Problem Regarding CMOS Memory

[I have a Problem]

I want to store my own data in unused memory(that is memory that is not used by any device in the system) of CMOS register.
Is it possible, if it is posible then how can i achive it.
Please provide help.
My Mail ID: [email protected]
Please help me
Thank you,
Jai.

[Chase]

With older systems it's best to not use memory the *may* be used by the BIOS. On newer systems there is an ACPI BIOS call that you can make to get a memory map of used memory. Take a look in Ralf Browns Int list.

-Chase

[How To]

Thanks for your response Chase. Is it posible to get some example for accessing the CMOS RAM. I want to store some data in the unused area of the CMOS RAM so that i can preserve the data permenantly.
Please help me.
-Jai.

[Chase]

Doing that is really hard. You're probably going to be stuck at disassembling a particular boards BIOS to figure out exactly what parts of CMOS are being used. The areas of CMOS that are used just don't stay consistant across different motherboards. Just take a look at how hard it is to find a BIOS password hack utility that works on more then a couple of boards.

If you hit google and search for "cmos memory map" you get a couple of examples.

-Chase