Well, I tested a few things. Here's an overview.

Apple II+ - powered on at first, some keys slightly unresponsive. Turning it off then back on results in a white screen with random artifacts.

NES: Powers on to a blinking red light.

SNES: Works beautifully =)

Sega and SegaCD system: Works, but the DC jack on the genesis is loose.

Colecovision Adam uses a funky power adpater (looks like a PC game port or so, 8 or 10 pins in two rows.) Is the ADAM an add-on chassis for the base ColecoVision unit?

Kyle-