Re: BIOS startup ??

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Thanks for your reply Kam;

On Sun, 2007-08-19 at 10:23 -0800, Kam Leo wrote:
> On 8/19/07, Michael Harpe <mharpe79@xxxxxxxxx> wrote:
> > The things that happen at power-up on most any modern computer are pretty
> > much the same. It's dictated by the need to start in an orderly, known
> > fashion every time. The idea of bootstrap programs go all the way back to
> > the very early days of computers.
> >
> > When you push the power button, the system power supply control logic senses
> > the closed switch and starts powering up the motherboard. On the motherboard
> > there is logic that brings up the chips on the board in the proper sequence.
> >
> > Once the CPU is powered up properly, the logic on the chip senses that a
> > power on reset has occured. The CPU logic is setup in a specific way such
> > that the chip starts in a prescribed manner each time. This is the key to
> > the whole process.
> >
> > What happens next varies by according to the individual chip architecture
> > but in general this is where the BIOS gets involved.
> >
> > The BIOS (BIOS means Basic Input Output System) resides in a EEPROM or FLASH
> > EPROM on the motherboard. 
It's been two or three years since I read my stuff on BIOS, so I
probably got it wrong or out of date.  I will re-read.

> This chip contains the program that gets the
> > machine started along with the low-level routines that interface the
> > operating system with the hardware on the motherboard. The CPU starts by
> > loading an address from the last (or first) few bytes of this ROM and
> > jumping to that address thus starting the boot process.
> >
> > What happens next is implementation dependent but basically consists of
> > setting the machine up to run an operating system and then loading the boot
> > block off of the selected boot device. This is usually the very first sector
> > of the hard disk.  Once this is completed the same thing happens again, the
> > BIOS loads the program into RAM and jumps to it.
> >
> > Now we're into the loader for the operating system. The loader does more
> > preparation for running the OS and loads more of the OS into RAM. The next
> > step loads what's called the kernel, which is the core operating system.
> > From here you're running the operating system, be it Windows, Linux,
> > whatever.
> >
> > I hope this helps!
> >
> > Mike Harpe, N4PLE
> > Sellersburg, IN
> >
> 
> If you want to know more try this site: http://computer.howstuffworks.com/
> How a BIOS works is presented in this article:
> http://computer.howstuffworks.com/bios.htm
> 
Kam, I tried to be specific so as not to waste your time with answers I
already know.  BIOS - I got. (Allowing for a double check).  Power on -
I don't got.

-- 
Regards Bill


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