HDI-45 is the third onboard connector from the top along the left rear edge of this Power Macintosh 8100.

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)[1] 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.[2][3]

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.[4] 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.[1]

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

See also

References

  1. 1 2 Kan, Steven. "PowerMac 6100 Graphics Hardware". kan.org. Retrieved 1 February 2023.
  2. ↑ "Artifact Details: Integrated Desktop Cable (IDC)". Computer History Museum. Retrieved 1 February 2023.
  3. ↑ "AudioVision 14 Display: Q & A". Apple Support. February 19, 2012. Retrieved 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.
  4. 1 2 "Power Macintosh Pinouts, Article ID 14703". Tech Info Library. Apple Computer. July 29, 1998. Archived from the original on May 29, 2000.
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