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keyboard
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xinput
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URL:
https://askubuntu.com/q/1037199
Title:
Why is my keyboard "raw" as opposed to "translated"?
ID:
/2018/05/17/Why-is-my-keyboard-_raw_-as-opposed-to-_translated__
Created:
May 17, 2018
Edited: June 12, 2020
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AT = IBM PC/AT (Advanced Technology)
This is what an IBM PC/AT looks like:
Image credit: Wikipedia
There are three types of IBM Keyboard scan code sets in the PC world:
- Set 1 IBM PC/XT (had one of those)
- Set 2 IBM PC/AT (yup had one of those too)
- Set 3 IBM PC/3270 (Has 24 function keys like IBM Mainframe, S/36, S/38 and AS/400 terminals).
From wikipedia:
For computers since the IBM PC AT, the keyboard controller on the motherboard translates AT (set 2) scancodes into XT (set 1) scancodes in so called translation mode.[3] This translation can be disabled in pass-through-mode, allowing the raw scancodes to be seen.[4] Therefore, whether a software developer will encounter AT scancodes or XT scancodes on a modern PC-compatible depends on how the keyboard is being accessed.
A compliant PS/2 keyboard can be told to send scancodes in set 1, 2 or 3.
Your question focuses on the IBM PC/AT as pictured above which BTW is a very nice mechanical keyboard that cost $300 in 1995 when I bought one for a Gateway Tower PC.