详解汇编语言 dup伪指令

assume cs:code, ds:data
data segment
 db 10 dup (0) ; 连续定义10个字节型的0
 db 1,2,3,4,5,6 
 db 10 dup ('a') 
 db 6,5,4,3,2,1
 db 4 dup('123','abc')
data ends
code segment
 start: mov ax, data
   mov ds,ax
   mov ax, 4C00H
   int 21H
code ends
end start