org    0x7c00            ; 告诉编译器程序加载到7c00处
    mov    ax, cs
    mov    ds, ax
    mov    es, ax
    call   DispStr           ; 调用显示字符串例程
    jmp    $                 ; 无限循环  
DispStr:
    mov     ax, 0600h
    mov     bx, 0h
    mov     cx, 0h
    mov     dh, 25-1
    mov     dl, 80-1        ; vga text-mode: 80x25
    int     10h             ; clear screen
    mov     ax, 0200h
    mov     bx, 0h
    mov     dx, 1326h       ; 19=13H, 38=26H
    int     10h             ; set cursor position
    mov     ax, NWPU
    mov     bp, ax            ; ES:BP = 串地址, es has been set to the same seg
    mov     cx, 4             ; CX = 串长度
    mov     ax, 01300h        ; AH = 13,  AL = 01h
    mov     bx, 00f9h         ; 页号为0(BH = 0) 黑底红字(BL = 0Ch,高亮)
    int     10h               ; 10h 号中断
    mov     ax, 0200h
    mov     bx, 0h
    mov     dx, 0h
    int     10H             ; reset cursor to 0,0
    ret
NWPU:                    db    "NWPU"
times      510-($-$$)    db    0    ; 填充剩下的空间，使生成的二进制代码恰好为512字节
dw         0xaa55                   ; 结束标志