 Similarly, a quadruple UART or "QUART", combines four UARTs into one package, such as the NXP 28L194.An octal UART or "OCTART" combines eight UARTs into one package, such as the Exar XR16L788 or the NXP SCC2698.Modems for personal computers that plug into a motherboard slot must also include the UART function on the card.