BBC keyboard INKEY numbers
                                  ==========================

           +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
           | f0  | f1  | f2  | f3  | f4  | f5  | f6  | f7  | f8  | f9  |BREAK|
           | -33 |-114 |-115 |-116 | -21 |-117 |-118 | -23 |-119 |-120 |     |
  +-----+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-----+-----+-----+
  | ESC | 1 ! | 2 " | 3 # | 4 $ | 5 % | 6 & | 7 ' | 8 ( | 9 ) |  0  | - = | ^ ~ | \ | | LEFT|RIGHT|
  |-113 | -49 | -50 | -18 | -19 | -20 | -53 | -37 | -22 | -39 | -40 | -24 | -25 |-121 | -26 |-122 |
  +-----+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |  TAB   |  Q  |  W  |  E  |  R  |  T  |  Y  |  U  |  I  |  O  |  P  |  @  | [ { | _ £ |  UP |DOWN |
  |  -97   | -17 | -34 | -35 | -52 | -36 | -69 | -54 | -38 | -55 | -56 | -72 | -57 | -41 | -58 | -42 |
+-+---+----++----++----++----++----++----++----++----++----++----++----++----++----++----+-----+-+---+
| CAPS| CTRL|  A  |  S  |  D  |  F  |  G  |  H  |  J  |  K  |  L  | ; + | : * | ] } |   RETURN   |
| -65 | -2  | -66 | -82 | -51 | -68 | -84 | -85 | -70 | -71 | -87 | -88 | -73 | -89 |    -74     |
+-----+-----+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-----++-----+-----+
|SHLCK|  SHIFT |  Z  |  X  |  C  |  V  |  B  |  N  |  M  | , < | . > | / ? |  SHIFT  | DEL | COPY|
| -81 |   -1   | -98 | -67 | -83 |-100 |-101 | -86 |-102 |-103 |-104 |-105 |   -1    | -90 |-106 |
+-----+--------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+---------+-----+-----+
                     |                     SPACE                     |
                     |                      -99                      |
                     +-----------------------------------------------+