下载汇编器：https://www.nasm.us/pub/nasm/releasebuilds/2.16.02rc6/win64/

mov ax, 0x3f
add bx,ax
add cx,ax    

编译：
C:\Users\HP>cd D:\BaiduNetdiskDownload\01b站\lizhong\myasm

C:\Users\HP>D:

D:\BaiduNetdiskDownload\01b站\lizhong\myasm>
D:\BaiduNetdiskDownload\01b站\lizhong\myasm>
D:\BaiduNetdiskDownload\01b站\lizhong\myasm>
D:\BaiduNetdiskDownload\01b站\lizhong\myasm>nasm -f bin exam.asm -o exam。bin

D:\BaiduNetdiskDownload\01b站\lizhong\myasm>nasm -f bin exam.asm -o exam.bin

生成exam.list

     1 00000000 B83F00                  mov ax, 0x3f
     2 00000003 01C3                    add bx,ax
     3 00000005 01C1                    add cx,ax