Changes

*'''Sega Retro:''' [https://segaretro.org/Category:Sega_System_series Sega System series], [https://segaretro.org/List_of_Sega_arcade_systems List of Sega arcade systems].

*'''Wikipedia''': [https://en.wikipedia.org/wiki/List_of_Sega_arcade_system_boards List of Sega arcade system boards]