在这种模式中，指令本身就包含了数据加载的源地址。
In this mode, the instruction itself contains the address from which to load the data.
早期时，启动一台计算机意味着要给计算机喂一条包含引导程序的纸带，或者手工使用前端面板地址/数据/控制开关来加载引导程序。
In the early days, bootstrapping a computer meant feeding a paper tape containing a boot program or manually loading a boot program using the front panel address/data/control switches.
该数据加载和读取电路生成地址信号。
Address signals are generated by the data loading and reading circuitry.
该数据加载和读取电路生成地址信号。
Address signals are generated by the data loading and reading circuitry.
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