Editing ASCII (section)

===<span class="anchor" id="ASCII-printable-characters"></span><span class="anchor" id="Printable_characters"></span>Printable character table===
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At the time of adoption, the codes 20<sub>hex</sub> to 7E<sub>hex</sub> would cause the printing of a visible character (a glyph), and thus were designated "printable characters". These codes represent letters, digits, [[punctuation mark]]s, and a few miscellaneous symbols. There are 95 printable characters in total.{{efn|Printed out, the characters are: {{Pre|<nowiki> !"#$%&'()*+,-./0123456789:;<=>?</nowiki>&ZeroWidthSpace;<nowiki>@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_</nowiki>&ZeroWidthSpace;<nowiki>`abcdefghijklmnopqrstuvwxyz{|}~</nowiki>}}}}

The empty space between words, as produced by the space bar of a keyboard, is character code 20<sub>hex</sub>.  Since the space character is visible in printed text it considered a "printable character", even though it is unique in having no visible glyph. It is listed in the printable character table, as per the ASCII standard, instead of in the control character table.<ref name="Mackenzie_1980"/>{{rp|223}}<ref name="RFC-20_1968" />

Code 7F<sub>hex</sub> corresponds to the non-printable "delete" (DEL) control character and is listed in the control character table.

Earlier versions of ASCII used the up arrow instead of the [[caret (computing)|caret]] (5E<sub>hex</sub>) and the left arrow instead of the underscore (5F<sub>hex</sub>).<ref name="ASCII-1963"/><ref name="Haynes_2015">{{cite web|title=First-Hand: Chad is Our Most Important Product: An Engineer's Memory of Teletype Corporation |author-first=Jim |publisher=Engineering and Technology History Wiki (ETHW) |date=2015-01-13 |author-last=Haynes |url=https://ethw.org/First-Hand:Chad_is_Our_Most_Important_Product:_An_Engineer's_Memory_of_Teletype_Corporation |access-date=2023-02-14 |quote=There was the change from 1961 ASCII to 1968 ASCII. Some computer languages used characters in 1961 ASCII such as up arrow and left arrow. These characters disappeared from 1968 ASCII. We worked with Fred Mocking, who by now was in Sales at [[Teletype Corporation|Teletype]], on a type cylinder that would compromise the changing characters so that the meanings of 1961 ASCII were not totally lost. The underscore character was made rather wedge-shaped so it could also serve as a left arrow.}}</ref>

<!-- To be more useful this list should be expanded to include the character names and reflect the various revisions of the ASCII standard -->
{| class="wikitable sortable" style="text-align: center;"
|-
! rowspan="2" | [[Binary numeral system|Binary]] !! rowspan="2" | [[Octal|Oct]] !! rowspan="2" | [[Decimal|Dec]] !! rowspan="2" class=unsortable | [[Hexadecimal|Hex]] !! colspan="3"|Glyph
|-
! 1963 !! 1965 !! 1967
|-
|010 0000 ||style="background:lightblue;"| 040 || style="background:#cff;"| 32 ||style="background:lightblue;"| 20 ||colspan=3|&nbsp;[[space (punctuation)|space]] (no visible glyph)
|-
|010 0001 ||style="background:lightblue;"| 041 || style="background:#cff;"| 33 ||style="background:lightblue;"| 21 ||colspan=3|<span class="nounderlines">[[Exclamation mark|!]]</span>
|-
|010 0010 ||style="background:lightblue;"| 042 || style="background:#cff;"| 34 ||style="background:lightblue;"| 22 ||colspan=3|<span class="nounderlines">[[Quotation mark|"]]</span>
|-
|010 0011 ||style="background:lightblue;"| 043 || style="background:#cff;"| 35 ||style="background:lightblue;"| 23 ||colspan=3|<span class="nounderlines">[[Number sign|#]]</span>
|-
|010 0100 ||style="background:lightblue;"| 044 || style="background:#cff;"| 36 ||style="background:lightblue;"| 24 ||colspan=3|<span class="nounderlines">[[Dollar sign|$]]</span>
|-
|010 0101 ||style="background:lightblue;"| 045 || style="background:#cff;"| 37 ||style="background:lightblue;"| 25 ||colspan=3|<span class="nounderlines">[[Percent sign|%]]</span>
|-
|010 0110 ||style="background:lightblue;"| 046 || style="background:#cff;"| 38 ||style="background:lightblue;"| 26 ||colspan=3|<span class="nounderlines">[[Ampersand|&]]</span>
|-
|010 0111 ||style="background:lightblue;"| 047 || style="background:#cff;"| 39 ||style="background:lightblue;"| 27 ||colspan=3|<span class="nounderlines">[[Apostrophe|']]</span>
|-
|010 1000 ||style="background:lightblue;"| 050 || style="background:#cff;"| 40 ||style="background:lightblue;"| 28 ||colspan=3|<span class="nounderlines">[[Left parenthesis|(]]</span>
|-
|010 1001 ||style="background:lightblue;"| 051 || style="background:#cff;"| 41 ||style="background:lightblue;"| 29 ||colspan=3|<span class="nounderlines">[[Right parenthesis|)]]</span>
|-
|010 1010 ||style="background:lightblue;"| 052 || style="background:#cff;"| 42 ||style="background:lightblue;"| 2A ||colspan=3|<span class="nounderlines">[[Asterisk|*]]</span>
|-
|010 1011 ||style="background:lightblue;"| 053 || style="background:#cff;"| 43 ||style="background:lightblue;"| 2B ||colspan=3|<span class="nounderlines">[[Plus sign|+]]</span>
|-
|010 1100 ||style="background:lightblue;"| 054 || style="background:#cff;"| 44 ||style="background:lightblue;"| 2C ||colspan=3|<span class="nounderlines">[[Comma|,]]</span>
|-
|010 1101 ||style="background:lightblue;"| 055 || style="background:#cff;"| 45 ||style="background:lightblue;"| 2D ||colspan=3|<span class="nounderlines">[[Hyphen-minus|-]]</span>
|-
|010 1110 ||style="background:lightblue;"| 056 || style="background:#cff;"| 46 ||style="background:lightblue;"| 2E ||colspan=3|<span class="nounderlines">[[Full stop|.]]</span>
|-
|010 1111 ||style="background:lightblue;"| 057 || style="background:#cff;"| 47 ||style="background:lightblue;"| 2F ||colspan=3|<span class="nounderlines">[[Slash (punctuation)|/]]</span>
|-
|011 0000 ||style="background:lightblue;"| 060 || style="background:#cff;"| 48 ||style="background:lightblue;"| 30 ||colspan=3|<span class="nounderlines">[[0 (number)|0]]</span>
|-
|011 0001 ||style="background:lightblue;"| 061 || style="background:#cff;"| 49 ||style="background:lightblue;"| 31 ||colspan=3|<span class="nounderlines">[[1 (number)|1]]</span>
|-
|011 0010 ||style="background:lightblue;"| 062 || style="background:#cff;"| 50 ||style="background:lightblue;"| 32 ||colspan=3|<span class="nounderlines">[[2 (number)|2]]</span>
|-
|011 0011 ||style="background:lightblue;"| 063 || style="background:#cff;"| 51 ||style="background:lightblue;"| 33 ||colspan=3|<span class="nounderlines">[[3 (number)|3]]</span>
|-
|011 0100 ||style="background:lightblue;"| 064 || style="background:#cff;"| 52 ||style="background:lightblue;"| 34 ||colspan=3|<span class="nounderlines">[[4 (number)|4]]</span>
|-
|011 0101 ||style="background:lightblue;"| 065 || style="background:#cff;"| 53 ||style="background:lightblue;"| 35 ||colspan=3|<span class="nounderlines">[[5 (number)|5]]</span>
|-
|011 0110 ||style="background:lightblue;"| 066 || style="background:#cff;"| 54 ||style="background:lightblue;"| 36 ||colspan=3|<span class="nounderlines">[[6 (number)|6]]</span>
|-
|011 0111 ||style="background:lightblue;"| 067 || style="background:#cff;"| 55 ||style="background:lightblue;"| 37 ||colspan=3|<span class="nounderlines">[[7 (number)|7]]</span>
|-
|011 1000 ||style="background:lightblue;"| 070 || style="background:#cff;"| 56 ||style="background:lightblue;"| 38 ||colspan=3|<span class="nounderlines">[[8 (number)|8]]</span>
|-
|011 1001 ||style="background:lightblue;"| 071 || style="background:#cff;"| 57 ||style="background:lightblue;"| 39 ||colspan=3|<span class="nounderlines">[[9 (number)|9]]</span>
|-
|011 1010 ||style="background:lightblue;"| 072 || style="background:#cff;"| 58 ||style="background:lightblue;"| 3A ||colspan=3|<span class="nounderlines">[[Colon (punctuation)|:]]</span>
|-
|011 1011 ||style="background:lightblue;"| 073 || style="background:#cff;"| 59 ||style="background:lightblue;"| 3B ||colspan=3|<span class="nounderlines">[[Semicolon|;]]</span>
|-
|011 1100 ||style="background:lightblue;"| 074 || style="background:#cff;"| 60 ||style="background:lightblue;"| 3C ||colspan=3|<span class="nounderlines">[[Less-than sign|<]]</span>
|-
|011 1101 ||style="background:lightblue;"| 075 || style="background:#cff;"| 61 ||style="background:lightblue;"| 3D ||colspan=3|<span class="nounderlines">[[Equals sign|=]]</span>
|-
|011 1110 ||style="background:lightblue;"| 076 || style="background:#cff;"| 62 ||style="background:lightblue;"| 3E ||colspan=3|<span class="nounderlines">[[Greater-than sign|>]]</span>
|-
|011 1111 ||style="background:lightblue;"| 077 || style="background:#cff;"| 63 ||style="background:lightblue;"| 3F ||colspan=3|<span class="nounderlines">[[Question mark|?]]</span>
|-
|100 0000 ||style="background:lightblue;"| 100 || style="background:#cff;"| 64 ||style="background:lightblue;"| 40 || <span class="nounderlines">[[At sign|@]]</span> || <span class="nounderlines">[[`]]</span> || <span class="nounderlines">[[At sign|@]]</span>
|-
|100 0001 ||style="background:lightblue;"| 101 || style="background:#cff;"| 65 ||style="background:lightblue;"| 41 ||colspan=3|<span class="nounderlines">[[A]]</span>
|-
|100 0010 ||style="background:lightblue;"| 102 || style="background:#cff;"| 66 ||style="background:lightblue;"| 42 ||colspan=3|<span class="nounderlines">[[B]]</span>
|-
|100 0011 ||style="background:lightblue;"| 103 || style="background:#cff;"| 67 ||style="background:lightblue;"| 43 ||colspan=3|<span class="nounderlines">[[C]]</span>
|-
|100 0100 ||style="background:lightblue;"| 104 || style="background:#cff;"| 68 ||style="background:lightblue;"| 44 ||colspan=3|<span class="nounderlines">[[D]]</span>
|-
|100 0101 ||style="background:lightblue;"| 105 || style="background:#cff;"| 69 ||style="background:lightblue;"| 45 ||colspan=3|<span class="nounderlines">[[E]]</span>
|-
|100 0110 ||style="background:lightblue;"| 106 || style="background:#cff;"| 70 ||style="background:lightblue;"| 46 ||colspan=3|<span class="nounderlines">[[F]]</span>
|-
|100 0111 ||style="background:lightblue;"| 107 || style="background:#cff;"| 71 ||style="background:lightblue;"| 47 ||colspan=3|<span class="nounderlines">[[G]]</span>
|-
|100 1000 ||style="background:lightblue;"| 110 || style="background:#cff;"| 72 ||style="background:lightblue;"| 48 ||colspan=3|<span class="nounderlines">[[H]]</span>
|-
|100 1001 ||style="background:lightblue;"| 111 || style="background:#cff;"| 73 ||style="background:lightblue;"| 49 ||colspan=3|<span class="nounderlines">[[I]]</span>
|-
|100 1010 ||style="background:lightblue;"| 112 || style="background:#cff;"| 74 ||style="background:lightblue;"| 4A ||colspan=3|<span class="nounderlines">[[J]]</span>
|-
|100 1011 ||style="background:lightblue;"| 113 || style="background:#cff;"| 75 ||style="background:lightblue;"| 4B ||colspan=3|<span class="nounderlines">[[K]]</span>
|-
|100 1100 ||style="background:lightblue;"| 114 || style="background:#cff;"| 76 ||style="background:lightblue;"| 4C ||colspan=3|<span class="nounderlines">[[L]]</span>
|-
|100 1101 ||style="background:lightblue;"| 115 || style="background:#cff;"| 77 ||style="background:lightblue;"| 4D ||colspan=3|<span class="nounderlines">[[M]]</span>
|-
|100 1110 ||style="background:lightblue;"| 116 || style="background:#cff;"| 78 ||style="background:lightblue;"| 4E ||colspan=3|<span class="nounderlines">[[N]]</span>
|-
|100 1111 ||style="background:lightblue;"| 117 || style="background:#cff;"| 79 ||style="background:lightblue;"| 4F ||colspan=3|<span class="nounderlines">[[O]]</span>
|-
|101 0000 ||style="background:lightblue;"| 120 || style="background:#cff;"| 80 ||style="background:lightblue;"| 50 ||colspan=3|<span class="nounderlines">[[P]]</span>
|-
|101 0001 ||style="background:lightblue;"| 121 || style="background:#cff;"| 81 ||style="background:lightblue;"| 51 ||colspan=3|<span class="nounderlines">[[Q]]</span>
|-
|101 0010 ||style="background:lightblue;"| 122 || style="background:#cff;"| 82 ||style="background:lightblue;"| 52 ||colspan=3|<span class="nounderlines">[[R]]</span>
|-
|101 0011 ||style="background:lightblue;"| 123 || style="background:#cff;"| 83 ||style="background:lightblue;"| 53 ||colspan=3|<span class="nounderlines">[[S]]</span>
|-
|101 0100 ||style="background:lightblue;"| 124 || style="background:#cff;"| 84 ||style="background:lightblue;"| 54 ||colspan=3|<span class="nounderlines">[[T]]</span>
|-
|101 0101 ||style="background:lightblue;"| 125 || style="background:#cff;"| 85 ||style="background:lightblue;"| 55 ||colspan=3|<span class="nounderlines">[[U]]</span>
|-
|101 0110 ||style="background:lightblue;"| 126 || style="background:#cff;"| 86 ||style="background:lightblue;"| 56 ||colspan=3|<span class="nounderlines">[[V]]</span>
|-
|101 0111 ||style="background:lightblue;"| 127 || style="background:#cff;"| 87 ||style="background:lightblue;"| 57 ||colspan=3|<span class="nounderlines">[[W]]</span>
|-
|101 1000 ||style="background:lightblue;"| 130 || style="background:#cff;"| 88 ||style="background:lightblue;"| 58 ||colspan=3|<span class="nounderlines">[[X]]</span>
|-
|101 1001 ||style="background:lightblue;"| 131 || style="background:#cff;"| 89 ||style="background:lightblue;"| 59 ||colspan=3|<span class="nounderlines">[[Y]]</span>
|-
|101 1010 ||style="background:lightblue;"| 132 || style="background:#cff;"| 90 ||style="background:lightblue;"| 5A ||colspan=3|<span class="nounderlines">[[Z]]</span>
|-
|101 1011 ||style="background:lightblue;"| 133 || style="background:#cff;"| 91 ||style="background:lightblue;"| 5B ||colspan=3|<span class="nounderlines">[[Left square bracket|<nowiki>[</nowiki>]]</span>
|-
|101 1100 ||style="background:lightblue;"| 134 || style="background:#cff;"| 92 ||style="background:lightblue;"| 5C || <span class="nounderlines">[[Backslash|\]]</span> || <span class="nounderlines">[[Tilde|~]]</span> || <span class="nounderlines">[[Backslash|\]]</span>
|-
|101 1101 ||style="background:lightblue;"| 135 || style="background:#cff;"| 93 ||style="background:lightblue;"| 5D ||colspan=3|<span class="nounderlines">[[Right square bracket|<nowiki>]</nowiki>]]</span>
|-
|101 1110 ||style="background:lightblue;"| 136 || style="background:#cff;"| 94 ||style="background:lightblue;"| 5E || <span class="nounderlines">[[Up arrow (symbol)|↑]]</span> ||colspan=2|<span class="nounderlines">[[Caret (computing)|^]]</span>
|-
|101 1111 ||style="background:lightblue;"| 137 || style="background:#cff;"| 95 ||style="background:lightblue;"| 5F || <span class="nounderlines">[[Left arrow (symbol)|←]]</span> ||colspan=2|<span class="nounderlines">[[Underscore|_]]</span>
|-
|110 0000 ||style="background:lightblue;"| 140 || style="background:#cff;"| 96 ||style="background:lightblue;"| 60 || || <span class="nounderlines">[[At sign|@]]</span> || <span class="nounderlines">[[`]]</span>
|-
|110 0001 ||style="background:lightblue;"| 141 || style="background:#cff;"| 97 ||style="background:lightblue;"| 61 || ||colspan=2|<span class="nounderlines">[[a]]</span>
|-
|110 0010 ||style="background:lightblue;"| 142 || style="background:#cff;"| 98 ||style="background:lightblue;"| 62 || ||colspan=2|<span class="nounderlines">[[b]]</span>
|-
|110 0011 ||style="background:lightblue;"| 143 || style="background:#cff;"| 99 ||style="background:lightblue;"| 63 || ||colspan=2|<span class="nounderlines">[[c]]</span>
|-
|110 0100 ||style="background:lightblue;"| 144 || style="background:#cff;"| 100 ||style="background:lightblue;"| 64 || ||colspan=2|<span class="nounderlines">[[d]]</span>
|-
|110 0101 ||style="background:lightblue;"| 145 || style="background:#cff;"| 101 ||style="background:lightblue;"| 65 || ||colspan=2|<span class="nounderlines">[[e]]</span>
|-
|110 0110 ||style="background:lightblue;"| 146 || style="background:#cff;"| 102 ||style="background:lightblue;"| 66 || ||colspan=2|<span class="nounderlines">[[f]]</span>
|-
|110 0111 ||style="background:lightblue;"| 147 || style="background:#cff;"| 103 ||style="background:lightblue;"| 67 || ||colspan=2|<span class="nounderlines">[[g]]</span>
|-
|110 1000 ||style="background:lightblue;"| 150 || style="background:#cff;"| 104 ||style="background:lightblue;"| 68 || ||colspan=2|<span class="nounderlines">[[h]]</span>
|-
|110 1001 ||style="background:lightblue;"| 151 || style="background:#cff;"| 105 ||style="background:lightblue;"| 69 || ||colspan=2|<span class="nounderlines">[[i]]</span>
|-
|110 1010 ||style="background:lightblue;"| 152 || style="background:#cff;"| 106 ||style="background:lightblue;"| 6A || ||colspan=2|<span class="nounderlines">[[j]]</span>
|-
|110 1011 ||style="background:lightblue;"| 153 || style="background:#cff;"| 107 ||style="background:lightblue;"| 6B || ||colspan=2|<span class="nounderlines">[[k]]</span>
|-
|110 1100 ||style="background:lightblue;"| 154 || style="background:#cff;"| 108 ||style="background:lightblue;"| 6C || ||colspan=2|<span class="nounderlines">[[l]]</span>
|-
|110 1101 ||style="background:lightblue;"| 155 || style="background:#cff;"| 109 ||style="background:lightblue;"| 6D || ||colspan=2|<span class="nounderlines">[[m]]</span>
|-
|110 1110 ||style="background:lightblue;"| 156 || style="background:#cff;"| 110 ||style="background:lightblue;"| 6E || ||colspan=2|<span class="nounderlines">[[n]]</span>
|-
|110 1111 ||style="background:lightblue;"| 157 || style="background:#cff;"| 111 ||style="background:lightblue;"| 6F || ||colspan=2|<span class="nounderlines">[[o]]</span>
|-
|111 0000 ||style="background:lightblue;"| 160 || style="background:#cff;"| 112 ||style="background:lightblue;"| 70 || ||colspan=2|<span class="nounderlines">[[p]]</span>
|-
|111 0001 ||style="background:lightblue;"| 161 || style="background:#cff;"| 113 ||style="background:lightblue;"| 71 || ||colspan=2|<span class="nounderlines">[[q]]</span>
|-
|111 0010 ||style="background:lightblue;"| 162 || style="background:#cff;"| 114 ||style="background:lightblue;"| 72 || ||colspan=2|<span class="nounderlines">[[r]]</span>
|-
|111 0011 ||style="background:lightblue;"| 163 || style="background:#cff;"| 115 ||style="background:lightblue;"| 73 || ||colspan=2|<span class="nounderlines">[[s]]</span>
|-
|111 0100 ||style="background:lightblue;"| 164 || style="background:#cff;"| 116 ||style="background:lightblue;"| 74 || ||colspan=2|<span class="nounderlines">[[t]]</span>
|-
|111 0101 ||style="background:lightblue;"| 165 || style="background:#cff;"| 117 ||style="background:lightblue;"| 75 || ||colspan=2|<span class="nounderlines">[[u]]</span>
|-
|111 0110 ||style="background:lightblue;"| 166 || style="background:#cff;"| 118 ||style="background:lightblue;"| 76 || ||colspan=2|<span class="nounderlines">[[v]]</span>
|-
|111 0111 ||style="background:lightblue;"| 167 || style="background:#cff;"| 119 ||style="background:lightblue;"| 77 || ||colspan=2|<span class="nounderlines">[[w]]</span>
|-
|111 1000 ||style="background:lightblue;"| 170 || style="background:#cff;"| 120 ||style="background:lightblue;"| 78 || ||colspan=2|<span class="nounderlines">[[x]]</span>
|-
|111 1001 ||style="background:lightblue;"| 171 || style="background:#cff;"| 121 ||style="background:lightblue;"| 79 || ||colspan=2|<span class="nounderlines">[[y]]</span>
|-
|111 1010 ||style="background:lightblue;"| 172 || style="background:#cff;"| 122 ||style="background:lightblue;"| 7A || ||colspan=2|<span class="nounderlines">[[z]]</span>
|-
|111 1011 ||style="background:lightblue;"| 173 || style="background:#cff;"| 123 ||style="background:lightblue;"| 7B || ||colspan=2|<span class="nounderlines">[[Left curly bracket|{]]</span>
|-
|111 1100 ||style="background:lightblue;"| 174 || style="background:#cff;"| 124 ||style="background:lightblue;"| 7C || [[Acknowledge character|ACK]] || <span class="nounderlines">[[Not sign|¬]]</span> || <span class="nounderlines">[[Vertical bar|<nowiki>|</nowiki>]]</span>
|-
|111 1101 ||style="background:lightblue;"| 175 || style="background:#cff;"| 125 ||style="background:lightblue;"| 7D || ||colspan=2|<span class="nounderlines">[[Right curly bracket|}]]</span>
|-
|111 1110 ||style="background:lightblue;"| 176 || style="background:#cff;"| 126 ||style="background:lightblue;"| 7E || [[Escape character|ESC]] || <span class="nounderlines">[[Vertical bar|<nowiki>|</nowiki>]]</span> || <span class="nounderlines">[[Tilde|~]]</span>
|}