assume cs:code
code segment
;把int7ch中断放在最前面，可以使程序编译时各标号与安装到内存所指向的标号保持一致
os:
jmp short ok
o1:dw o00,o01,o02,o03
ok:
push ax
push bx
push es
mov bx,cs
mov ds,bx
cmp ah,3    ;比较中断功能号大小
ja ooo  ;大于3则跳到结束
mov bh,0
mov bl,ah
add bx,bx
call word ptr o1[bx]    ;用标号o1中存储的子程序的偏移值来调用子程序
ooo: ...

assume cs:code
code segment
begin:
        mov ax,cs
        mov ds,ax        ;源
        mov ax,0
        mov es,ax        ;目的
        mov si,offset int9        ;获取int9中断例程偏移地址
        mov di,204h
        mov cx,offset int9end-offset int9        ;获取int9中断例程字节大小
        cld        ;方向为正
        rep movsb        ;传送
        push es:[9*4]
        pop es:[200h]
        push es:[9*4+2]
        pop es:[202h]        ;把原int9中断地址放...

assume cs:code

data segment
db "y!y!/!m!m!/!d!d! !h!h!:!m!m!:!s!s!"        ;格式化日期时间，（!号为颜色00100001b，绿底蓝字）
data ends

code segment
begin:
mov ax,data
mov ds,ax
mov si,0
mov al,9                                ;设置CMOS RAM的单元
call s                                
mov byte ptr ds:[0],ah
mov byte ptr ds:[2],al                ;暂存在数据区
mov al,8
call s
mov byte ptr...

assume cs:code,ss:stack

data segment
        db "1975","1976","1977","1978","1979","1980","1981","1982","1983"
        db "1984","1985","1986","1987","1988","1989","1990","1991","1992"
        db "1993","1994","1995"
;年份
        dd 16,22,382,1356,2390,8000,16000,24486,50065,97479,140417,1975...

assume cs:code,ds:data,es:table,ss:stack

data segment
    db "1975","1976","1977","1978","1979","1980","1981","1982","1983"
    db "1984","1985","1986","1987","1988","1989","1990","1991","1992"
    db "1993","1994","1995"

    dd 16,22,382,1356,2369,8000,16000,24486,50065,97479,140417,197514...