operating system some imp definitions

5
BIOS Stands for basic input output system. The BIOS software is built into the PC, and is the first software run  by a PC when powered on. The fundamental purposes of the BIOS are to initialize and test the system hardware components, and to load a  bootloader  or an operating system from a mass memory device. The BIOS additionally provides abstraction layer for the hardware, i.e. a consistent way for application  programs and operating systems to interact with the keyboard, display, and other input/output devices. Variations in the system hardware are hidden by the BIOS from programs that use BIOS services instead of directly accessing the hardware. Modern operating systems ignore the abstraction layer provided by the BIOS and access the hardware components directly.

Upload: moni-jain

Post on 03-Jun-2018

221 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Operating System some imp definitions

8/12/2019 Operating System some imp definitions

http://slidepdf.com/reader/full/operating-system-some-imp-definitions 1/5

Page 2: Operating System some imp definitions

8/12/2019 Operating System some imp definitions

http://slidepdf.com/reader/full/operating-system-some-imp-definitions 2/5