All the instructions to start computer are stored in BIOS (Basic Input Output System ) at ROM. Whenever computer is started BIOS checks presence and status of RAM and input & output devices like keyboard, monitor, printer, disk drives etc. After checking these devices BIOS searches operating system in different drives. On finding operating system BIOS startups the operating system and hands over control of computer to operating system.
The first instructions to be executed after power-up must be stored in non-volatile memory, that is, memory which retains its content without power.
Traditionally, read-only memory parts (ROM) would be used for this purpose. However, modern computers use more cost-efficient memory types, such as program-once read-only memory (PROM), electrically erasable program-once read-only memory (EPROM) or flash memory.
Most modern computer designs are likely to use flash memory for its cost-effectiveness, and the ability to alter its content so that fixes and improvements can be applied over time.
A Read Only Memory (ROM) section, hardware-or-firmware-coded as 0's & 1's written onto a chip on the motherboard, associated with the Basic Input-Output Services (BIOS) area
The initial start-up instructions are stored in the ROM chip. These instruction tell the computer what hardware is present, and starts up the operating system.
BIOS on the Motherboard
BIOS...which is memory in the ROM.
Catch memory
no
Most of the programs and info the CPU and computer uses to Boot are mostly from the Hard Drive. The Hard Drive is mostly where all of the instructions come from.
The chip which holds software that is used to start the computer is the BIOS. The type of chip may be ROM, EEPROM, or NVRAM.
On start up the computer fetches information from BIOS. BIOS is a ROM. After that the computer loads OS from Hard disk into the RAM.
Because - the computer needs a specific set of instructions to start -up. The instructions held in ROM initialise the hardware and instruct the computer to load the operating system (and where to find it on the hard-drive).
The computer motherboard has a BIOS (Basic In-Out System). When the power is turned on, the BIOS check the basic system, beeps if it is okay, goes looking for the harddrive (or other place the OS might be stored). Then it has the instructions to start the OS. Voila! On a PC, the operating system is stored on the hard disk; mostly in the folder called Windows, and all its subfolders.
RAM
As soon as the first electronic computer was built, it needed repair. that was the start of computer repairs.
Some is stored in ROM; most of the information is typically stored on the hard disk, from where it is loaded into RAM.
Some is stored in ROM; most of the information is typically stored on the hard disk, from where it is loaded into RAM.
BIOS is short for basic input-output system - some simple instructions permanently stored in computer ROM. In other words, the instructions are available before the computer loads information from a hard disk or similar.
When you start a computer, you get a prompt that says something like "Hit F2 to enter Setup". In this case, Setup is the information stored in the BIOS, and is located on a chip on the motherboard called the CMOS. This contains all the most basic information needed to start up the computer and tell it where the memory, hard drives, processor, etc are in order to continue starting up.