Nope, just a regular GBC as far as I know.

I tried flipping the link cable and I still get the same result. I'll follow up through email, thanks for all your help.

Oh okay, for sure.

With the link cable attached only to the GBC it loads up the mGB rom with no issues.

I recently picked up an Arduinoboy pro and a GBC and I'm trying to just test the basic setup with mGB, but I'm running into an issue where the GBC will not start up with the link cable and Arduinoboy hooked up. It just hangs there and doesn't even show the Gameboy logo. The Arduinoboy is on the mGB setting. If I don't connect the link cable, the mGB rom seems to load correctly. The Arduinoboy is brand new and preassembled, and I'm using the link cable that came with it.
Any ideas what I might be missing here? Is the GBC maybe no good?