The following information is stored in the CMOS RAM:
1. Clock information
2. Diagnostics status byte
3. Shutdown status byte
3. Diskette drive type byte - drives A and B
4. Fixed disk drive byte - drives C and D
5. Equipment byte (# of diskette drives, display adapter and math coprocessor)
6. Low and high base memory bytes
7. Low and high expansion memory bytes
8. A checksum byte to confirm the validity of the stored data
In addition, there are several bytes of memory whose use IBM does not specify, but instead marks them as reserved.
Download: CMOSRAM2.zip (75 KB)

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CMOSRAM2

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