Reference sheets · 1969
ASCII: USA Standard Code for Information Interchange
Reference sheet · RFC 20 · USAS X3.4-1968
The 128 codes of 7-bit ASCII with their decimal and hexadecimal values and names, as RFC 20 gives them.
Read the text The whole poster as a web page
- Print from
- A3
- License
- MIT (compilation); data: RFC 20 (USAS X3.4-1968)
- Source
- rfc-editor.org
- Retrieved
- 27 September 2026
- Language
- English
- Rights holder
- vodhash, 2026 (compilation); RFC 20: Vint Cerf, 1969
Theme
Download
- A seriesPrints at A0, A1, A2 or A3
- 50 × 70 cm
- 60 × 80 cm
Every Reference sheets poster, in every format and theme, as one zip from the latest release.
Print from A3: the smallest A size at which the body text is at least 8 pt.
Wallpaper
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Edition
RFC Editor plain-text edition of RFC 20 (put into machine readable form by Robbie Bennet in September 1999), sections 2 (Standard Code) and 4 (Legend). The 128 positions of the code table, the control abbreviations and names of legend 4.1 and the graphic names of legend 4.2, with their group marks (CC), (FE) and (IS) and their note numbers, were extracted by script from that file. The decimal and hexadecimal values are computed from the column and row of each position (16 times the column plus the row), as section 3 defines them. In each cell the group mark is set as a tag after the name, the note numbers as a superscript, and the alternative names in parentheses in italic. The legend’s “File Separator IS)” is set as “File Separator (IS)”. Letters and digits have no name in the legend and get none. The notes, the explanation of the table and the lists of groups were written for this sheet from sections 1, 3, 4, 5 and 6 of RFC 20; the Internet Standard status comes from the RFC Editor’s page https://www.rfc-editor.org/info/rfc20 (STD 80).
Rights
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction [...] (MIT License of this repository, LICENSE)
The sheet follows RFC 20, https://www.rfc-editor.org/rfc/rfc20.txt, which carries no copyright notice and no distribution statement; the code values and names are facts of the standard. RFC Editor FAQ (https://www.rfc-editor.org/faq/): “All RFCs may be freely reproduced and translated (unmodified).” IETF Trust FAQ (https://trustee.ietf.org/about/faq/): “Since the beginning of the RFC series, reproduction of whole RFCs (including translation into a language other than English) has been allowed and encouraged. The IETF Trust and the RFC Editor place no restrictions on this.”, and on RFCs that predate the IETF: “numerous RFCs were published prior to the existence of the IETF (i.e. prior to January 1986). The IETF Trust cannot offer definitive advice in these cases.” For extracts, the same FAQ says that “the IETF Trust will tolerate fair use of other extracts, but you must indicate the source of the extract”: the footer names RFC 20 and its URL. The names of the legend are the only words taken from the RFC.
