s db "Watch and test the keyboard on experiment platform. Press any key to end...",0dh,0ah,"$" ;程序功能提示 Data ends Code segment assume cs:code,ds:data Start:mov ax,data mov ds,ax mov dx,offset s ;显示提示 mov ah,9 int 21h mov dx, PortA+3 mov al,82H ; PA输出 PB输入...