Magicard
From Wiki - GameHacking.org
The Magicard is a cheat device for the Sega Mega Drive, released by Taiwanese company Gamtec sometime in the 1990's.
Code Screen
The screen has a selection of 16 letters which probably represent 0-F in hex. The code format has not been decrypted yet.
The Selection of Letters
ABDFGHIK
NPRSTUYZ