Changes

The [[VMU]] for the [[Sega Dreamcast]] can be modified to accept as a power source an alternative to the pair of CR2032 batteries the VMU is designed for such as AA batteries or an AC adapter that supplies 6V of direct current. The new power source can be soldered directly to the VMU, or a common connector can be soldered to the VMU to enable you to detach the new power supply.

To do this mod right, you should attempt to track down a cord similar to the one pictured to the side. What it is is an extension cord that takes a cylindrical AC adapter's cord and splits it into two wires. What this cord will enable you to do is solder the female end to the VMU and use the male ends to modify a battery pack or AC adapter (if necessary) so they can plug into the female end. This will allow you to detach your new power supply from the VMU when you're not using it and to switch between AC power and battery power as you please.

If you decide to use an AC adapter with this cord, you should first identify its polarity (see above) and then use a voltmeter on the extension cord to figure out which wire corresponds to which part of the plug. This is so that when you solder the female end to the VMU you will not mix up positive and negative. If you're only using a battery pack, you can choose your polarity; just make sure you're consistent with both the female end (VMU side) and male end (battery side).