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added comment for 5576 keyb

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Akamaki
2024-08-16 23:56:25 +09:00
committed by GitHub
parent 3c6695cdea
commit c3b2ddfcb1
1 changed files with 6 additions and 4 deletions
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src/device/keyboard_at.c
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@@ -1631,21 +1631,23 @@ static const scancode scancode_set3[512] = {
};
/* IBM Japan 5576-001, 002 and 003 keyboards have three extra scancode sets; 81h, 82h, 8ah.
Scancode set 81h and 82h are not implemented yet.
To implement them, we need take the following into consideration.
* Add a UI to switch the type of keyboards and keyboard IDs.
* Add modified scancode set 1 and 2 (in these modes, language input keys are used as an alternative key).
* Japanese keyboards traditionally use a typewriter layout. Its key mapping doesn't match with foreign keyboards.
* Japanese keyboards traditionally use a bit-paired layout. Its key mapping doesn't match with foreign keyboards.
5576 keyboards kept 101-key compatible scancode sets because PS/55 had to support western (PS/2) versions of operating systems.
The default scancode set is 2.
In Japanese DOS, the keyboard driver confirms its keyboard ID, and sends a command to switch the scancode set to 8Ah.
Japanese OS/2 and Windows use the scancode set 82h.
The OADG standard and modern Japanese keyboards use the same keyboard ID and scancode set number as PS/2 keyboards use.
The OADG standard (1991-) and modern Japanese keyboards use the same keyboard ID and scancode set number as PS/2 keyboards use.
Three extra scancode sets are no longer available. Instead, language input keys are available in scancode set 1 and 2.
However, it has a different key mapping.
However, their physical key layout is a bit-paired layout.
Users have to choose the correct keyboard layout on setup, and the driver needs to remap keys.
Currently, scancode set 81h and 82h are not implemented yet. Also, the key layout is designed to match with the Japanese keyboard.
[Japanese DOS and keyboard scancode set]
| | K3.3 | J4.0 | J5.0 | J4.0/V | J5.0/V | OS/2 J1.3 | PC DOS 5 |
|---------------------------|:----:|:----:|:----:|:------:|:------:|:---------:|:--------:|