The arrangement of the character input keys and the Shift keys contained in this layout is specified in the US national standard ANSI- INCITS 154-1988 (R1999) (formerly ANSI X3.154-1988 (R1999)), where this layout is called " ASCII keyboard". Support for the diacritics needed for Scots Gaelic and Welsh was added to Windows and ChromeOS using a "UK-extended" setting (see below) Linux and X-Windows systems have an explicit or redesignated compose key for this purpose. The E00 key (left of 1) with AltGr provides either vertical bar (|) ( OS/2's UK166 keyboard layout, Linux/ X11 UK keyboard layout) or broken bar (¦) (Windows UK/Ireland keyboard layout).Windows UK/Ireland keyboard layout and Linux/ X11 UK/Ireland keyboard layout), rather than the broken bar (¦) assigned by BS 4822 and provided in some systems (e.g. The B00 key (left of Z), shifted, results in vertical bar (|) on some systems (e.g.Therefore, various manufacturers have modified or extended the BS 4822 standard: It also lacked support for various diacritics used in the Welsh alphabet, and the Scottish Gaelic alphabet and also is missing the letter yogh, ȝ, used very rarely in the Scots language. It also assigned a key for the non-ASCII character broken bar (¦), but lacks one for the far more commonly used ASCII character vertical bar (|). The BS 4822:1994 standard did not make any use of the AltGr key and lacked support for any non-ASCII characters other than ¬ and £. It is very similar to that of the United States, but has an AltGr key and a larger Enter key, includes £ and € signs and some rarely used EBCDIC symbols (¬, ¦), and uses different positions for the characters ", #, ~, \, and |. The United Kingdom and Ireland use a keyboard layout based on the 48-key version defined in the (now withdrawn) British Standard BS 4822.
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