BIOS is the abbreviation for Basic Input Output System. It is a software that works from a chip incorporated in the motherboard of the computer and from which all its functions are activated.
Being an input and output system, it manages the flow of information between the computer, the operating system and its peripheral devices.
In addition to being the piece responsible for starting all hardware processes, it is also responsible for stopping the boot in case any of the functions of the system presents an error.
If all the hardware (including hard drives and RAM) work properly, then the BIOS will allow the computer’s operating system to run.
Previously, the BIOS was located in ROM or EPROM, but since the mid-1990s it began to integrate into flash memories, which allowed the end user to update it by himself, without removing the chip from the motherboard.
Although this firmware (a program that can handle the hardware) is a key piece to start the operations of any computer, currently other types of faster systems are also used, such as DMA ( Direct Memory Access or direct memory access) , for entry and exit operations.
The BIOS name was created in 1975, when said part was used for the operation of the CP/M operating system, created by Gary Kildall for the Intel 8080 microprocessor.