HIL bus

Not to be confused with HP-IL.

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.

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 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 be found on HP PA-RISC and m68k based machines, as well as in some early HP Vectra computers. HP-UX, OpenBSD, Linux and NetBSD include drivers for the HIL bus and HIL devices.

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.

Specification

HP-HIL Technical Reference Manual, HP P/N 45918A

External links

Starr, Robert R. (June 1987). "The Hewlett-Packard Human Interface Link" (PDF). Hewlett-Packard Journal. 38 (6): 8–12.
Hewlett-Packard. HP-HIL Technical Reference Manual (PDF). HP Part No.: 45918A.
Hewlett-Packard (1997). "hil(7) — HP-HIL device driver". HP-UX Reference Release 11.0. 5. HP Part No.: B2355-90684.
HP HIL Linux driver suite
Vectra RS/20 with HIL

Technical and de facto standards for wired computer buses

General	System bus Front-side bus Back-side bus Daisy chain Control bus Address bus Bus contention Network on a chip Plug and play List of bus bandwidths

Standards	SS-50 bus S-100 bus Unibus VAXBI MBus STD Bus SMBus Q-Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus InfiniBand UPA PCI Extended (PCI-X) AGP PCI Express (PCIe) Direct Media Interface (DMI) RapidIO Intel QuickPath Interconnect HyperTransport

Storage	ST-506 ESDI SMD Parallel ATA (PATA) SSA DSSI HIPPI Serial ATA (SATA) eSATA eSATAp mSATA SCSI Parallel SCSI SAS Fibre Channel SATA Express M.2

Peripheral	Apple Desktop Bus HIL MIDI Multibus RS-232 RS-422 RS-423 RS-485 DMX512-A IEEE-488 (GPIB) IEEE-1284 (parallel port) UNI/O ACCESS.bus 1-Wire D²B I²C SPI Parallel SCSI Profibus USB IEEE 1394 (FireWire) Camera Link External PCIe Thunderbolt

Audio	ADAT Lightpipe AES3 Intel HD Audio I²S MADI McASP S/PDIF TOSLINK

Portable	PC Card ExpressCard

Embedded	Multidrop bus CoreConnect AMBA Wishbone

Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest. Category

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