CMOS RAM Configuration
Figure 2-20 shows the bit definitions for the CMOS RAM
configuration bytes.
Diagnostic Status Byte (X
'
00E
'
)
Figure
2-20. Diagnostic Status Byte (X
'
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
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 (X
'
014
'
). If 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 (X
'
00F
'
): This byte is defined by the
power-on diagnostic programs.
ThinkPad 560Z System Board
2-23
