Lenovo ThinkPad 560E TP 560Z Technical Reference Manual - Page 36
RT/CMOS Address and NMI Mask Register (X'0070'), RT/CMOS Data Register (X'0071'),
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RT/CMOS Address and NMI Mask Register (X'0070') The NMI mask register is used with the RT/CMOS data register (X'0071') to read from and write to the RT/CMOS RAM bytes. Attention The operation following a write to X'0070' should access X'0071'; otherwise, intermittent failures of the RT/CMOS RAM can occur. Bit Function 7 NMI mask 6-0 RT/CMOS RAM address Figure 2-13. RT/CMOS Address and NMI Mask Register (X'0070') Bit 7 Bits 6-0 When this write-only bit is set to 1, the NMI is masked (disabled). This bit is set to 1 by a power-on reset. These bits are used to select RT/CMOS RAM addresses. RT/CMOS Data Register (X'0071') The RT/CMOS data register is used with the RT/CMOS address and NMI mask register (X'0070') to read from and write to the RT/CMOS RAM bytes. Bit Function 7-0 RT/CMOS data Figure 2-14. RT/CMOS Data Register (X'0071') 2-18 ThinkPad 560Z System Board