[Ilugc] How to display hello in a PC without bootstraploader and OS???!!!

Krishna foss at codelectron.com
Sun Jul 8 23:36:05 IST 2012


On Sun, Jul 8, 2012 at 7:15 PM, Karishma Balan <karishma.balan at gmail.com>wrote:

> Please answer my doubt..
> Suppose your PC do not have any OS installed.(It has bootstrap loader).
> Then,
> 1.  What will happen as an when you turn ON the system? Will it display
> anything?
> 2.  How to print a hello on monitor without any OS?
> 3. How to use computer or operate anything without any OS? If no OS is
> there, then what does it use for user interface?
>
> What is the case for above questions when there is no bootstrap loader
> also.
>
In case of X86,
The bootstrap loader will load whatever is there in the first sector  of
HDD, or Floppy or USB drive (based on the order in which it will boot up)
And verify for a signature if a valid bootloader is present. if present it
loads the bootloader and pass the control to it.

This one http://www.osdever.net/  has plenty of information about
bootloader, kernel, etc for OS development.

Hope that helps.

-Krishna


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