Glossary

portion of the data block.

SYN

Synchronous Idle control character transmitted when the line is idle in synchronous transmissions.

Synchronous

A data transmission in which the time between characters is fixed by synchronising the transmitting and receiving communications equipment. The clock signal is typically derived from the data stream in order to maintain synchronisation.

Sysop

System Operator. This is the person or organisation who controls and maintains a videotex or bulletin board system. Most bulletin board systems display the name of their individual sysops when you first log on.

T

Telecommunications

The transmission of information across long distances, such as over telephone lines.

Tele-downloading

See Software Downloading.

Teleload

See Software Downloading.

Teletext

A non-interactive information system that was the predecessor to videotex systems. Teletext terminals consist of a specially modified television set and keypad to provide 24 lines of 40 column colour text and graphics. Connection is made to teletext systems by specially assigned television broadcast channels, hence the need to use a television set. Videotex terminals cannot access the information contained in a teletext system.

Terminal

An input/output device consisting of a typewriter-like keyboard and a display device, used for communicating with a large computer. Any device capable of sending and/or receiving data over a communications channel.

Terminal Emulation

Refers to the type of ASCII terminal your software will imitate (the control characters used to perform certain screen and cursor movement tasks vary from one terminal to another).

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