Mem layout for osldr

0000 - 07C0 = BIOS data and stack
07C0 - 1000 = Boot sector
1000 - 1400 = Tempory storage for fat chains
1400 - 2000 = Tempory storage for directory entries
2000 - 3000 = OSLDR
3000 - 5000 = FAT
5000 - a000 = Kernel and modules load area