i need some help in getting memory map.
use16
org 0x7C00
mov ax,0
mov ss,ax
mov es,ax
mov ds,ax



mov eax,0x0000E820
mov edx,0x534D4150
mov ebx,0x00000000
mov ecx,300
mov edi,buff
int 15



jc $

carry flag is clear = success, but registers are not changed

I put this out there a while ago, this should help. I intend on updating the post since I have updating the code to work for 64 bits of memory.

http://board.flatassembler.net/topic.php?t=6217

check this article: "http://wiki.osdev.org/Memory_Map_(x86)"

Maybe its too late for an answer but I think you want to call int 15h not int 15 (=int 0fh)
or in your language above int 0x15