From Sega Retro
The Wondermega (ワンダーメガ) is a combined Sega Mega Drive and Mega CD which was made by JVC/Victor and was initially released in 1992. It features a DSP for audio enhancement, a MIDI output jack, two microphone inputs and S-video output. In 1993, a redesigned model known as the Wondermega M2 was released, which dropped several features (including the MIDI output, DSP and motorized disc door) but added wireless controllers. Victor released the system in the US as the X'Eye, but not in the same way as they did in Japan.
Like the Mega CD, the Wondermega and X'Eye are compatible with CD+G (CD and Graphics) discs. The original Wondermega also supported the "Wonder CD" peripheral, which included a full complement of MIDI jacks (in, out and thru) as well as a music keyboard called the "Piano Player".
There were several models of the Wondermega, though sales never reached that of the standard Mega Drive or Mega CD units, due to the Wondermega's substantial price.
Wondermega, Victor RG-M1 Model
The first Wondermega model came from Victor. This model, the RG-M1, is identical to the above, but has Victor branding. It also shipped with a custom Victor Wondermega controller.
Wondermega, Sega Model
The next Wondermega model came from Sega themselves, and was only released in Japan. The control pad included is identical to that found in a regular Japanese Mega Drive package. One of the more novel features of the original Wondermega is a motorized disc door, which automatically opens or closes at the touch of a button.
Wondermega M2, Victor RG-M2 Model
Sweeping changes were made in the RG-M2 model, released by Victor in 1993. The DE-9 controller ports have been moved to the back, and in their place, an infrared receiver. M2 wireless controllers are very different in design from Sega's models and feature six buttons. The M2 employs numerous cost-cutting measures, resulting in a slightly smaller unit with a sleeker design.
During the spring of 1994, JVC released the Wondermega M2 as the X'Eye in the United States, albeit with several features from the M2 removed. The S-video connector was removed in favor of the 9-pin AV port used by the Mega Drive II (although some X'Eyes lack this) and the wireless controllers were dropped, with standard 9-pin controller ports in place of the M2's infrared receiver.