We did some testing (on video for posterity) of a bunch of games at the NAVA meeting, I need to cut the videos together to fit on one or two YouTube spots, but here's the rundown of what we found :
Gauntlet for NES (the black unlicensed Tengen version) works fine. MYTH BUSTED!
Rolling Thunder for NES (also black, unlicensed Tengen version) does not boot on the Duo.
A TON of other strange unlicensed stuff and random NES cartridges worked GREAT, including but not limited to : Quattro Adventure, Chiller, Sunday Funday, Bible Adventures, Star Tropics 1 & 2, Pacmania, Klax, The Adventures of Bayou Billy, Batman
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