ASCII je zkratkou pro American Standard Code for Information Interchange. Jedná se o znakovou sadu, která se skládá z anglické abecedy, čísel a několik speciálních znaků. Celkem je v ní definováno 128 znaků. 33 jsou netisknutelné a ovlivňují pouze formátování textu (zalomení řádku, tabulátor), zbylých 95 jsou písmena a mezera, která je také považována za viditelný znak.
ASCII vznikla v roce 1963 a od roku 1968 musela být používána na všech počítačích v USA.
| Dec |
Hex |
Okt |
ASCII
|
| 0 |
0x00 |
000 |
NUL
|
| 1 |
0x01 |
001 |
SOH
|
| 2 |
0x02 |
002 |
STX
|
| 3 |
0x03 |
003 |
ETX
|
| 4 |
0x04 |
004 |
EOT
|
| 5 |
0x05 |
005 |
ENQ
|
| 6 |
0x06 |
006 |
ACK
|
| 7 |
0x07 |
007 |
BEL
|
| 8 |
0x08 |
010 |
BS
|
| 9 |
0x09 |
011 |
HT
|
| 10 |
0x0A |
012 |
LF
|
| 11 |
0x0B |
013 |
VT
|
| 12 |
0x0C |
014 |
FF
|
| 13 |
0x0D |
015 |
CR
|
| 14 |
0x0E |
016 |
SO
|
| 15 |
0x0F |
017 |
SI
|
| 16 |
0x10 |
020 |
DLE
|
| 17 |
0x11 |
021 |
DC1
|
| 18 |
0x12 |
022 |
DC2
|
| 19 |
0x13 |
023 |
DC3
|
| 20 |
0x14 |
024 |
DC4
|
| 21 |
0x15 |
025 |
NAK
|
| 22 |
0x16 |
026 |
SYN
|
| 23 |
0x17 |
027 |
ETB
|
| 24 |
0x18 |
030 |
CAN
|
| 25 |
0x19 |
031 |
EM
|
| 26 |
0x1A |
032 |
SUB
|
| 27 |
0x1B |
033 |
ESC
|
| 28 |
0x1C |
034 |
FS
|
| 29 |
0x1D |
035 |
GS
|
| 30 |
0x1E |
036 |
RS
|
| 31 |
0x1F |
037 |
US
|
|
| Dec |
Hex |
Okt |
ASCII
|
| 32 |
0x20 |
040 |
SP
|
| 33 |
0x21 |
041 |
!
|
| 34 |
0x22 |
042 |
"
|
| 35 |
0x23 |
043 |
#
|
| 36 |
0x24 |
044 |
$
|
| 37 |
0x25 |
045 |
%
|
| 38 |
0x26 |
046 |
&
|
| 39 |
0x27 |
047 |
'
|
| 40 |
0x28 |
050 |
(
|
| 41 |
0x29 |
051 |
)
|
| 42 |
0x2A |
052 |
*
|
| 43 |
0x2B |
053 |
+
|
| 44 |
0x2C |
054 |
,
|
| 45 |
0x2D |
055 |
-
|
| 46 |
0x2E |
056 |
.
|
| 47 |
0x2F |
057 |
/
|
| 48 |
0x30 |
060 |
0
|
| 49 |
0x31 |
061 |
1
|
| 50 |
0x32 |
062 |
2
|
| 51 |
0x33 |
063 |
3
|
| 52 |
0x34 |
064 |
4
|
| 53 |
0x35 |
065 |
5
|
| 54 |
0x36 |
066 |
6
|
| 55 |
0x37 |
067 |
7
|
| 56 |
0x38 |
070 |
8
|
| 57 |
0x39 |
071 |
9
|
| 58 |
0x3A |
072 |
:
|
| 59 |
0x3B |
073 |
;
|
| 60 |
0x3C |
074 |
<
|
| 61 |
0x3D |
075 |
=
|
| 62 |
0x3E |
076 |
>
|
| 63 |
0x3F |
077 |
?
|
|
| Dez |
Hex |
Okt |
ASCII
|
| 64 |
0x40 |
100 |
@
|
| 65 |
0x41 |
101 |
A
|
| 66 |
0x42 |
102 |
B
|
| 67 |
0x43 |
103 |
C
|
| 68 |
0x44 |
104 |
D
|
| 69 |
0x45 |
105 |
E
|
| 70 |
0x46 |
106 |
F
|
| 71 |
0x47 |
107 |
G
|
| 72 |
0x48 |
110 |
H
|
| 73 |
0x49 |
111 |
I
|
| 74 |
0x4A |
112 |
J
|
| 75 |
0x4B |
113 |
K
|
| 76 |
0x4C |
114 |
L
|
| 77 |
0x4D |
115 |
M
|
| 78 |
0x4E |
116 |
N
|
| 79 |
0x4F |
117 |
O
|
| 80 |
0x50 |
120 |
P
|
| 81 |
0x51 |
121 |
Q
|
| 82 |
0x52 |
122 |
R
|
| 83 |
0x53 |
123 |
S
|
| 84 |
0x54 |
124 |
T
|
| 85 |
0x55 |
125 |
U
|
| 86 |
0x56 |
126 |
V
|
| 87 |
0x57 |
127 |
W
|
| 88 |
0x58 |
130 |
X
|
| 89 |
0x59 |
131 |
Y
|
| 90 |
0x5A |
132 |
Z
|
| 91 |
0x5B |
133 |
[
|
| 92 |
0x5C |
134 |
\
|
| 93 |
0x5D |
135 |
]
|
| 94 |
0x5E |
136 |
^
|
| 95 |
0x5F |
137 |
_
|
|
| Dec |
Hex |
Okt |
ASCII
|
| 96 |
0x60 |
140 |
`
|
| 97 |
0x61 |
141 |
a
|
| 98 |
0x62 |
142 |
b
|
| 99 |
0x63 |
143 |
c
|
| 100 |
0x64 |
144 |
d
|
| 101 |
0x65 |
145 |
e
|
| 102 |
0x66 |
146 |
f
|
| 103 |
0x67 |
147 |
g
|
| 104 |
0x68 |
150 |
h
|
| 105 |
0x69 |
151 |
i
|
| 106 |
0x6A |
152 |
j
|
| 107 |
0x6B |
153 |
k
|
| 108 |
0x6C |
154 |
l
|
| 109 |
0x6D |
155 |
m
|
| 110 |
0x6E |
156 |
n
|
| 111 |
0x6F |
157 |
o
|
| 112 |
0x70 |
160 |
p
|
| 113 |
0x71 |
161 |
q
|
| 114 |
0x72 |
162 |
r
|
| 115 |
0x73 |
163 |
s
|
| 116 |
0x74 |
164 |
t
|
| 117 |
0x75 |
165 |
u
|
| 118 |
0x76 |
166 |
v
|
| 119 |
0x77 |
167 |
w
|
| 120 |
0x78 |
170 |
x
|
| 121 |
0x79 |
171 |
y
|
| 122 |
0x7A |
172 |
z
|
| 123 |
0x7B |
173 |
{
|
| 124 |
0x7C |
174 |
|
|
| 125 |
0x7D |
175 |
}
|
| 126 |
0x7E |
176 |
~
|
| 127 |
0x7F |
177 |
DEL
|
|