Editing Lock key (section)

==Status LEDs==
[[File:Lock LED cluster.jpg|200px|thumb|Typical LED cluster of a mid-90s keyboard]]

Each lock state typically has an associated [[light-emitting diode|LED]] on the keyboard. Early IBM PC keyboards lacked these LEDs; support for two-way communication with LED control was introduced with the [[AT keyboard interface]], and IBM AT keyboards featured a bank of LEDs at the top right. [[IBM Model M|Model M]] and [[IBM Model F|Model F]] keyboards without status LEDs are the older models that use the [[XT keyboard interface]].

The number of lock keys varies by keyboard. [[Numeric keypad]]s may feature a single num lock LED; comparatively, [[tenkeyless]] keyboards will lack the num lock LED, just as they lack the numeric keypad. Some keyboards such as the [[Chicony KB-5591]] have extra lock LEDs, for example cursor lock. Typical PC keyboards feature [[num lock]], [[caps lock]], and [[scroll lock]] LEDs at the top right in that specific order; the status LED order has never changed in over twenty-five years.

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===Integrated LEDs===
[[File:Integrated lock key.jpg|200px|thumb|Integrated LED in the [[Matias Tactile Pro 3|Tactile Pro 3]]]]

On some keyboards, the status LEDs are integrated directly into the keys. The LED will be integrated into the switch or placed directly under or beside the switch, and the keycap will have a window to let the light through.

Several Cherry switch families including [[Cherry MX]] and [[Cherry M8]] support integrated LEDs. [[Matias switch]]es have transparent shells to permit light to shine through from an LED under the switch, as the Alps switch design does not have space to support an LED without removing the [[click leaf]]; [[Alps SKCL/SKCM series|Alps SKCL/SKCM]] and [[Alps SKBL/SKBM series|SKBL/SKBM]] switches and clone families do support integrated LEDs, and these switches are always linear.

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