Most instructions follow a similar format, with the register that holds the result specified in the first operand.
大多数指令都遵循类似的格式，结果存储在第一个操作数内指定的寄存器中。
To support a new format (such as PDF), you only need to implement a new Batch, register the Batch with the engine, and recompile.
为了支持新的格式(如pdf)，只需要实现一个新的Batch，同时向引擎注册该Batch，然后重新编译。
Word Address Format is mostly used. In this format, each element of information is prefixed by a letter. And the controller conveys the letter to a particular register.
字地址格式最常用。在这种格式中，每个信息元素前面带有一个字母。控制器将这个字母转到特定寄存器。
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