Thursday, August 28, 2014

Use Debug Command to Dump BDA

We can use debug command in Windows prompt to dump BDA (BIOS Data Area.) The BDA is created at memory location 0040:000h with a 256 bytes or over.



The word in 40:0e is the segment address of EBDA. The address is 9ac0:0000. We can use debug to dump it.


The word in 40:13 is the system available memory size in Kbytes below 640k. The value is 0280h = 640. Therefore the memory size is 640k.

We can refer the following link for the detail of  BDA.
http://www.bioscentral.com/misc/bda.htm


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