/		RF0
  bin/
    chmod
    date
    login
    ls
    mkdir
    sh
    tap
  etc/
    as2
    dpd
    getty
    glob
    ident
    init
    m6
    motd
    mount
    msh
    passwd
    suftab
    tmg0.s
    tmg[abc]
    uids
    umount
  sys/		RK1
    lang/
      mdir/
        m6a
        m6b
    man/
      man?/
    sys/
      unix
      c/
        nc
  tmp/
    utmp
    wtmp
  usr/		RK0
    dpd/
    ken/
      cal
    lang/
      bdir/
        ba
        bc
        bilib.a
        brt[12]
    lem/
      s.tab
    fort/
      fc[1234]
    games/
      bj
      moo
      ttt
    lib/
      crt0.o
      fr0.o
      liba.a
      libb.a
      libc.a
      libf.a
    pub/
      ascii
      kbd
      tabs