Manpages - ascii.7

For convenience, below are more compact tables in hex and decimal.

     2 3 4 5 6 7       30 40 50 60 70 80 90 100 110 120
   -------------      ---------------------------------
  0:   0 @ P ` p     0:    (  2  <  F  P  Z  d   n   x
  1: ! 1 A Q a q     1:    )  3  =  G  Q  [  e   o   y
  2: " 2 B R b r     2:    *  4  >  H  R  \  f   p   z
  3: # 3 C S c s     3: !  +  5  ?  I  S  ]  g   q   {
  4: $ 4 D T d t     4: "  ,  6  @  J  T  ^  h   r   |
  5: % 5 E U e u     5: #  -  7  A  K  U  _  i   s   }
  6: & 6 F V f v     6: $  .  8  B  L  V  `  j   t   ~
  7: ' 7 G W g w     7: %  /  9  C  M  W  a  k   u  DEL
  8: ( 8 H X h x     8: &  0  :  D  N  X  b  l   v
  9: ) 9 I Y i y     9: '  1  ;  E  O  Y  c  m   w
  A: * : J Z j z
  B: + ; K [ k {
  C: , < L \ l |
  D: - = M ] m }
  E: . > N ^ n ~
  F: / ? O _ o DEL

An ascii manual page appeared in Version 7 of AT&T UNIX.

On older terminals, the underscore code is displayed as a left arrow, called backarrow, the caret is displayed as an up-arrow and the vertical bar has a hole in the middle.

Uppercase and lowercase characters differ by just one bit and the ASCII character 2 differs from the double quote by just one bit, too. That made it much easier to encode characters mechanically or with a non-microcontroller-based electronic keyboard and that pairing was found on old teletypes.

The ASCII standard was published by the United States of America Standards Institute (USASI) in 1968.