Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 47
CMOS RAM Configuration, Bit 7, Bits 6-0, Bits 1
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Bit 7 Bits 6-0 This read-only bit monitors the internal battery. If set to 1, this bit indicates that the real-time clock has power. If set to 0, it indicates that the real-time clock has lost power and the data in CMOS is no longer valid. These bits are reserved. CMOS RAM Configuration Figure 2-20 shows the bit definitions for the CMOS RAM configuration bytes. Diagnostic Status Byte (Hex 00E) Bit Function 7 Real-time clock power 6 Configuration record and checksum status 5 Incorrect configuration 4 Memory size mismatch 3 Hard disk controller/drive C initialization status 2 Time status indicator 1, 0 Reserved Figure 2-20. Diagnostic Status Byte (Hex 00E) Bit 7 If set to 1, this bit indicates that the real-time clock has lost power. Bit 6 If set to 1, this bit indicates that the checksum is incorrect. Bit 5 This bit indicates the results of a power-on check of the equipment byte (hex 014). If set to 1, this bit indicates that the configuration information is incorrect. Bit 4 If set to 1, this bit indicates that the memory size does not match the configuration information. Bit 3 If set to 1, this bit indicates that the controller or hard disk drive failed initialization. Bit 2 If set to 1, this bit indicates that the time is invalid. Bits 1, 0 These bits are reserved. Shutdown Status Byte (Hex 00F): This byte is defined by the power-on diagnostic programs. System Board 2-25