From Sega Retro

Wait, are we sure the Master System in Korea did not get FM audio? I had this long session with a Korean user over IRC and we determined that there was FM sound at least used in promotions by Samsung - Andlabs 01:58, 21 December 2012 (CST)

I've looked over the motherboard for the Gam-Boy (the pics of which are on SMS Power somewhere) and the YM2413 isn't present. Perhaps the FM audio was planned but never actually implemented?--ApolloBoy 03:21, 14 January 2013 (CST)
Perhaps; thanks for the confirmation. - Andlabs 08:11, 14 January 2013 (CST)