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A further modification, "Bi-Directional", used the status pins to indicate the direction of data flow on the 8-bit main data bus; by indicating there was data to send to the host on one of the pins, all eight data pins became available for use.This proved adaptable, and led to the "Enhanced Parallel Port" standard, which worked like Bi-Directional mode but greatly increased the signalling speeds to 2 MByte/s, and later the "Extended Capability Port" version increased this to 2.5 MByte/s.1284 included all of these modes, and allowed operation in any of them.The IEEE 1284 standard allows for faster throughput and bidirectional data flow with a theoretical maximum throughput of 4 megabytes per second; actual throughput is around 2 megabytes/second depending on hardware.In 1991 the Network Printing Alliance was formed to develop a new standard.In March 1994, the IEEE 1284 specification was released.
This used the status pins of the original port to form a 4-bit parallel port for sending arbitrary data back to the host.
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Each pin is attached to some sort of actuator, a solenoid in the case of Centronics, which can pull the pin forward to strike a ribbon and the paper.