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portland-os/doc/design/memory_map.txt

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0x0000 - 0x03ff : interrupt vector table
0x0400 - 0x04ff : bios data area
0x0500 - 0x05ff : global info
0x00 dword : fat pointer
0x04 dword : root directory pointer
0x08 word : usable memory from 0 to 1MiB in kiB
0x0a word : usable memory from 1MiB to 16MiB in kiB
0x0c dword : bootloader:
lower word: low memory usage by bootloader in kiB,
upper word: kernel image length in kiB
kernel:
file handle array pointer
0x10 dword : process array pointer
0x14 word : usable memory from 16MiB up in 64s of kiB
0x0600 - 0x6fff : not assigned
0x7c00 - 0x7fff : bootloader