0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
      0  NUL SOH STX ETX EOT ENQ ACK BEL BS  HT  LF  VT  FF  CR  SO  SI
      1  DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM  SUB ESC FS  GS  RS  US
      2   SP  !   "   #   $   %   &   '   (   )   *   +   ,   -   .   /
      3   0   1   2   3   4   5   6   7   8   9   :   ;   <   =   >   ?
      4   @   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O
      5   P   Q   R   S   T   U   V   W   X   Y   Z   [   \   ]   ^   _
      6   `   a   b   c   d   e   f   g   h   i   j   k   l   m   n   o
      7   p   q   r   s   t   u   v   w   x   y   z   {   |   }   ~ DEL
      

      NUL (null)                   
      SOH (start of heading)       
      STX (start of text)          
      ETX (end of text)            
      EOT (end of transmission) - Not the same as ETB    
      ENQ (enquiry)                
      ACK (acknowledge)            
      BEL (bell) - Caused teletype machines to ring a bell.  Causes a beep
                   in many common terminals and terminal emulation programs.
      BS  (backspace) - Moves the cursor (or print head) move backwards (left)
                        one space.
      TAB (horizontal tab) - Moves the cursor (or print head) right to the next
                             tab stop.  The spacing of tab stops is dependent
                             on the output device, but is often either 8 or 10.
      LF  (NL line feed, new line) - Moves the cursor (or print head) to a new
                                     line.  On Unix systems, moves to a new line
                                     AND all the way to the left.
      VT  (vertical tab)           
      FF  (form feed) - Advances paper to the top of the next page (if the
                        output device is a printer).
      CR  (carriage return) - Moves the cursor all the way to the left, but does
                              not advance to the next line.
      SO  (shift out) - Switches output device to alternate character set.            
      SI  (shift in)  - Switches output device back to default character set.
      DLE (data link escape)       
      DC1 (device control 1)       
      DC2 (device control 2)       
      DC3 (device control 3)       
      DC4 (device control 4)       
      NAK (negative acknowledge)   
      SYN (synchronous idle)       
      ETB (end of transmission block) - Not the same as EOT  
      CAN (cancel)                 
      EM  (end of medium)  
      SUB (substitute)             
      ESC (escape) 
      FS  (file separator)
      GS  (group separator)
      RS  (record separator)
      US  (unit separator)         
      

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