ASCII Table

Dec  Char                        Dec  Char  Dec  Char  Dec  Char
--------------------------------+----------+----------+---------
  0  NUL (null)                  32  SPACE  64  @      96  `
  1  SOH (start of heading)      33  !      65  A      97  a
  2  STX (start of text)         34  "      66  B      98  b
  3  ETX (end of text)           35  #      67  C      99  c
  4  EOT (end of transmission)   36  $      68  D     100  d
  5  ENQ (enquiry)               37  %      69  E     101  e
  6  ACK (acknowledge)           38  &      70  F     102  f
  7  BEL (bell)                  39  '      71  G     103  g
  8  BS  (backspace)             40  (      72  H     104  h 
  9  TAB (horizontal tab)        41  )      73  I     105  i
 10  LF (NL line feed, new line) 42  *      74  J     106  j
 11  VT (vertical tab)           43  +      75  K     107  k 
 12  FF (NP form feed, new page) 44  ,      76  L     108  l
 13  CR (carriage return)        45  -      77  M     109  m
 14  SO (shift out)              46  .      78  N     110  n
 15  SI (shift in)               47  /      79  O     111  o
 16  DLE(data link escape)       48  0      80  P     112  p
 17  DC1(device control 1)       49  1      81  Q     113  q
 18  DC2(device control 2)       50  2      82  R     114  r
 19  DC3(device control 3)       51  3      83  S     115  s
 20  DC4(device control 4)       52  4      84  T     116  t
 21  NAK(negative acknowledge)   53  5      85  U     117  u
 22  SYN(synchronous idle)       54  6      86  V     118  v
 23  ETB(end of trans. block)    55  7      87  W     119  w
 24  CAN(cancel)                 56  8      88  X     120  x
 25  EM (end of medium)          57  9      89  Y     121  y
 26  SUB(substitute)             58  :      90  Z     122  z
 27  ESC(escape)                 59  ;      91  [     123  {
 28  FS (file separator)         60  <      92  \     124  | 
 29  GS (group separator)        61  =      93  ]     125  }
 30  RS (record separator)       62  >      94  ^     126  ~
 31  US (unit separator)         63  ?      95  _     127  DEL

Extended Ascii Codes

These were added later and are not true ascii.
There are different extended sets, but this is the most common.