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ASCII Codes
ASCII codes is short form for American Standard Code for Information Interchange. This standard
was made to develpe a common way of presentation in early computers. Each ASCII code uses
7-bits, making 127 different characters. This was later changed to 256 characters with the inclusion of
the extended ASCII codes, for the purpose of using complete bytes for characters. The extended
ASCII codes were used by early computers that were only capable of alphnumerical block display,
and not capable of per pixel addressing. Extended ASCII codes were made to include usefull
characters that could be used to create borders and lines. There are many different versions of
extended ASCII code, but all serve the same purpose. Extended ASCII codes do not serve the same
usefullness to todays computers as they did a while ago, so support for extended ASCII in newer
computers is selective. 7-bit ASCII is still very popular because of its small storage size, and low level
functionality.
Dec Hx Char Dec Hx Char Dec Hx Char Dec Hx Char
--------------- ----------- ----------- -----------
0 0 NUL (null) 32 20 SPACE 64 40 @ 96 60 `
1 1 SOH (start of heading) 33 21 ! 65 41 A 97 61 a
2 2 STX (start of text) 34 22 " 66 42 B 98 62 b
3 3 ETX (end of text) 35 23 # 67 43 C 99 63 c
4 4 EOT (end of transmission) 36 24 $ 68 44 D 100 64 d
5 5 ENQ (enquiry) 37 25 % 69 45 E 101 65 e
6 6 ACK (acknowledge) 38 26 & 70 46 F 102 66 f
7 7 BEL (bell) 39 27 ' 71 47 G 103 67 g
8 8 BS (backspace) 40 28 ( 72 48 H 104 68 h
9 9 TAB (horizontal tab) 41 29 ) 73 49 I 105 69 i
10 A LF (NL line feed) 42 2A * 74 4A J 106 6A j
11 B VT (vertical tab) 43 2B + 75 4B K 107 6B k
12 C FF (NP form feed) 44 2C , 76 4C L 108 6C l
13 D CR (carriage return) 45 2D - 77 4D M 109 6D m
14 E SO (shift out) 46 2E . 78 4E N 110 6E n
15 F SI (shift in) 47 2F / 79 4F O 111 6F o
16 10 DLE (data link escape) 48 30 0 80 50 P 112 70 p
17 11 DC1 (device control 1) 49 31 1 81 51 Q 113 71 q
18 12 DC2 (device control 2) 50 32 2 82 52 R 114 72 r
19 13 DC3 (device control 3) 51 33 3 83 53 S 115 73 s
20 14 DC4 (device control 4) 52 34 4 84 54 T 116 74 t
21 15 NAK (negative acknowledge)53 35 5 85 55 U 117 75 u
22 16 SYN (synchronous idle) 54 36 6 86 56 V 118 76 v
23 17 ETB (end of trans. block) 55 37 7 87 57 W 119 77 w
24 18 CAN (cancel) 56 38 8 88 58 X 120 78 x
25 19 EM (end of medium) 57 39 9 89 59 Y 121 79 y
26 1A SUB (substitute) 58 3A : 90 5A Z 122 7A z
27 1B ESC (escape) 59 3B ; 91 5B [ 123 7B {
28 1C FS (file separator) 60 3C < 92 5C \ 124 7C |
29 1D GS (group separator) 61 3D = 93 5D ] 125 7D }
30 1E RS (record separator) 62 3E > 94 5E ^ 126 7E ~
31 1F US (unit separator) 63 3F ? 95 5F _ 127 7F DEL
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Most keyboards are able to produce ASCII symbols by holding down the "ALT" key, while using the
"keypad" numbers to input the ASCII value. On release of the "ALT" key, an ASCII value is
produced.
Bits and Bytes | ASCII
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