AY-5-3600 keyboard ROM matrix mapping
             =====================================

        X0    X1    X2    X3    X4    X5    X6    X7    X8
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |
Y0 S  |  !  |  @  |  #  |  $  |  %  |  ^  |  &  |  *  |  (  |
   -  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &11 | &17 | &05 | &12 | &14 | &19 | &15 | &09 | &0F |
Y1 S  |  Q  |  W  |  E  |  R  |  T  |  Y  |  U  |  I  |  O  |
   -  |  q  |  w  |  e  |  r  |  t  |  y  |  u  |  i  |  o  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &01 | &13 | &04 | &06 | &07 | &08 | &0A | &0B | &0C |
Y2 S  |  A  |  S  |  D  |  F  |  G  |  H  |  J  |  K  |  L  |
   -  |  a  |  s  |  d  |  f  |  g  |  h  |  j  |  k  |  l  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &1A | &18 | &03 | &20 | &16 | &02 | &0E | &0D |  ,  |
Y3 S  |  Z  |  X  |  C  | &20 |  V  |  B  |  N  |  M  |  <  |
   -  |  z  |  x  |  c  | SPC |  v  |  b  |  n  |  m  |  ,  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &09 | &1E |  -  | &18 | &03 |  :  |  =  |  /  |  .  |
Y4 S  | &09 | &1E |  =  | &18 | &03 |  *  |  =  |  ?  |  >  |
   -  | &09 | &1E |  -  | &18 | &03 |  :  |  =  |  /  |  .  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  |  H  |  %  |  $  | &0D |  }  |  >  |  <  |  '  |  ;  |
Y5 S  |  H  |  %  |  $  | &0D |  }  |  >  |  <  |  "  |  :  |
   -  |  H  |  %  |  $  | &0D |  }  |  >  |  <  |  '  |  ;  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  |  +  | &0D |  L  | &1B | &1D |  ;  | &10 | &0A |  ]  |
Y6 S  |  +  |  ]  |  L  |  {  |  }  |  +  |  P  | &0A |  [  |
   -  |  +  |  m  |  L  |  [  |  ]  |  ;  |  p  | &0A |  ]  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &0E | &0F | &1F | &0B | &1F | &00 |  0  |  =  | &1F |
Y7 S  |  >  | &0F | &1F | &0B |  =  | &00 |  )  |  +  |  _  |
   -  | &0E | &0F | &1F | &0B |  _  | &00 |  0  |  =  |  -  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &00 | &0E | &06 | &07 |  )  |  *  |  &  | &0C |  0  |
Y8 S  |  @  |  ^  |  &  |  '  |  )  |  *  |  &  |  <  |  0  |
   -  |  p  |  n  |  6  |  7  |  )  |  *  |  &  | &0C |  0  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
   C  | &01 | &02 | &7F |  "  | &20 |  !  |  #  |  (  |  )  |
Y9 S  |  !  |  "  |  [  |  "  | &20 |  !  |  #  |  (  |  )  |
   -  |  1  |  2  |  k  |  "  | SPC |  !  |  #  |  8  |  9  |
      +-----+-----+-----+-----+-----+-----+-----+-----+-----+
        X0    X1    X2    X3    X4    X5    X6    X7    X8