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question about bios process

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#1 luck05


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Posted 28 July 2016 - 04:45 AM

         when you turn on a computer the bios does:
1- check the cmos for custom settings
2- the bios loads into the MEMORY the device driver and intreput handlers
3- intializes cpu registers.
4- performe the post(ram, monitor , keyboard,...)

the question is about step number 2: the bios loads into memory the device driver and interput handlers.

what's the memory talking about ?

because as i understand ,.it can not use the ram before post checking process , so what's the memory they talking about ?

Edited by luck05, 28 July 2016 - 04:48 AM.

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#2 Stancestans


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Posted 28 July 2016 - 05:19 AM

You're wrong to assume that RAM is not in use before POST. Infact, certain memory addresses are read during POST, and the system can't get to POST without memory. Have a good read here http://www.bioscentral.com/misc/biosbasics.htm.

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