local area network coprocessors, serial interfaces, local area network transceivers, universal asynchronous receivers/transmitters, local area network controllers, single side band speech scramblers, local area network drivers, printer adapter interfaces, timing controllers, graphics display controllers, CRT video processors, row buffers, video attributes controllers, keyboard encoders, floppy disk controllers, floppy disk data separators, logic gate cells, buffer cells, shift register cells, flip-flop cells, latch cells, multiplexer/selector cells, counter cells, decoder/encoder cells, comparator cells, arithmetic operation cells, parity generator cells, gate cells, analog cells, pad cells, analog data separators, baud rate generators, counter/timer cells, data path controllers, hard disk controllers, hard disk data separators, interface controllers, local area network interfaces, mass storage controllers, programmable communication interfaces, storage micro-controllers, system interface controllers, terminal logic controllers, universal disk controllers, universal synchronous receivers/transmitters, video display controllers, local area networks comprising computers and associated computer software, circuit boards, repeaters, active hubs, multi-port active hubs, passive hubs, hardware for mounting hubs, network testers and computer software for such testers