schematics:console_related_schematics [NFG Games + GameSX] arcade services circuit manual schematic Operation Maintenance Manual Arcade services circuit manual schematic

 https://gamesx.com/wiki/doku.php?id=schematics:console_related_schematics

 https://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/

https://ballyalley.com/documentation/misc_hardware_docs/Bally/Bally.html

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 http://www.andysarcade.de/gen_unicab.html

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 https://www.scribd.com/document/352014208/Service-Manual-Game-Gear-VA1-pdf#

 https://www.atariasteroids.net/archives/tag/repair-manual

http://blog.beforemario.com/2011/12/nintendo-color-tv-game-15-service.html 

https://en.wikipedia.org/wiki/List_of_Sega_arcade_system_boards

https://gbdev.gg8.se/wiki/articles/DMG_Schematics

https://www.hobbyprojects.com/quick_circuits_reference/games_and_fun_stuff_schematics.html?no_redirect=true