I was organizing my controllers and found an AC plug that I at first thought might be for the Nintendo. Roughly the same size, the jack even fits where it plugs into the console. Here are the specs though:

Recoton brand,
AC/AC adaptor
Model: V479
Cat. No: AW-12A-1.25BA
Input:120V 60Hz 22VA
Output: 12VAC 1.3A

No markings to indicate polarity oddly enough, I could check it with a multimeter later but was hoping someone could shed some immediate light on this. Searched google and came up with nothing informative. Possibly a third-party TG-16 power plug??