MIO type Jetdirect cards were also used for network connectivity on some HP/Agilent laboratory equipment such as the 6890A and 6890 Plus series of gas chromatographs. The following year the team applied the technology to the legacy accessory slot on the LaserJetIIs and IIIs XIO (Extended Input/Output). Initially, a printer needed a separate card for each protocol, such as TCP/IP, IPX/SPX, AppleTalk, or DLC/ LLC.
The initial MIO interface card had Ethernet and Token Ring physical layer variants and used various networking protocols over an AUI/ BNC connection. Jetdirect is based on HP's MIO (Modular Input/Output) interface, which was designed from the ground up with the IIIsi to create a mainstream full function high performance networked printer. HP Jetdirect was first introduced in March 1991 (code named QuickSilver) with the LaserJet IIIsi network printer (code named Eli).
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