每次将段选择器加载到段寄存器中时，对应的段描述符都会从内存加载到相匹配的不可编程CPU寄存器中。
Each time a segment selector is loaded on to segment registers, the corresponding segment descriptor is loaded from memory into a matching non-programmable CPU register.
脉冲选择器电路向通过垂直移位寄存器电路而选择出的任意的像素行供给驱动脉冲。
A pulse selector circuit supplies a drive pulse to the desired pixel row selected by the vertical shift register circuit.
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