B&R Industries Provit 5000, User Manual

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376 Provit 5000 User’s Manual
Technical Appendix • Glossary
Bootstrap Loader
A program that automatically runs when the computer is switched on or restarted. After some
basic hardware tests have been carried out, the bootstrap loader starts a larger loader and hands
over control to it, which in turn boots the operating system. The bootstrap loader is typically found
in ROM on the computer.
USB
An abbreviation for »Universal Serial Bus« A serial bus with a bandwidth of up to 12 megabits
per second (Mbit/s) for connecting a peripheral device to a microcomputer. Up to 127 devices
can be connected to the system using a single multipurpose connection, the USB bus (e.g.
external CD drives, printer, modems as well as the mouse and keyboard). This is done by
connecting the devices in a row. USB allows devices to be changed when the power supply is
switched on (hot plugging) and multi-layered data flow.
UPS
An abbreviation for »Uninterruptible PowerSupply« UPS supplies power to systems which
cannot be connected directly to the power mains for safety reasons because a power failure
could lead to loss of data. The UPS allows the PC to be shut down securely if a power failure
occurs without losing data.
UPS
Abbreviation for »Uninterruptible Power Supply« see UPS
VGA
An abbreviation for »Video Graphics Adapter« A video adapter which can handle all EGA
(Enhanced Graphics Adapter) video modes and adds several new modes.
XGA
An abbreviation for »EXtended Graphics Array« An expanded standard for graphic controllers
and monitors which was introduced by IBM in 1990. This standard supports a 640 * 480
resolution with 65,536 colors or a 1024 * 768 resolution with 256 colors and is generally used in
workstation systems.