   # Create an most-recently used list head node and return it. We call this to
   # create the core and balance list in the constructor above.
   createMRU: ->
-    head            = { address: -1 }
-    head.next       = head
-    head.previous   = head
 
   # Link tier to the head of the most-recently used list.
   link: (head, entry) ->


  #
  createBranch: (address, override) ->
    page = @cache[address] = @link @mru.core,
      balancers: 0
      count: 0
      penultimate: true

  # list.
  constructor: (@directory, @options) ->
    @cache          = {}
    @mru            = { address: null }
    @mru.next       = @mru
    @mru.previous   = @mru
    @nextAddress    = 0
    @length         = 1024
    @balancer       = new Balancer
