On the following link http://books.google.co.in/books?id=Boo57V0IOq0C&pg=PA20&lpg=PA20&dq=Real+mode+initialization+code+uses+the+BIOS+int+0x15+service+with+function+number+0xe820(hence+the+stringBIOS-e820+in+the+preceding+message)+to+obtain+the+system+memory+map.&source=bl&ots=pwHDiPT3V0&sig=rHrY6I3UYdT0glPbnj13lmRFqu0&hl=en&ei=1AfhTMyfEoSqvQPJxMToDg&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCMQ6AEwAg#v=onepage&q&f=false following text is mentioned Real mode initialization code uses the BIOS int 0x15 service with function number 0xe820(hence the string BIOS-e820 in the preceding message) to obtain the system memory map. What is int 0x15 service and function number 0xe820 where can I read more about it? -- http://vger.kernel.org/vger-lists.html -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ