Human Interface Link

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Human Interface Link (HIL) is a bus protocol by Hewlett-Packard for connecting various input devices to their HP 9000-series workstations. It was replaced by PS/2 in the mid-90's.

Devices can be connected in series.

The connectors are 4,6 or 8-pin SDL, with connectors keyed differently for upstream and downstream ports.

It uses 12V voltage, which is a reason why few attempts at building a converter with 5VDC microcontrollers have been attempted.

Forum threads

  • Deskthority—HP-HIL. An effort at reverse-engineering the protocol and building a converter for it.

External links