How dows a CPU know what to run at startup? Like running the boot in the first sector? It must be programmed but in what language and where are the programs data held then?

Recommended Answers

All 4 Replies

What you are asking about is the BIOS (Basic Input Output system). It is called when the computer starts and determines what hardware is connected and if the hardware is sufficient for the system to be able to boot. If not it gives errors such as my personal favorite

Key board not present Press F1 to continue

Once the BIOS determines the system has enough hardware it attempts to boot from the Primary boot device then the secondary etc. Check out this article for more info:
Click Here

Key board not present Press F1 to continue

Hahahaha lol, now thats a good one. :)

it is the operating system which manages everything

Your computer motherboard has an EEPROM that stores the BIOS and other another chip that stores the CMOS settings. The BIOS is responsible for the POST and eventually booting the hard drive. This program is written in Assembly.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, learning, and sharing knowledge.