<Li> HIPPI High Performance Parallel Interface </Li> <Li> IEEE - 488 (also known as GPIB, General - Purpose Interface Bus, and HPIB, Hewlett - Packard Instrumentation Bus) </Li> <Li> PC Card, previously known as PCMCIA, much used in laptop computers and other portables, but fading with the introduction of USB and built - in network and modem connections </Li> <Ul> <Li> Controller area network ("CAN bus") </Li> <Li> eSATA </Li> <Li> ExpressCard </Li> <Li> Fieldbus </Li> <Li> IEEE 1394 interface (FireWire) </Li> <Li> Lightning </Li> <Li> RS - 232 </Li> <Li> RS - 485 </Li> <Li> Thunderbolt (interface) </Li> <Li> USB Universal Serial Bus, used for a variety of external devices </Li> </Ul>

What are the bi-directional buses in a computer system