https://blog.faceutil.com/2017/10/11/nes-%ed%85%8c%ed%81%ac%eb%aa%a8-%eb%b3%bc-tecmo-bowl-%e3%83%86%e3%82%af%e3%83%a2%e3%83%9c%e3%82%a6%e3%83%ab-%ef%bf%a1/