ASCII format for network interchange
RFC 20
Document | Type |
RFC - Internet Standard
(October 1969; Errata)
Status changed by status-change-rfc20-ascii-format-to-standard
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Authors | |||
Last updated | 2020-07-29 | ||
Stream | Legacy | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Stream | Legacy state | (None) | |
Consensus Boilerplate | Unknown | ||
RFC Editor Note | (None) | ||
IESG | IESG state | RFC 20 (Internet Standard) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group Vint Cerf Request for Comments: 20 UCLA October 16, 1969 ASCII format for Network Interchange For concreteness, we suggest the use of standard 7-bit ASCII embedded in an 8 bit byte whose high order bit is always 0. This leads to the standard code given on the attached page, copies from USAS X3, 4- 1968. This code will be used over HOST-HOST primary connections. Break characters will be defined by the receiving remote host, e.g. SRI uses "." (ASCII X'2E' or 2/14) as the end-of-line character, where as UCLA uses X'OD' or 0/13 (carriage return). USA Standard Code for Information Interchange 1. Scope This coded character set is to be used for the general interchange of information among information processing systems, communication systems, and associated equipment. Cert [Page 1] RFC 20 ASCII format for Network Interchange October 1969 2. Standard Code |----------------------------------------------------------------------| B \ b7 ------------>| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | I \ b6 ---------->| 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | T \ b5 -------->| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | S |-----------------------------------------------| COLUMN->| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |b4 |b3 |b2 |b1 | ROW | | | | | | | | | +----------------------+-----------------------------------------------+ | 0 | 0 | 0 | 0 | 0 | NUL | DLE | SP | 0 | @ | P | ` | p | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 0 | 0 | 1 | 1 | SOH | DC1 | ! | 1 | A | Q | a | q | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 0 | 1 | 0 | 2 | STX | DC2 | " | 2 | B | R | b | r | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 0 | 1 | 1 | 3 | ETX | DC3 | # | 3 | C | S | c | s | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 1 | 0 | 0 | 4 | EOT | DC4 | $ | 4 | D | T | d | t | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 1 | 0 | 1 | 5 | ENQ | NAK | % | 5 | E | U | e | u | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 1 | 1 | 0 | 6 | ACK | SYN | & | 6 | F | V | f | v | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 0 | 1 | 1 | 1 | 7 | BEL | ETB | ' | 7 | G | W | g | w | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 0 | 0 | 0 | 8 | BS | CAN | ( | 8 | H | X | h | x | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 0 | 0 | 1 | 9 | HT | EM | ) | 9 | I | Y | i | y | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 0 | 1 | 0 | 10 | LF | SUB | * | : | J | Z | j | z | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 0 | 1 | 1 | 11 | VT | ESC | + | ; | K | [ | k | { | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 1 | 0 | 0 | 12 | FF | FS | , | < | L | \ | l | | | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 1 | 0 | 1 | 13 | CR | GS | - | = | M | ] | m | } | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 1 | 1 | 0 | 14 | SO | RS | . | > | N | ^ | n | ~ | |---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----| | 1 | 1 | 1 | 1 | 15 | SI | US | / | ? | O | _ | o | DEL | +----------------------+-----------------------------------------------+ Cert [Page 2] RFC 20 ASCII format for Network Interchange October 1969 3. Character Representation and Code Identification The standard 7-bit character representation, with b7 the high-order bit and b1 the low-order bit, is shown below: EXAMPLE: The bit representation for the character "K," positioned in column 4, row 11, is b7 b6 b5 b4 b3 b2 b1 1 0 0 1 0 1 1 The code table position for the character "K" may also be represented by the notation "column 4, row 11" or alternatively as "4/11." The decimal equivalent of the binary number formed by bits b7, b6, and b5, collectively, forms the column number, and the decimal equivalent of the binary number formed by bits b4, b3, b2, and b1, collectively, forms the row number. The standard code may be identified by the use of the notation ASCIIShow full document text