S/PDIF (Sony Philips Digital Interface)

Provides digital I/O on high-end sound cards and

multimedia-capable video cards. Might use either

an RCA jack or optical jack; some devices support

both types of S/PDIF connectors.

S-Video (Y/C) Type of video signal used in the

Hi8 and S-VHS videotape formats in which the

luminance and chrominance (Y/C) components are

kept separate, providing greater control and quality

of each image. S-video transmits luminance and

color portions separately, thus avoiding the NTSC

encoding process and its inevitable loss of picture

quality.

SATA (Serial ATA) A high-speed serial interface

designed to replace the current parallel ATA and

UltraATA drive interface standards. Serial ATA 1.0

uses a seven-wire data/ground cable and supports

direct point-to-point connections to host adapters

at initial speeds of up to 150MBps, which is faster

than UltraATA-133. SATA 3GB/sec hardware is now

available. See also Ultra DMA.

scan codes The hexadecimal codes actually sent

by the keyboard to the motherboard when a key is

pressed.

scan lines The parallel lines across a video

screen, along which the scanning spot travels in

painting the video information that makes up a

monitor picture. NTSC systems use 525 scan lines

to a screen; PAL systems use 625.

ScanDisk The default disk drive testing program

included with Windows 9x/Me; might be referred

to as error checking in the Drive properties screen.

Windows NT and later do not include ScanDisk,

and instead use CHKDSK to test drives.

scanner A device that reads an image and con-

verts it into computer data.

scanning frequency A monitor measurement

that specifies how often the image is refreshed.