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18.1 Introduction to UARTS. UARTs (U niversal A synchronous R eceiver T ransmitter) are serial chips on your PC motherboard (or on an internal modem card). The UART function may also be done on a chip that does other things as well. On older computers like many 486's, the chips were on the disk IO controller card.
ECEn/CS 224 Â© 2003-2006. BYU. â¢ A UART may be used when: âHigh speed is not required. âA cheap communication line between two devices. is required. â¢ Asynchronous serial communication is very cheap. âRequires a transmitter and/or receiver. âSingle wire for each direction (plus ground wire) âRelatively simple hardware.