External Display Port
The 12-inch PowerBook G4 has a mini-DVI port that supports DVI, VGA, and TV signals by means of adapters. The mini-DVI to video adapter connects an external video monitor or projector and must be purchased separately. A mini-DVI to VGA adapter and a mini-DVI to DVI adapter are included with the 12-inch PowerBook G4.
Note: When a dongle is used to attach a display, connect the dongle to the display before plugging the dongle into the computer.
The computer detects the type of adapter connected to it and programs the graphics IC to provide the appropriate type of video signals, as shown in “Table 3-12.” “Table 3-11” provides a list of supported resolutions for analog monitors.
Adapter type | Video signals | Connector type(s) |
|---|---|---|
DVI | TMDS | DVI-D |
VGA | RGB | VGA 15-pin miniature D-type |
Video | Composite and S-video TV signals | RCA and S-video |
In mirror mode and extended desktop mode, the 12-inch PowerBook G4 supports up to 1024x768 pixels on the built-in display and up to 2048x1536 on an external display, both showing millions of colors. The settings for the resolutions are selectable in System Preferences.
Composite video and S-video signals can be displayed on either an NTSC display or a PAL display. When a display is connected by way of the video adapter, the computer detects the type of adapter and enables the composite and S-video outputs. The settings for the resolutions and standards (NTSC or PAL) are then selectable in System Preferences.
In mirror mode, the video output mirrors the flat panel display: internal and external video share the same buffer, and the hardware sends the image to both displays.
In this section:
Mini-DVI Connector
Older Monitors Not Supported
Mini-DVI Connector
The connector pins are identified in “Figure 3-8.”
The 12-inch PowerBook G4 detects the type of display adapter that is plugged in and programs the graphics IC to route the appropriate video signals to the connector.
The signal assignments on the mini-DVI connector are shown in “Table 3-13.” The cable detect function on pin 25 is implemented by connecting pin 25 to +5V in the adapters. The computer detects which adapter is present by reading its EDID (Extended Display Identification Data) via DDC. The EDID for video is in the adapter; the EDID for VGA and DVI are in the display.
Older Monitors Not Supported
The computer supports current video monitors and is compatible with older monitors that use DDC for monitor identification. The detection scheme on some older monitors are not supported and will use a default configuration, including the following Apple monitors:
Multiple Scan 17
Multiple Scan 20
AudioVision 14
Apple Hi-Res RGB
Apple 16" Color
Apple Hi-Res Monochrome
Macintosh 12" RGB
Last updated: 2005-02-04
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