Editing ANSI vs ISO (section)

==Layouts==
===ANSI===
ANSI layout keyboards are used in the United States and the Netherlands amongst other countries. PC keyboards using the ANSI layout as used by the [[IBM Model M]] are typically referred to as '''101-key''' (pre-1995), '''104-key''' (with the Windows and context menu keys added), and '''87-key''' (standard tenkeyless layout). The main cluster of keys is laid out thus:

[[File:ANSI layout basic.svg|center]]

The blue and purple keys illustrate the keys that differ from ISO.

===ISO===
ISO keyboards are used by many European countries, and with one extra key compared to ANSI keyboards, are correspondingly referred to as '''102-key''', '''105-key''' and '''88-key''' for PCs.

[[File:ISO layout basic.svg|center]]

The pink and purple keys illustrate the keys that differ from ANSI. In addition to having one extra key, the ISO layout has another fundamental property: the right [[Alt key]] is replaced with the [[Alt Gr key]], which is a typographic meta key that accesses the third symbol on a keyboard. The use of accents in European languages leads to the need to enter many more symbols than in the US, with keys having increased symbol overloading. For example, in the UK, the "4" key will produce "$" with the [[Shift key]] held, and "€" with the Alt Gr key held.