https://github.com/horsicq/XOpcodeCalc ref - https://n10info.blogspot.com/2019/07/xopcodecalc.html
C Costas Administrator Staff member Dec 25, 2019 #1 https://github.com/horsicq/XOpcodeCalc ref - https://n10info.blogspot.com/2019/07/xopcodecalc.html
