The unique 26-pin, subminiature connector manufactured by JAE used on MessagePad 2000, MessagePad 2100, and eMate devices. The port provides access to serial and AppleTalk communication, audio input and output, power, as well as automatic sensing of when a device is docked.
Also referred to as the NIC.
David Arnold: Newton Interconnect Resources
Internet Archive: PDAs: A Study in Contrasts