beep1.asm

用汇编语言写的打铃的程序

code segment
assume cs:code
start:   mov ah,01h
        int 21h
        cmp al,1bh
        jz ppp
        cmp al,30h
        jbe ttt
        cmp al,39h
        ja ttt
        sub al,30h
        xor ah,ah
        mov bp,ax
ggg:    mov ah,02h
        mov dl,07h
        int 21h
        mov cx,8000
again1:mov dx,60000
again: dec dx
        jnz again
        dec cx 
        jnz again1
        dec bp
        jnz ggg
ttt:    jmp start
ppp:    mov ah,4ch
        int 21h
code    ends
        end start