Electron keyboard INKEY numbers
                                ===============================

  +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
  | ESC | 1 ! | 2 " | 3 # | 4 $ | 5 % | 6 & | 7 ' | 8 ( | 9 ) | 0 @ | - = | ^ ~ | \ | |BREAK|
  |-113 | -49 | -50 | -18 | -19 | -20 | -53 | -37 | -22 | -39 | -40 | -24 | -25 |-121 |     |
  |     |     |     |     |     |     |     |-125 |     |     | -72 |     | -26 |-122 |     |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
     |CAPS |  Q  |  W  |  E  |  R  |  T  |  Y  |  U  |  I  |  O  |  P  | £ { | _ } | [ ] |
     | -65 | -17 | -34 | -35 | -52 | -36 | -69 | -54 | -38 | -55 | -56 | -58 | -41 | -57 |
     |     |     |     |     |     |     |     |     |     |     |     |     | -42 | -89 |
     |     |     |     |     |     |     |     |-123 |     |     |     |     |     |-106 |
     |     |     |     |     |     |     |-126 |-126 |-126 |-126 |-126 |-126 |-126 |-126 |
     ++----++----++----++----++----++----++----++----++----++----++----++----++----+---+-+
      | CTRL|  A  |  S  |  D  |  F  |  G  |  H  |  J  |  K  |  L  | ; + | : * | RETURN |
      | -2  | -66 | -82 | -51 | -68 | -84 | -85 | -70 | -71 | -87 | -88 | -73 |  -74   |
      |     |     |     |     |     |     |-124 |-124 |-124 |-124 |-124 |-124 | -124   |
      +-----+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+------+-+---+
      |  SHIFT |  Z  |  X  |  C  |  V  |  B  |  N  |  M  |  <  |  >  |  ?  |  SHIFT  | DEL |
      |   -1   | -98 | -67 | -83 |-100 |-101 | -86 |-102 |-103 |-104 |-105 |   -1    | -90 |
      |  -127  |     |     |     |     |     |     |     |     |     |     |  -127   |     |
      +--------+-----+--+--+-----+-----+-----+-----+-----+-----+-----+--+--+---------+-----+
                        |                     SPACE                     |
                        |                      -99                      |
                        +-----------------------------------------------+

Notes: INKEY-123 to INKEY-127 give extraneous results due to a table over-run in the MOS. The
Electron MOS passes INKEY -&x0 (eg INKEY-32, INKEY-128, etc) to sideways ROMs.