GenMDM Version 2 PCB 5V Jumper Function

The GenMDM Version 2 PCB contains two main changes to the hardware compared with the Version 1 PCB. These changes are:

• A 5 pin DIN MIDI input connection with associated optocoupler and components
• A 5 volt jumper

The function of the jumper is as follows.

When the jumper is connected, as shows in the photo above, then the SEGA console will power the GenMDM hardware including the 5 pin DIN MIDI input connection.

Use this jumper in the connected position when using the GenMDM with a traditional 5 pin DIN connection. Do not use this jumper in the connected position when using the GenMDM with a USB cable at all. Never connect a USB cable to the GenMDM unit when the jumper is in the connected position. Doing so may damage the GenMDM.
 

When the jumper is disconnected, as shows in the photo above, then USB cable will power the GenMDM hardware. The 5 pin DIN MIDI input connection will not be powered, and a traditional 5 pin DIN connection will not work.

Use this jumper in the connected position when using the GenMDM with a USB cable for MIDI data or for firmware updates. This will provide 5V to the GenMDM hardware via the USB cable.