AMI BIOS Survival Guide definition.
A special piece of software built into the motherboard of most computers that contains the basic processes executed when starting up. It is stored in memory that is not erased when the power is turned off. This is usually read-only memory (ROM), but newer computers use re-programmable "flash" ROM.
asic nput utput ystem. This is a small chip with basic code to both store settings, and tell hardware how to input/output. For a motherboard for example, it's BIOS stores all the major hardware settings for your computer.