<Li> Read - only memory (ROM), which stores the BIOS that runs when the computer is powered on or otherwise begins execution, a process known as Bootstrapping, or "booting" or "booting up". The BIOS (Basic Input Output System) includes boot firmware and power management firmware . Newer motherboards use Unified Extensible Firmware Interface (UEFI) instead of BIOS . </Li> <Li> Buses that connect the CPU to various internal components and to expand cards for graphics and sound . </Li> <Li> The CMOS battery, which powers the memory for date and time in the BIOS chip . This battery is generally a watch battery . </Li> <Li> The video card (also known as the graphics card), which processes computer graphics . More powerful graphics cards are better suited to handle strenuous tasks, such as playing intensive video games . </Li>

Briefly describe the major components of a computer system