Page Comparison

IN:
      IX = memory handle (from previous OS_Mop)
      B = bank (slot ORed)
      H = page address high byte ($00-$3F)
      L = number of pages to be allocated (1 to 64)

OUT:  Fc = 0, memory has been allocated
      Fc = 1, A = RC_Room if not enough space in slot(s)
              A = RC_Fail if bad argument

Registers changed after return:
     ..BCDE.L/IXIY same
     AF....H./.... different