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http://developer.apple.com/legacy/mac/library/documentation/Hardware/Develo=
per_Notes/Macintosh_CPUs-G4/iMac_Sep03/03_Input-Output/q26bc_inout.html#//a=
pple_ref/doc/uid/TP40000875-CH207-DontLinkElementID_14

Video Monitor Port

The iMac computer has a port for an external video monitor and supports vid=
eo
mirroring mode. Video mirroring mode displays the same information on both
monitors, enabling the control of a presentation on one display, while allo=
wing
an audience to watch the presentation on a second display or projector.

Due to display mirroring, the external monitor could have black borders dur=
ing
mirroring, depending on the supported timings between the two displays and =
on
the monitor=E2=80=99s selection algotithm. Both displays show full-sized im=
ages only
when the display resolution for the second monitor is set to the first
display=E2=80=99s native resolution: 1440x900 on the 17-inch display and 10=
24x768 on
the 15-inch display.

The external monitor supports user-selectable display sizes up to 1600x1200=
 at
75 Hz.

Monitor Connector

The video display connector is a 14-pin rectangular connector, Hosiden TCX3=
143,
or compatible. The connector accepts either a VGA adapter or a composite
adapter. The system requires a composite adapter to use composite output ov=
er
this connector. The connector pins are identified in Table 3-3.

Figure 3-3  Video display connector
Video display connector

The pins and signals are listed in Table 3-8. An adapter is available for u=
se
with monitors with VGA 15-pin miniature D-type connectors.
Table 3-8  Video signals for a VGA R-G-B display

Pin    Signal name
1      Ground
2      VSync
3      Hsync
4      Red return
5      Red video
6      Green return
7      Green video
8      +5 volts
9      Blue video
10     DDC data
11     DDC clock
12     Ground
13     /Cable detect
14     Blue return

The cable detect function on pin 13 is implemented by connecting pin 13 to
ground in the display cable. The computer gathers the display's capabilitie=
s by
reading its EDID (Extended Display Identification Data) via DDC.

The video display connector is compliant with the VESA specification.
Video Display Adapter

The iMac computer 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 video connector when the composite
adapter is attached are shown in Table 3-9.
Table 3-9  Video signals for a TV display

Pin     Signal name
1       Ground
2       n.c.
3       n.c.
4       Ground
5       S-video C
6       Ground
7       S-video Y
8       +5 volts
9       Composite video
10      DDC data
11      DDC clock
12      Ground
13      Ground (for /Cable Detect)
14      Ground

Composite video and S-video signals can be displayed on either an NTSC disp=
lay
or a PAL display. When a display is connected by way of the composite adapt=
er,
the computer detects this configuration and enables the composite and S-vid=
eo
outputs. The settings for the resolutions and standards (NTSC or PAL) are t=
hen
selectable in System Preferences.


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