IBM 560 - Manual (Page 44)

CMOS RAM Configuration
Figure 2-20 shows the bit definitions for the CMOS RAM
configuration bytes.
Diagnostic Status Byte (Hex 00E)
Figure 2-20. 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
Bit 7 When set to 1, this bit indicates that the real-time clock
has lost power.
Bit 6 When 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). When set to 1, this bit
indicates that the configuration information is incorrect.
Bit 4 When set to 1, this bit indicates that the memory size
does not match the configuration information.
Bit 3 When set to 1, this bit indicates that the controller or hard
disk drive failed initialization.
Bit 2 When 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.
2-22 ThinkPad 560/560E System Board