有些平台(非powerpc)允许程序员为索引寄存器指定一个倍数。
Some platforms (not PowerPC) allow programmers to specify a multiplier for the index register.
当然，这些寄存器的内容已由程序员针对每个设备加以规定了。
Naturally, the contents of these registers have been specified by the programmer for each device.
之后，驾驶员命令设备来完成其工作(通过操纵其寄存器)和直接在设备传送输出数据在存储器中分配的缓冲区。
Then the driver commands the device to do its job (by manipulating its registers) and the device transfers output data directly to the allocated buffer in the memory.
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