dup (#)用于数组声明。例如
array1 byte 20 DUP(0) ;declare an array of 20 bytes
;each byte initialized to 0
array2 byte 20 DUP('X') ;declare an array of 20 bytes
;each byte initialized to 'X'
array3 byte 20 DUP (?) ;declare an array of 20 bytes
;each byte is not initialized
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