qbasicmichael is correct, this is not x86/x64. Most likely this is a pseudo machine, somewhat based on Motorola 6502. It would be helpful if you posted the information sheet containing the instruction set. Given that, I can easily tutor you on this, and give you a solid background in Assembler in general as well. I have more than 35 years of experience as a software engineer, with a myriad of languages, including several assemblers, C/C++, Pascal, COBOL, FORTRAN, RPG II, etc.