Table 3 State transition table for DOS filename

  State  Substate  Target  True   False   Action    BadFcn
------------------------------------------------------------
    A       0        a       1     ERR    pushcar   errmsg
    B       1        x       1      2     pushcar    skip
            2       DOT      4      3     pushcar    skip
            3        e      OUT    ERR    pushcar   errmsg
    C       4        x       5     ERR   savetoken  errmsg
    D       5        x       7      6     pushcar    skip
            6        e      OUT    ERR   savetoken  errmsg
    E       7        x       9      8     pushcar    skip
            8        e      OUT    ERR   savetoken  errmsg
    F       9        e      OUT    ERR   savetoken  errmsg