Most of the time when you see something listed as not Mac compatible, they are referring to the included software. Whether it be some quirky "install wizard" or drivers files, the software will only run on Windows. Very rarely is there a piece of hardware that will not function on a Mac.
If you look at the Hardware Requirements on that link you posted, you will find that the Mac is indeed compatible with it...
Hardware compatibility
The IBM ThinkVision C220p 22.0-inch (20.0-inch viewable ) CRT monitor has been tested with IBM PCs and is compatible with systems and graphics adapters which comply with the relevant parts of "VESA and industry standards and guidelines for computer display monitor timing" V1.0 R0.8, adopted September 17, 1998.
The monitor is supplied with a detached video signal cable. This cable has a 15-pin, D-shell video connector and DVI-A connector, allowing connection to system units with either connection type.
Not all supported display modes run at the high refresh rates necessary for flicker-free performance. Display modes at lower refresh rates are available for compatibility with older video adapters and system units and will not be ISO-compliant.
Hardware requirements
The IBM ThinkVision C220p color CRT monitor operates with system units or graphic adapters that generate a video output signal that falls within the specifications:
Parameter Value
Maximum Resolution 2048 x 1536 pels
Maximum Pixel Rate 360Mhz
Horizontal Frequency Range 30 to 130kHz
Vertical Frequency Range 50 to 160Hz
The main reason manufacturers list things as not Mac compatible, is because their techs have no idea how to troubleshoot Macs.
I have a Linksys router, an HP printer, a MS mouse, a Windows keyboard, and an HP scanner. All of these items were listed as "Windows only" or not Macintosh compatible or supported. Each one works just fine on any of my Macs.
Actually, this just reminded me of something that happened at work once. Some guys were trying to get a MS Sidewinder game pad to work on this one guys laptop. The Dell laptop would not recognize the "Plug & Play" gamepad designed for Windows. They tried the thing in no less than 4 other Windows PCs and not a single one recognized it, even after installing and uninstalling and reinstalling driver software for the supposed "Plug & Play" device. They came to the conclusion that the gamepad MUST be defective. I took it, plugged it into my iBook and pulled up the System Profiler. Lo and behold, a MS Sidewinder game controller was listed under the attached USB devices. I fired up THPS4 and played away as they stood there stunned and amazed... :black: