The 99 characters required by the Standard

• the 26 uppercase letters of the English alphabet

    A  B  C  D  E  F  G  H  I  J  K  L  M
    N  O  P  Q  R  S  T  U  V  W  X  Y  Z

• the 26 lowercase letters of the English alphabet

    a  b  c  d  e  f  g  h  i  j  k  l  m
    n  o  p  q  r  s  t  u  v  w  x  y  z

• the 10 decimal digits

    0  1  2  3  4  5  6  7  8  9

• the 29 graphic characters

    !  "  #  %  &  '  (  )  *  +  ,  -  .  /  :
    ;  <  =  >  ?  [  \  ]  ^  {  |  }  ~ _

• the space character, and control characters representing horizontal tab, vertical tab, and form feed.

• 4 control characters representing alert, backspace, carriage return, and new line.