IEEE 1284, the standard for bidirectional parallel printer bus support, defines two interface levels and specifies a physical and electrical interface.
Level I and Level II
The Level I interface is for devices that need reverse-mode capabilities but don’t operate at high speeds. The Level II interface is for both bidirectional and high-speed communications.
Connectors
The 1284 standard also defines connectors for use in the parallel interface. The 25-pin DB25 connector is defined as the Type “A” connector. The Telco 36, a 36-conductor, 0.085" centerline Champ connector with bale locks is defined as the Type “B” connector. The Type “C” connector is a 36-contact, 0.050" centerline mini connector with clip latches.
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