The number of monitors that can be attached to a single Macintosh is limited only by the number of video ports or video cards that can be added to the system. There are no limits built into the operating system, control panels, PCI bus, etc.
The exceptions are:
- AppleVision 1710
- AppleVision 1710AV
- ColorSync 17-inch
- ColorSync 20-inch
- AppleVision 750 AV
- AppleVision 850 AV
Note: The ColorSync 17-inch and 20-inch Displays were formerly named the AppleVision 750 and 850 Displays, respectively.
These are the display types the manuals are referring to. With this series of displays, only configurations including one or two displays are supported. A single Macintosh with one or two of these displays attached may also add other displays.
The limit for these displays is based on the capability of the control panel software and the computer's Apple Desktop Bus connections.