JZ91 - header bank

address : LQJZ system link in /JZUC/

    - 2*JQMLEV+6  current SV bank for depth JQMLEV
             ...  ...
              +7                            1
      - JQMLEV+6  current SV bank for depth 0  (root)

      - JQMLEV+5  down call bank for depth JQMLEV-1
             ...  ...
             - 7                           1
             - 6  down call bank for depth 0  (root)
             - 5  zero  (= LQUP for the root)

             - 4  fan-out bank for immediate access to SV banks
             - 3  linear chain of SV banks
             - 2  linear chain of pending JZFL derived title banks
links :      - 1  linear chain of pending JZAN title banks

data :         1  JQNACC-9, # of extra account words, normally zero
               2  NQLINK   working space parameters
               3  NDATA    at level 0 (= root)

               4  NQLINK
               5  NDATA    at level 1 (= 1 below the root)
             ...  ...

      2*JQMLEV+1  NDATA    at level JQMLEV-1
      2*JQMLEV+2  guard word

        JQMLEV is MAXLEV of JZINIT, the maximum call depth

Fan-out bank

address : LQ(LQJZ-4)

        link  -J  address of SV bank J

        data   1  N = length of the list,  J=1,...,N

             J+1  ID of SV bank J