cw8253    equ 43h   ;8253控制字端口
t08253    equ 40h        ;8253定时器0端口
num         equ 2e9ch    ;11932=n=10ms*1.1932Mhz=10*1193.2
ou8259    equ 20h   ;8259A偶地址
ji8259    equ 21h        ;8259A奇地址

data    segment
second db ?
minute db ?
hour   db ?
countsec db 00h
SPACES DB "   ","$"
data    ends

code     segment
    assume cs:code,ds:data
    
start:  
                mov ax,data
                mov ds,ax
                
                cli                                             
                call init8253            ;初始化8253
                                  
                push ds                  ;改中断服务程序地址
                mov ax,seg interupt
                mov ds,ax
                lea dx,interupt
                mov ah,25h
                mov al,08h
;              mov ax,2508h
               int 21h
               nop
               nop        
              pop ds  

        mov ah,02h
                mov dl,'2'
                int 21h
                                
;                call init8259  ;初始化8259
                sti

        mov ah,02h
                mov dl,'2'
                int 21h

l2:            mov ah,06h            ;直接控制台读写
              mov dl,0ffh           ;输入
              int 21h
              cmp al,' '                
                jnz l2             ;space key to quit loop
                                                
                mov ah,4ch
                int 21h
                
init8253 proc             ;///////initialize8253
                mov bx,num            
                mov    al,36h         ;00110110 选择计数器0;先读低8位,后读高8位;方式3;二进制输入
                out cw8253,al                        ;将控制字36h输入控制字寄存器
                mov    al,bl                    ;计数值低字节9c
                                         ;计数器0端口
                out t08253,al            ;写入低字节
                mov    al,bh                    ;写高字节
                out t08253,al            ;///////
                ret
init8253 endp

init8259 proc                          ;initialize8259A
                mov al,00010011b    ;上升沿触发;不使用ICW3;使用ICW4
                out ou8259,al                    ;写入ICW1        
                mov al,00001000b  ;IRQ0向量号 08h
                out ji8259,al       ;写入ICW2
                mov al,00000001b  ;普通全嵌套;非缓冲;正常结束;8086
                out ji8259,al                ;写入ICW4
                mov al,11111110b  ;只开放IRQ0
                out ji8259,al                ;写入OCW1
                ret
init8259 endp

interupt proc                                
                mov ah,02h        ;输出1 调试。。
                mov dl,'1'
                int 21h  
                
           mov al,20h     ;发eoi
                out 20h,al   
                                                   
            iret        
interupt endp
                                            
code    ends
end start
        
哪位能帮忙调试下啊，好像在改中断向量的地方出问题了。。。
谢谢