71.asm

本书为清华大学第二版汇编语言的课后题详解

;7_1.asm

clrb    macro  first,count
        push   ax
        push   di
        push   cx
        lea    di,first
        mov    al,20h
        mov    cx,count
        cld
        rep    stosb
        pop    cx
        pop    di
        pop    ax
        endm