微机原理作业( 四 )


见Word版本
.model small.stack.data.codeLED equ 0800hKEY equ 0800hstart: mov ax, @datamov ds, axagain: mov dx, KEYin al, dx; al == 01h?cmp al, 01h; 等于就跳转 je stat_off; 否则就执行到这stat_on: ; 全亮mov al, 0ffh; jmp无条件跳转jmp outputstat_off: ; 全灭mov al, 00hjmp outputoutput: mov dx, LEDout dx, aljmp again ; movax, 4c00h; int 21hend start