ZX80 keyboard layout
                                    ====================
              +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
              |     |     |     |     |     |     |     |     |     |     |
              | NOT |  AND| THEN|  TO |LEFT |DOWN | UP  |RIGHT| HOME|RBOUT|
              |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  0  |
              +-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+
                | NEW |LOAD |SAVE | RUN |CONT | REM | IF  |INPUT|PRINT|     |
                | blk | blk | blk | blk | blk |  "  |  $  |  (  |  )  |  *  |
                |  Q  |  W  |  E  |  R  |  T  |  Y  |  U  |  I  |  O  |  P  |
                +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
                   |LIST |STOP | DIM | FOR |GOTO |POKE |RAND | LET |     |EDIT |
                   | blk | blk | blk | blk | blk |  ** |  -  |  +  |  =  |     |
                   |  a  |  s  |  d  |  f  |  g  |  h  |  j  |  k  |  l  |NEWLN|
              +----+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+-----+
              |        |     |CLEAR| CLS |GOSUB| RET |NEXT |     |     | BREAK |
              |        |  :  |  ;  |  ?  |  /  | OR  |  <  |  >  |  ,  |   £   |
              | SHIFT  |  Z  |  X  |  C  |  V  |  B  |  N  |  M  |  .  | SPACE |
              +--------+-----+-----+-----+-----+-----+-----+-----+-----+-------+