(Hewlett-Packard Human Interface Link
), not to be confused with the HP-IL
, 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
The HIL bus is a daisy-chain
of up to 7 devices, running at a raw clock speed of 8 MHz. 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.
HIL buses can still be found on HP PA-RISC
and one particular model of m68k server. Unix drivers are available.
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
A HIL to PS/2 converter is available, namely the HP A4220-62001.
- HP-HIL Technical Reference Manual, HP P/N 45918A