非易失性BIOS存储器是指个人电脑主板上用于存储BIOS设置的小型存储器。传统上它又被称为CMOS RAM[1]。CMOS RAM已被集成到南桥芯片组中,因而它已不是主板上的独立芯片[2][3],同时南桥也被集成到平台路径控制器中。CMOS RAM的电池一般为CR2032锂钮扣电池

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