https://blog.faceutil.com/2020/07/10/sega-cd-space-ace-%ec%8a%a4%ed%8e%98%ec%9d%b4%ec%8a%a4-%ec%97%90%ec%9d%b4%ec%8a%a4-%eb%b6%81%eb%af%b8%ed%8c%90-%e3%83%ab/