https://blog.faceutil.com/2017/04/30/mame-%eb%af%b8%ec%85%98-%ed%81%ac%eb%9e%98%ed%94%84%ed%8a%b8mission-craft-%eb%8b%a4%ec%9a%b4-%eb%8b%a4%ec%9a%b4%eb%a1%9c%eb%93%9c-down-i/