Codes common to all keyboards

   40      Space
   41      Backspace
   42      Tab
   43      Numeric Pad "ENTER"
   44      Return
   45      Escape
   46      Delete
   4A      Numeric pad minus
   4C      Cursor up
   4D      Cursor down
   4E      Cursor right
   4F      Cursor left
   50-59   Function keys F1-F10
   5A      Numeric pad left parenthesis
   5B      Numeric pad right parenthesis
   5C      Numeric pad slash "/"
   5D      Numeric pad asterisk
   5E      Numeric pad plus
   5F      Help