HP HIL Adapter, which allows standard PC keyboards and mice to be added to an HIL host. Note the pass-through port on the right, which allowed other HIL devices to be daisy-chained through this one.A HP-HIL connector for keybords next to a HP-IB connector on an HP9000-310 workstation
The HP-HIL (Hewlett-Packard Human Interface Link) is the name of a computer bus used by Hewlett-Packard to connect keyboards, mice, trackballs, digitizers, tablets, barcode readers, rotary knobs, touchscreens, and other human interface peripherals to their HP 9000 workstations. The bus was in use until the mid-1990s, when HP substituted PS/2 technology for HIL. The PS/2 peripherals were themselves replaced with USB-connected models.
The HIL bus is a daisy-chain of up to 7 devices, running at a raw clock speed of 8MHz. Each HIL device typically has an output connector, and an input connector to which the next device in the chain plugs; the exception is the mouse which has only the output connector.
The HP-HIL bus uses specific 4-pin, 6-pin, or 8-pin SDL connectors, somewhat similar to the 8P8C 8-pin modular connector commonly (though incorrectly) called the RJ-45. The bus can reportedly also use a 9-pin D-subminiature DE-9 connector.
A HIL to PS/2 converter is available, namely the HP A4220-62001.
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