In those days, working with computers meant writing code to save a byte here and an instruction cycle there.
在那些日子里，使用电脑意味着编写代码保存一个字节在这里，一个指令周期后又再取出来放到那里。
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Remember, the LQD instruction only loads from 16-byte boundaries. It will therefore ignore the four least significant bits during the load, and just load an aligned quadword from memory.
You don't really need a command module for this, but the memory is very limited. There is a small 100-byte buffer that holds the bytecode instruction stream.