Layout
  Unknown 40_1140 Xor 5000_256
Mix
  Input
    Order  1/0
  Block Pair
    Block  0x200000
    Page   0x2000
  Join by Page
    Parts  2
    Page   0x4000
Assembler
  Sector Number Slow
    Sector Size     0x2000
Comments
  Serg for forum 12887
  
  Tested on dump with many bit errors:
  assembler = raw, good 332, 4963 broken
  assembler = SN,  good 421, 2741 broken