Twin Advanced ROM System
From Sega Retro
The real name of this accessory may be Twin Advanced Rom System (T.A.R.S)[1][2][3], and it was apparently developed by Sega and SNK together. Though, Tadashi Takezaki made me think the name is Sega Twin Advanced Rom System (S.T.A.R.S.)[4]; he also says he created it and explains something but I can't read Japanese stuff. --AllisonKidd (talk) 23:23, 2 November 2016 (CDT)