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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 : structure pointers
0x00 dword : fat pointer
0x0600 - 0x1fff : not assigned
0x2000 - 0x3fff : memory map
for each word : 1 page
0x0000 = free
0x0001 = unavailable
0x0002 = kernel
other = process number
0x4000 - 0x6fff : not assigned
0x7000 - 0x7bff : bootloader scratch
0x7000 : memory map bios buffer
0x7c00 - 0x7fff : bootloader