In VAX/VMS, four contiguous words(64 bits) starting on any addressable byte boundary. Bits are numbered from right to left,0 to63. A quadword is identified by the address of the word containing the low-order bit(bit0).

• 在vax/vms操作系统中，起始于任何可访问字节边界的四相邻字（64位）。从右至左数为0到63位。四倍字长地址由含最低位（0位）字的地址来标识。