OpenMW Extensions:

Segment 0:
(not implemented yet)
opcodes 0x20-0x3f unused

Segment 1:
(not implemented yet)
opcodes 0x20-0x3f unused

Segment 2:
(not implemented yet)
opcodes 0x200-0x3ff unused

Segment 3:
(not implemented yet)
opcodes 0x200-0x3ff unused

Segment 4:
(not implemented yet)
opcodes 0x200-0x3ff unused

Segment 5:
op 2000000: push 1 if cell has changed since last frame, 0 if not
opcodes 0x2000001-0x3ffffff unused