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# ASCII character encoding

"ASCII" stands for "American Standard Code for Information Interchange". The ASCII standard is a seven-bit code published by the United States of America Standards Institute (USASI) in 1968. The ASCII encoding forms the first half of ISO-8859-1 (Latin1) which in turn forms the first page of ISO 10646 (Unicode).

The Scheme 48 procedures `char->ascii` and `ascii->char` give access to the ASCII encoding.

n10 | n16 |  | Unicode name | n10 | n16 |  | Unicode name
`0` | `0` | NUL | null | `64` | `40` | `@` | commercial at
`1` | `1` | SOH | start of heading | `65` | `41` | `A` | latin capital letter a
`2` | `2` | STX | start of text | `66` | `42` | `B` | latin capital letter b
`3` | `3` | ETX | end of text | `67` | `43` | `C` | latin capital letter c
`4` | `4` | EOT | end of transmission | `68` | `44` | `D` | latin capital letter d
`5` | `5` | ENQ | enquiry | `69` | `45` | `E` | latin capital letter e
`6` | `6` | ACK | acknowledge | `70` | `46` | `F` | latin capital letter f
`7` | `7` | BEL | bell | `71` | `47` | `G` | latin capital letter g
`8` | `8` | BS | backspace | `72` | `48` | `H` | latin capital letter h
`9` | `9` | HT | horizontal tabulation | `73` | `49` | `I` | latin capital letter i
`10` | `A` | LF | line feed | `74` | `4A` | `J` | latin capital letter j
`11` | `B` | VT | vertical tabulation | `75` | `4B` | `K` | latin capital letter k
`12` | `C` | FF | form feed | `76` | `4C` | `L` | latin capital letter l
`13` | `D` | CR | carriage return | `77` | `4D` | `M` | latin capital letter m
`14` | `E` | SO | shift out | `78` | `4E` | `N` | latin capital letter n
`15` | `F` | SI | shift in | `79` | `4F` | `O` | latin capital letter o
`16` | `10` | DLE | data link escape | `80` | `50` | `P` | latin capital letter p
`17` | `11` | DC1 | device control one | `81` | `51` | `Q` | latin capital letter q
`18` | `12` | DC2 | device control two | `82` | `52` | `R` | latin capital letter r
`19` | `13` | DC3 | device control three | `83` | `53` | `S` | latin capital letter s
`20` | `14` | DC4 | device control four | `84` | `54` | `T` | latin capital letter t
`21` | `15` | NAK | negative acknowledge | `85` | `55` | `U` | latin capital letter u
`22` | `16` | SYN | synchronous idle | `86` | `56` | `V` | latin capital letter v
`23` | `17` | ETB | end of transmission block | `87` | `57` | `W` | latin capital letter w
`24` | `18` | CAN | cancel | `88` | `58` | `X` | latin capital letter x
`25` | `19` | EM | end of medium | `89` | `59` | `Y` | latin capital letter y
`26` | `1A` | SUB | substitute | `90` | `5A` | `Z` | latin capital letter z
`27` | `1B` | ESC | escape | `91` | `5B` | `[` | left square bracket
`28` | `1C` | FS | file separator | `92` | `5C` | `\` | reverse solidus
`29` | `1D` | GS | group separator | `93` | `5D` | `]` | right square bracket
`30` | `1E` | RS | record separator | `94` | `5E` | `^` | circumflex accent
`31` | `1F` | US | unit separator | `95` | `5F` | `_` | low line
`32` | `20` | SPACE | space | `96` | `60` | ``` | grave accent
`33` | `21` | `!` | exclamation mark | `97` | `61` | `a` | latin small letter a
`34` | `22` | `"` | quotation mark | `98` | `62` | `b` | latin small letter b
`35` | `23` | `#` | number sign | `99` | `63` | `c` | latin small letter c
`36` | `24` | `$` | dollar sign | `100` | `64` | `d` | latin small letter d
`37` | `25` | `%` | percent sign | `101` | `65` | `e` | latin small letter e
`38` | `26` | `&` | ampersand | `102` | `66` | `f` | latin small letter f
`39` | `27` | `'` | apostrophe | `103` | `67` | `g` | latin small letter g
`40` | `28` | `(` | left parenthesis | `104` | `68` | `h` | latin small letter h
`41` | `29` | `)` | right parenthesis | `105` | `69` | `i` | latin small letter i
`42` | `2A` | `*` | asterisk | `106` | `6A` | `j` | latin small letter j
`43` | `2B` | `+` | plus sign | `107` | `6B` | `k` | latin small letter k
`44` | `2C` | `,` | comma | `108` | `6C` | `l` | latin small letter l
`45` | `2D` | `-` | hyphen-minus | `109` | `6D` | `m` | latin small letter m
`46` | `2E` | `.` | full stop | `110` | `6E` | `n` | latin small letter n
`47` | `2F` | `/` | solidus | `111` | `6F` | `o` | latin small letter o
`48` | `30` | `0` | digit zero | `112` | `70` | `p` | latin small letter p
`49` | `31` | `1` | digit one | `113` | `71` | `q` | latin small letter q
`50` | `32` | `2` | digit two | `114` | `72` | `r` | latin small letter r
`51` | `33` | `3` | digit three | `115` | `73` | `s` | latin small letter s
`52` | `34` | `4` | digit four | `116` | `74` | `t` | latin small letter t
`53` | `35` | `5` | digit five | `117` | `75` | `u` | latin small letter u
`54` | `36` | `6` | digit six | `118` | `76` | `v` | latin small letter v
`55` | `37` | `7` | digit seven | `119` | `77` | `w` | latin small letter w
`56` | `38` | `8` | digit eight | `120` | `78` | `x` | latin small letter x
`57` | `39` | `9` | digit nine | `121` | `79` | `y` | latin small letter y
`58` | `3A` | `:` | colon | `122` | `7A` | `z` | latin small letter z
`59` | `3B` | `;` | semicolon | `123` | `7B` | `{` | left curly bracket
`60` | `3C` | `<` | less-than sign | `124` | `7C` | `|` | vertical line
`61` | `3D` | `=` | equals sign | `125` | `7D` | `}` | right curly bracket
`62` | `3E` | `>` | greater-than sign | `126` | `7E` | `~` | tilde
`63` | `3F` | `?` | question mark | `127` | `7F` | DEL | delete

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