HP-IL

Hewlett -Packard Interface Loop (HP -IL) is a technology developed by Hewlett -Packard in the early 1980s interface for pocket calculators and micro- computers. Initially designed for the HP -41C, HP- IL was also used in the HP -71 and HP -75. The necessary driver software was either already in the computer or on the Einsteckkassette, which also contained the hardware of the interface. Numerous devices have been developed by HP and other manufacturers for HP -IL, including thermal and inkjet printers, tape drives, instrumentation, video outputs, etc.

HP -IL used a current loop, connecting all the devices together again and ended on source computer. They advanced simple calculator to full-fledged computer systems and can be used as early forerunner of USB are considered.

Devices with the HP -IL interface ( selection)

Controller

  • HP 82160A - HP -IL module for the HP -41C
  • HP 82973A - HP -IL interface for IBM PC and compatible with ISA bus
  • HP 82938A - Interface for Series 80-Desktop-Computer/-Controller
  • HP 82401A - HP -IL Module for HP - 71B
  • HP- 75C / D
  • HP- 71B
  • HP -110
  • HP -150

Interfaces

  • HP 82164A - HP-IL-/RS-232C-Schnittstelle (serial)
  • HP 82165A - HP-IL-/GPIO-Schnittstelle (generic parallel output )
  • HP 82166A - HP -IL Converter ( smaller version of the GPIO interface for embedded applications )
  • HP 82166C - HP -IL Converter Prototyping Kit
  • HP 82169A - HP-IL-/HPIB-Schnittstelle (bidirectional)
  • HP 82985A - HP-IL/NTSC-Video (monochrome)

Periphery

  • HP 9114A / B - Floppy Drive
  • HP 82161A - cassette deck
  • HP 82162A - Thermal printer (HP- IL version of HP 82143A printer for the HP -41C )
  • HP 82163A - Video Interface
  • HP 92198A - 80 - line video interface ( Mountain Computer )
  • HP 82168A, 92205M - acoustic (modems )
  • HP 82905A / B - Printer
  • HP 2225B - ThinkJet printer
  • HP 7470A - Graphic Plotter (Opt. 003 HPIL interface)
  • HP 2671A / G - Alphanumeric graphic thermal printer

Test instruments

  • HP 1630 and HP1631 - ( Can be loop controller ) Logic Analyzers
  • HP 3421A - Datenerfassungs-/Steuereinheit
  • HP 3468A / B - digital multimeter (HP- IL version of the HP 3478A with GPIB)
  • HP 5384A and HP 5385A - Frequency Counter with Option 003 (HP -IL)

Software

  • HP- IL- developers module ( plug-in application -ROM Module for HP -41C )
  • HP 82183A - Advanced I / O module

Foreign manufacturer

  • FSI164A - HP-IL-/RS-232C-Schnittstelle
  • Leitz IL- 41 - Theodolite interface
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