The ASCII table is a conventional code used for the representation of text characters through the bytes: each byte is made to correspond to a different character of the keyboard (letters, numbers, signs).
In reality, the ASCII standard covers only the first 128 bytes (from 00000000 to 01111111), the subsequent bytes up to 256 make up the extended ASCII table which presents various national versions.
The standard ASCII table contains numeric digits, uppercase and lowercase letters (uppercase and lowercase have different ASCII codes) punctuation, arithmetic symbols and other symbols ($, &,%, @, #, etc.). Having been conceived in America, the standard ASCII table does not include accented letters (unknown to the English spelling).
The first 32 bytes of the standard table are also reserved for control signals and various functions.

 

Codifica binaria (8-bit) Codifica Esadecimale Codifica Decimale Codifica ASCII
0 0 0 NUL
1 1 1 SOH
10 2 2 STX
11 3 3 ETX
100 4 4 EOT
101 5 5 ENQ
110 6 6 ACK
111 7 7 BEL
1000 8 8 BS
1001 9 9 HT
1010 A 10 LF
1011 B 11 VT
1100 C 12 FF
1101 D 13 CR
1110 E 14 SO
1111 F 15 SI
10000 10 16 DLE
10001 11 17 DC1
10010 12 18 DC2
10011 13 19 DC3
10100 14 20 DC4
10101 15 21 NAK
10110 16 22 SYN
10111 17 23 ETB
11000 18 24 CAN
11001 19 25 EM
11010 1A 26 SUB
11011 1B 27 ESC
11100 1C 28 FS
11101 1D 29 GS
11110 1E 30 RS
11111 1F 31 US
100000 20 32 SPACE
100001 21 33 !
100010 22 34 "
100011 23 35 #
100100 24 36 $
100101 25 37 %
100110 26 38 &
100111 27 39 '
101000 28 40 (
101001 29 41 )
101010 2A 42 *
101011 2B 43 +
101100 2C 44 ,
101101 2D 45 -
101110 2E 46 .
101111 2F 47 /
110000 30 48 0
110001 31 49 1
110010 32 50 2
110011 33 51 3
110100 34 52 4
110101 35 53 5
110110 36 54 6
110111 37 55 7
111000 38 56 8
111001 39 57 9
111010 3A 58 :
111011 3B 59 ;
111100 3C 60 <
111101 3D 61 =
111110 3E 62 >
111111 3F 63 ?
1000000 40 64 @
1000001 41 65 A
1000010 42 66 B
1000011 43 67 C
1000100 44 68 D
1000101 45 69 E
1000110 46 70 F
1000111 47 71 G
1001000 48 72 H
1001001 49 73 I
1001010 4A 74 J
1001011 4B 75 K
1001100 4C 76 L
1001101 4D 77 M
1001110 4E 78 N
1001111 4F 79 O
1010000 50 80 P
1010001 51 81 Q
1010010 52 82 R
1010011 53 83 S
1010100 54 84 T
1010101 55 85 U
1010110 56 86 V
1010111 57 87 W
1011000 58 88 X
1011001 59 89 Y
1011010 5A 90 Z
1011011 5B 91 [
1011100 5C 92 \
1011101 5D 93 ]
1011110 5E 94 ^
1011111 5F 95 _
1100000 60 96 `
1100001 61 97 a
1100010 62 98 b
1100011 63 99 c
1100100 64 100 d
1100101 65 101 e
1100110 66 102 f
1100111 67 103 g
1101000 68 104 h
1101001 69 105 i
1101010 6A 106 j
1101011 6B 107 k
1101100 6C 108 l
1101101 6D 109 m
1101110 6E 110 n
1101111 6F 111 o
1110000 70 112 p
1110001 71 113 q
1110010 72 114 r
1110011 73 115 s
1110100 74 116 t
1110101 75 117 u
1110110 76 118 v
1110111 77 119 w
1111000 78 120 x
1111001 79 121 y
1111010 7A 122 z
1111011 7B 123 {
1111100 7C 124 |
1111101 7D 125 }
1111110 7E 126 ~
1111111 7F 127 DEL



Do not be frightened by the strange symbols: many are simpler than you think ... for example, the CR, which you find in correspondence of byte 13 ... is nothing more than the Carriage Return: that is, the simple going-forward.