//       modes: 0 display the list forward, no positional values
//              1 display the list forward, with positional values
//              2 display the list backwards, no positional values
//              3 display the list backwards, with positional values
//              4 display the list forward, no positional values, in ASCII
//              5 display the list forward, with positional values, in ASCII
//              6 display the list backwards, no positional values, in ASCII
//              7 display the list backwards, with positional values, in ASCII