BIOS Basic I/O system. A set of routines that works closely with the hardware to support the transfer of information between elements of the system, such as memory, disks, and the monitor. Although critical to performance, the BIOS is usually invisible to the end user; however, programmers can access it.
BNC Bayonet Nut Connector. Also British Naval Connector or Bayonet Neil Consulman. A type of connector used with coaxial cables such as the RG-58 A/U cable used with the 10Base-2 Ethernet system.