This listing only relates to Apple Video interfaces.
The main page for Apple buses is listed on the Apple Computer Buses page.
Different types of Apple computer Video buses are listed on this page.
The Macintosh computer is a sub-type of Apple computer. The computer
monitor bus pinout for different types of interfaces is listed below. A
description is provided along with the connector pin outs. How ever, no
electrical standards or cabling information is provided.
Here is a link
to Connector manufacturers, or
Cable manufacturers, and a list of
Cable Assemblies manufacturers.
Designer Note: Watch for the reference to obsolescence in some of the bus listings below.
The Apple display connector [ADC] is an Apple proprietary interface
connector. The ADC pinout and function is similar to the DVI connector and
carries both digital and analog video signals, but the pin out is
different and the ADC uses the USB bus. The ADC Video bus has
control signals and power for an external monitor. Note: the physical
size and shape of the ADC connector is different from the DVI connector
and they will not mate together. A maximum current of 3.6 amps may be
drawn via the 25 volt power pin. Apple computers may also be found with
DVI connectors.
The
video card and type of computer determines which interface is provided.
| Pin # | Signal name | Pin # | Signal name | Pin # | Signal name |
|---|---|---|---|---|---|
| 1 | 25v Supply | 11 | 25v return | 21 | USB Data+ |
| 2 | 25v Supply | 12 | 25v return | 22 | USB Data- |
| 3 | LED | 13 | Soft Power | 23 | USB Return |
| 4 | TMDS Data0- | 14 | TMDS Data1- | 24 | TMDS Data2- |
| 5 | TMDS Data0+ | 15 | TMDS Data1+ | 25 | TMDS Data2+ |
| 6 | TMDS Data 0/5 Shield | 16 | TMDS Data 1/3 Shield | 26 | TMDS Data 2/4 Shield |
| 7 | TMDS Data5- | 17 | TMDS Data3- | 27 | TMDS Data4- |
| 8 | TMDS Data5+ | 18 | TMDS Data3+ | 28 | TMDS Data4+ |
| 9 | DDC Data | 19 | DDC Clock | 29 | Clock+ |
| 10 | Vsync | 20 | Clock Return | 30 | Clock- |
| C1 | Analog Blue Video | -- | -- | -- | -- |
| C2 | Analog Green Video | -- | -- | -- | -- |
| C3 | Analog Horizontal Sync | -- | -- | -- | -- |
| C4 | Analog red Video | -- | -- | -- | -- |
| C5 | Analog GND Return: (analog R, G, B) | -- | -- | -- | -- |
The Video Bus page provides a description of the S-Video bus.
However the S-Video standard uses a different style connector.
| Pin Number | Description |
|---|---|
| 1 | Analog GND |
| 2 | Analog GND |
| 3 | Video Y (Luminance) |
| 4 | Video C (Chroma) |
| 5 | I2C Clock |
| 6 | +12 VDC (max 250mA) |
| 7 | I2C Data |
This bus interface is obsolete.
| Pin | name | Description |
|---|---|---|
| 1 | TEXT | Video text signal from TMG; set to inverse of GR, except in double high-resolution mode |
| 2 | 14M | 14M master timing signal from the system oscillator |
| 3 | SYNC* | Displays horizontal and vertical synchronization signal from IOU pin39 |
| 4 | SEGB | Displays vertical counter bit from IOU pin 4; in text mode, indicates second low-order vertical counter; in graphics mode, indicates low-resolution |
| 5 | 1VSOUND | One-volt sound signal from pin 5 of the audio hybrid circuit (AUD) |
| 6 | LDPS* | Video shift-register load enable from pin 12 of TMG |
| 7 | WNDW* | Active area display blanking; includes both horizontal and vertical blanking |
| 8 | +12V | Regulated +12 volts DC; can drive 300mA |
| 9 | PRAS* | RAM row-address strobe from TMG pin 19 |
| 10 | GR | Graphics mode enable from IOU pin 2 |
| 11 | SEROUT* | Serialized character generator output from pin 1 of the 74LS166 shift register |
| 12 | NTSC | Composite NTSC video signal from VID hybrid chip |
| 13 | GND | Ground reference and supply |
| 14 | VIDD7 | From 74LS374 video latch; causes half-dot shift high |
| 15 | CREF | Color reference signal from TMG pin 3; 3.58 MHz |
This bus interface is obsolete
| Pin | name | Description |
|---|---|---|
| 1 | VID.GND | Video ground |
| 2 | RED | Red signal |
| 3 | GREEN | Green signal |
| 4 | VID.GND | Video ground |
| 5 | VID.GND | Video ground |
| 6 | BLUE | Blue signal |
| 7 | CSYNC | C sync |
| 8 | VSYNC | Vertical sync |
| 9 | MLB.SYNC.EN.L | Not used (reserved) |
| 10 | HSYNC | Horizontal sync |
| 11 | DAC.ISET.1 | Not used(reserved) |
| 12 | DAC.ISET.2 | Not used (reserved) |
| 13 | SND.GND | Not used (reserved) |
| 14 | SND.RIGHT | Not used (reserved) |
| 15 | SND.LEFT | Not used (reserved) |
| 16 | +5V | +5 volts |
| 17 | GND | Ground |
| 18 | SDAT | Not used (reserved) |
| 19 | SCLK | Not used (reserved) |
| 20 | +12V | +12 volts |
| 21 | -12V | -12 volts |
| 22 | Dot | Clock Scaled dot clock (scaled to 10 percent) |
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