Question: I purchased two AppleVision Monitors and am trying to set them up, but my computer only has one ADB port on the back. I tried connecting the ADB cable from the first monitor to the side of the second monitor, but that did not work. Then I tried using a third party ADB splitter cable and the second monitor came up in 640×480 only. How do I set them up correctly?
Answer: To set up two AppleVision displays with a computer that has a single ADB port, be sure to use the recommended Apple shielded connector cable (ADB splitter cable), part number M5556LL/A. This is the only officially supported method of connecting two AppleVision Displays to a single Macintosh ADB port. Setup instructions are in the User Manual for the display.
When some third-party ADB splitter cables are used, AppleVision software may be unable to recognize one or both monitors as AppleVision displays. As a result, the screen resolution of the unrecognized monitor(s) will revert to 640×480, and the AppleVision control strip and control panel will not allow you to select any other resolution besides 640×480.