shib shankar saha

Evidence of Refference

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A relationship between an application programme the operating system and hardware

The relationship between an application programme the operating system and hardware is usually shown in the form of a stack of lawyers as shown below :

1. application

2.application program interface

3. operating system

4. device driver

5.hardware

most application needs to know how to talk to operating system which is why the operating system will provide a set of proggramming libries knows as APIs or SDKs for proggremers use whenwriting application.

the APIs sit between the operating system and the running application . the running application relies on the api to perform essential on the computer by telling the operating system what is wants to do which is why a program thats is written to use Windows Vista APIs will not run on an Apple Mac without some kind of emulation or help.

Because there are so many different pieces of hardware , it would be impossible for an operating system to support them all . thats why hardware manufactures will write device drivers for different operating system , so the operating system knowns how to talk to the hardware .

Description of boot process

System of boot process:

in order for a computer to successfully boot, its bios, operating system and hardware components must should be working properly. failure of any of those three elements will likely result in failed boot sequence.

when the computer power is first turned on , the CPU intializes itself,which is triggard by a serious

of lock ticks generated by the system clock. part of the cpu intaliziation is to look at the system ROM BIOS is the first instruction to start up programme . the ROM BIOS store is the first instruction which is the instruction to run the power on self test. post begins the check of BIOS chip and then test CMOS RAMif the post does not detecta bettery failure it then continious the CPU failure checking the hardware device, secondary storage device , pan drive , floppy drive,ports and other hardware device.

once the post has determined that all component are functioning properly and the cpu has succesfully initialized the BIOS looks for an os to load.

the bios tipycally looks to the CMOS chip to tell it where to find the OS and most pcs and the os loads from the c drives on the hard drive even though the BIOS has the capability to load the

os from a floppy disk.looking to the appropiate boot drive the bios will first encounter the boot record , which tell it when to find the begining of the os and the programme file that will intialize the OS.

Once the os intialize the BIOS copies its file into memory and rhe OS basically takes over controll of the boot process . now in controll the os perform the inventory of the system the memory and memory ability and loads the device drivers that its neds to control the pherepheral device such as a printer ,scanner , optocall device, mouse and keyboard.

Computer operating system function

the operating system is the core software component of ur computer. if perform many function and is , in very basic term, an interface between your computer and outside world . in the section about hardware a computer is described as consisting of several component parts including your monitor, keyboard and other part.the operating system provides an interface to this part usin what is refferd as drivers