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[Docs] Update how_keyboards_work.md (#6528)

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* Update how_keyboards_work.md

bridged the gap between scancodes and keycodes, the doc didn't make the distinction and was ambiguous.

* Update docs/how_keyboards_work.md

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update docs/how_keyboards_work.md

fix typo

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
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madivad 2019-08-22 10:44:37 +10:00 • committed by Drashna Jaelre
commit 129e4d1b2f
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docs/how_keyboards_work.md
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@ -33,7 +33,11 @@ The firmware does not send actual letters or characters, but only scancodes.
Thus, by modifying the firmware, you can only modify what scancode is sent over Thus, by modifying the firmware, you can only modify what scancode is sent over
USB for a given key. USB for a given key.
## 3. What the Operating System Does ## 3. What the Event Input/Kernel Does
The *scancode* is mapped to a *keycode* dependent on the keyboard [60-keyboard.hwdb at Master](https://github.com/systemd/systemd/blob/master/hwdb/60-keyboard.hwdb). Without this mapping, the operating system will not receive a valid keycode and will be unable to do anything useful with that key press.
## 4. What the Operating System Does
Once the keycode reaches the operating system, a piece of software has to have Once the keycode reaches the operating system, a piece of software has to have
it match an actual character thanks to a keyboard layout. For example, if your it match an actual character thanks to a keyboard layout. For example, if your