HDI-45 connector explained

The HDI-45 was one of Apple Computer's proprietary cable-to-onboard video connectors. A 45-pin connector, the HDI stands for High-Density Interconnect.

Use

These connectors were used only in the first generation Power Macintosh computers (the Power Macintosh 6100, 7100 and 8100), specifically connecting these computers to the Apple AudioVision 14 Display, the only display to use this connector. Other Apple displays and third-party displays could be used with a special adapter for the receptacle on the computer ("Canneloni", Apple part M2681LL/A or 590-0796-A) or a breakout cable ("Calamari", Apple M1243LL/A or 590-0793-A) for the permanently attached cable to the monitor that converts this unusual port to a standard DA-15 connector.[1] [2]

Technical

In addition to carrying analog RGB video, the connector supports analog stereo audio signals (input and output), Apple Desktop Bus (ADB), and S-video input.[3] Because the AudioVision 14 Display has front-mounted connectors for ADB and audio and video, a single consolidated cable and proprietary connector was used to simplify the connection to the computer and reduce cable clutter.[4]

AudioVision HDI-45 pinout
! Pin !! Function
1Analog audio ground
2Audio input shield
3Audio input (L)
4Audio input (R)
5Audio output (L)
6Audio output (R)
7Reserved
8Monitor ID sense line 1
9Monitor ID sense line 2
10Video ground/shield (G)
11Video output (G), 75Ω
12Video input power ground
13+5V for camera
14Reserved
15
16
17
18Monitor ID sense line 3
19S-video input shield
20S-video input, luminance (Y)
21S-video input, chroma (C)
22Reserved
23Not used
24Reserved
25
26Video ground/shield (R)
27Video output (R), 75Ω
28I2C data signal
29I2C clock signal
30Reserved
31Monitor ID
32Monitor ID
33Vertical sync
34Composite sync
35ADB power, +5V
36ADB ground
37ADB data
38Keyboard switch
39Reserved
40
41Monitor ID
42Horizontal sync
43Video sync ground
44Video ground/shield (B)
45Video output (B), 75Ω

See also

External links

Notes and References

  1. Book: Artifact Details: Integrated Desktop Cable (IDC) . Computer History Museum . 1 February 2023.
  2. Web site: AudioVision 14 Display: Q & A . February 19, 2012 . Apple Support . 1 February 2023 .
    Q: What is the Integrated Desktop Cable (IDC)?
    A: It's a new high-density cable for plug-and-play set-up. The IDC replaces five cables that would normally have to run from your computer to your display to provide the same AudioVision functionality (sound-in, sound-out, ADB, video-in, video-out). Now with a single "snap" you'll be connected.
    Q: When do I need the AudioVision Adapter?
    A: It is required on all modular Macintosh models that do not have the high-density connector on the back panel of the computer. The part number is M1243LL/A. Future Apple CPU's will support the new integrated desktop cable and, therefore, will not require the AudioVision adapter..
  3. Web site: Power Macintosh Pinouts, Article ID 14703 . July 29, 1998 . https://web.archive.org/web/20000529033846/http://til.info.apple.com/techinfo.nsf/artnum/n14703 . May 29, 2000 . dead . Tech Info Library . Apple Computer.
  4. Web site: PowerMac 6100 Graphics Hardware . Kan, Steven . kan.org . 1 February 2023.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "HDI-45 connector".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.