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Glossary
AHCI mode
AHCI is a standardized method to address the SATA controller. AHCI describes a structure
in the RAM, which contains a general area for control and status, as well as a command list.
APIC mode
Advanced peripheral interrupt controller. 24 interrupt lines are available.
ATAPI CD-ROM Drive
AT Bus Attachment Packet Interface (connected to AT bus) CD-ROM drive
Automation system (AS)
A programmable controller (PLC) of the SIMATIC S7 system consist of a central controller,
one or several CPUs, and various I/O modules.
Backup
Duplicate of a program, data medium or database, used either for archiving purposes or for
the protection of vital and non-replaceable data against loss when the working copy is
corrupted. Certain applications automatically generate backup copies of data files, and
manage both the current and the previous versions on the hard disk.
Baud
Physical unit for the step speed in signal transmission. Defines the number of transferred
signal states per second. With only two states, one baud is equivalent to a transmission rate
of 1 bps.
BEEP code
If the BIOS detects a boot error, it outputs an audible warning based on the current test
result
Boot disk
A boot disk is a bootstrap disk with "Boot" sector. This can be used to load the operating
system from the disk.
SIMATIC Box PC 627B
Operating Instructions, 06/2008, A5E00927393-02
227
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