Anonymous user
PS/2 Keyboard: Difference between revisions
The keyboard reset transaction was not clear, the reset function does return ACK before the test result
| [unchecked revision] | [unchecked revision] |
(More scan code set 2) |
(The keyboard reset transaction was not clear, the reset function does return ACK before the test result) |
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| (47 intermediate revisions by 25 users not shown) | |||
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The PS/2 Keyboard is a device that talks to a PS/2 controller using [[PS/2|serial communication]]. Ideally, each different type of PS/2 controller driver should provide some sort of standard/simple "send byte/receive byte" interface, and the PS/2 Keyboard driver would use this interface without caring about lower level details (like what type of PS/2 controller the device is plugged into).
The PS/2 Keyboard accepts commands and sends responses to those commands, and also sends scan codes indicating when a key was pressed or released. Keep in mind that these scan codes (from the tables below) may be altered (i.e. translated) by the PS/2 controller, depending on the controller's settings.
== Commands ==
A PS/2 Keyboard accepts many types of commands. A command is one byte. Some commands have data byte/s which must be sent after the command byte. The keyboard typically responds to a command by sending either an "ACK" (to acknowledge the command) or a "Resend" (to say something was wrong with the previous command) back. Don't forget to wait between the command, the data and the response from keyboard.
The commands that a PS/2 Keyboard accepts are:
Line 28:
| ScrollLock
|-
|
| NumberLock
|-
|
| CapsLock
|}
Line 62:
| Set scan code set 3
|}
| Get/set current scan code set
| 0xFA (ACK) or 0xFE (Resend) if scan code is being set; 0xFA (ACK) then the scan code set number, or 0xFE (Resend) if you're getting the scancode. If getting the scancode the table indicates the value that identify each set:
{| {{wikitable}}
|-
! Value
! Use
|-
| 43
| Scan code set 1
|-
| 41
| Scan code set 2
|-
| 3f
| Scan code set 3
|}
|-
| 0xF2
| None
| Identify keyboard
| 0xFA (ACK) followed by none or more ID bytes (see [[
|-
| 0xF3
Line 81 ⟶ 96:
|-
| 5 to 6
| Delay before keys repeat (00b = 250 ms, 01b = 500 ms,
|-
| 7
Line 98 ⟶ 113:
| Disable scanning (keyboard won't send scan codes)
Note: May also restore default parameters
| 0xFA (ACK) or 0xFE (Resend)
|-
Line 153 ⟶ 163:
| None
| Reset and start self-test
| 0xFA (ACK) or 0xFE (Resend) followed by 0xAA (self-test passed), 0xFC or 0xFD (self test failed
|}
== Special Bytes ==
Line 176 ⟶ 185:
|-
| 0xFA
| Command acknowledged (ACK)
|-
| 0xFC and 0xFD
Line 189 ⟶ 198:
All other bytes sent by the keyboard are scan codes, where interpretation depends on the currently selected scan code set.
== Driver Model ==
Line 208 ⟶ 216:
Modern keyboards should support all three scan code sets, however some don't. Scan code set 2 (the default) is the only scan code set that is guaranteed to be supported. In theory (I haven't tried it) it should be possible to attempt to set scan code set 1 or scan code set 3, and then ask the keyboard which scan code it is currently using and see if it actually is using the requested scan code set. In this way it may be possible to determine which scan code sets the keyboard does support.
Scan codes themselves are sequences of one or more bytes. In some cases the sequence can be as many as 6 bytes (e.g. the
generates the sequence 0xE1, 0x1D, 0x45, 0xE1, 0x9D, 0xC5 when pressed). This situation isn't really ideal. In general (for later processing) you want to convert these "one or more byte sequences" into a single integer that uniquely identifies a specific key, that can be used effectively in things like lookup tables (without having sparsely used "many GiB" lookup tables).
Line 214 ⟶ 222:
Basically, when the keyboard driver's state machine knows it has received a complete scan code, the next step is to convert the "one or more byte" scan code into a key code.
=== Key Codes, Key States and Key Mappings ===
Line 232 ⟶ 239:
* Various other key states (shift, alt, control, etc)
* Various "toggle" states (CapsLock, ScrollLock, NumberLock, etc)
== Scan Code Sets ==
As there are 3 different scan code sets, there are 3 different tables (one for each scan code set). Some of the scan codes correspond to extra keys that have been added over time and have become "relatively standard". To help keep track scan codes have been categorized and tagged in the tables below. The tags used are:
{| {{wikitable}}
|-
! Tag
! Meaning
|-
| (keypad)
| A key that is on the numerics keypad (typically found on the right hand side of the keyboard).
|-
| (ACPI)
| A key that is part of the "ACPI" group of keys (typically found near the top of the keyboard). A lot of modern keyboards don't actually have these keys (if I remember right, they were fashionable in the late 1990's but have become less common since).
Note: Don't let the name fool you - these keys have nothing to do with ACPI at all and do behave like any other normal key (but could be useful for an OS that supports power management).
|-
| (multimedia)
| A key that is part of the multimedia group of keys (typically found near the top of the keyboard). A lot of modern keyboards do have at least some of these keys. Some of these keys are intended to be used for media players (volume control, play/pause, next track, previous track, etc), some are intended for web browsing (previous web page, next web page, refresh, favourites/bookmarks, etc), and and some are intended for launching applications (e.g. starting an email client, starting a calculator, opening "my computer", etc).
|}
=== Scan Code Set 1 ===
The following table shows which scan codes correspond to which keys when using scan code set 1 (for a "US QWERTY" keyboard only):
Note that scancodes with extended byte (E0) generates two different interrupts: the first containing the E0 byte, the second containing the scancode
{| {{wikitable}}
|-
Line 661 ⟶ 689:
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x10
| (multimedia) previous track pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x19
| style="background: #E8E8E8" | (multimedia) next track pressed
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
Line 671 ⟶ 717:
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x20
| (multimedia) mute pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x21
| style="background: #E8E8E8" | (multimedia) calculator pressed
| align="right" | 0xE0, 0x22
| (multimedia) play pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x24
| (multimedia) stop pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x2E
| (multimedia) volume down pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x30
| (multimedia) volume up pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x32
| (multimedia) WWW home pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
Line 739 ⟶ 821:
| style="background: #E8E8E8" align="right" | 0xE0, 0x5D
| style="background: #E8E8E8" | "apps" pressed
| align="right" | 0xE0, 0x5E
| (ACPI) power pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x5F
| style="background: #E8E8E8" | (ACPI) sleep pressed
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x63
| style="background: #E8E8E8" | (ACPI) wake pressed
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x65
| style="background: #E8E8E8" | (multimedia) WWW search pressed
| align="right" | 0xE0, 0x66
| (multimedia) WWW favorites pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x67
| style="background: #E8E8E8" | (multimedia) WWW refresh pressed
|-
| align="right" | 0xE0, 0x68
| (multimedia) WWW stop pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x69
| style="background: #E8E8E8" | (multimedia) WWW forward pressed
| align="right" | 0xE0, 0x6A
| (multimedia) WWW back pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x6B
| style="background: #E8E8E8" | (multimedia) my computer pressed
|-
| align="right" | 0xE0, 0x6C
| (multimedia) email pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x6D
| style="background: #E8E8E8" | (multimedia) media select pressed
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x90
| (multimedia) previous track released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x99
| style="background: #E8E8E8" | (multimedia) next track released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
Line 752 ⟶ 888:
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xA0
| (multimedia) mute released
| style="background: #E8E8E8" align="right" | 0xE0, 0xA1
| style="background: #E8E8E8" | (multimedia) calculator released
| align="right" | 0xE0, 0xA2
| (multimedia) play released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xA4
| (multimedia) stop released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xAE
| (multimedia) volume down released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xB0
| (multimedia) volume up released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xB2
| (multimedia) WWW home released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
Line 820 ⟶ 992:
| style="background: #E8E8E8" align="right" | 0xE0, 0xDD
| style="background: #E8E8E8" | "apps" released
| align="right" | 0xE0, 0xDE
| (ACPI) power released
| style="background: #E8E8E8" align="right" | 0xE0, 0xDF
| style="background: #E8E8E8" | (ACPI) sleep released
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xE3
| style="background: #E8E8E8" | (ACPI) wake released
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xE5
| style="background: #E8E8E8" | (multimedia) WWW search released
| align="right" | 0xE0, 0xE6
| (multimedia) WWW favorites released
| style="background: #E8E8E8" align="right" | 0xE0, 0xE7
| style="background: #E8E8E8" | (multimedia) WWW refresh released
|-
| align="right" | 0xE0, 0xE8
| (multimedia) WWW stop released
| style="background: #E8E8E8" align="right" | 0xE0, 0xE9
| style="background: #E8E8E8" | (multimedia) WWW forward released
| align="right" | 0xE0, 0xEA
| (multimedia) WWW back released
| style="background: #E8E8E8" align="right" | 0xE0, 0xEB
| style="background: #E8E8E8" | (multimedia) my computer released
|-
| align="right" | 0xE0, 0xEC
| (multimedia) email released
| style="background: #E8E8E8" align="right" | 0xE0, 0xED
| style="background: #E8E8E8" | (multimedia) media select released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
Line 856 ⟶ 1,064:
Note: There is no scan code for "pause key released" (it behaves as if it is released as soon as it's pressed)
=== Scan Code Set 2 ===
The following table shows which "make" scan codes correspond to which keys when using scan code set 2 (for a "US QWERTY" keyboard only):
Line 917 ⟶ 1,124:
| style="background: #E8E8E8" |
|-
| align="right" |
| left control pressed
| style="background: #E8E8E8" align="right" | 0x15
Line 1,018 ⟶ 1,225:
|
|
| style="background: #E8E8E8" align="right" | 0x41
| style="background: #E8E8E8" | , pressed
| align="right" | 0x42
| K pressed
Line 1,031 ⟶ 1,238:
| align="right" | 0x46
| 9 pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0x49
| style="background: #E8E8E8" | . pressed
| align="right" | 0x4A
| / pressed
| style="background: #E8E8E8" align="right" | 0x4B
| style="background: #E8E8E8" | L pressed
|-
| align="right" | 0x4C
| ; pressed
| style="background: #E8E8E8" align="right" | 0x4D
| style="background: #E8E8E8" | P pressed
| align="right" | 0x4E
| - pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0x52
| ' pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
Line 1,058 ⟶ 1,283:
| align="right" | 0x5A
| enter pressed
| style="background: #E8E8E8" align="right" | 0x5B
| style="background: #E8E8E8" | ] pressed
|-
|
Line 1,065 ⟶ 1,290:
| style="background: #E8E8E8" align="right" | 0x5D
| style="background: #E8E8E8" | \ pressed
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
Line 1,081 ⟶ 1,315:
|
|
| style="background: #E8E8E8" align="right" | 0x69
| style="background: #E8E8E8" | (keypad) 1 pressed
|
|
| style="background: #E8E8E8" align="right" | 0x6B
| style="background: #E8E8E8" | (keypad) 4 pressed
|-
| align="right" | 0x6C
| (keypad) 7 pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0x70
| (keypad) 0 pressed
| style="background: #E8E8E8" align="right" | 0x71
| style="background: #E8E8E8" | (keypad) . pressed
| align="right" | 0x72
| (keypad) 2 pressed
| style="background: #E8E8E8" align="right" | 0x73
| style="background: #E8E8E8" | (keypad) 5 pressed
|-
| align="right" | 0x74
| (keypad) 6 pressed
| style="background: #E8E8E8" align="right" | 0x75
| style="background: #E8E8E8" | (keypad) 8 pressed
| align="right" | 0x76
| escape pressed
Line 1,090 ⟶ 1,351:
| align="right" | 0x78
| F11 pressed
| style="background: #E8E8E8" align="right" | 0x79
| style="background: #E8E8E8" | (keypad) + pressed
| align="right" | 0x7A
| (keypad) 3 pressed
| style="background: #E8E8E8" align="right" | 0x7B
| style="background: #E8E8E8" | (keypad) - pressed
|-
| align="right" | 0x7C
| (keypad) * pressed
| style="background: #E8E8E8" align="right" | 0x7D
| style="background: #E8E8E8" | (keypad) 9 pressed
| align="right" | 0x7E
| ScrollLock pressed
Line 1,115 ⟶ 1,376:
| style="background: #E8E8E8" | F7 pressed
|-
| align="right" | 0xE0, 0x10
| (multimedia) WWW search pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x11
| style="background: #E8E8E8" | right alt pressed
Line 1,126 ⟶ 1,387:
| align="right" | 0xE0, 0x14
| right control pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x15
| style="background: #E8E8E8" | (multimedia) previous track pressed
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x18
| (multimedia) WWW favourites pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
Line 1,141 ⟶ 1,411:
| style="background: #E8E8E8" align="right" | 0xE0, 0x1F
| style="background: #E8E8E8" | left GUI pressed
|-
| align="right" | 0xE0, 0x20
| (multimedia) WWW refresh pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x21
| style="background: #E8E8E8" | (multimedia) volume down pressed
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x23
| style="background: #E8E8E8" | (multimedia) mute pressed
|-
|
Line 1,150 ⟶ 1,429:
| style="background: #E8E8E8" align="right" | 0xE0, 0x27
| style="background: #E8E8E8" | right GUI pressed
|-
| align="right" | 0xE0, 0x28
| (multimedia) WWW stop pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x2B
| style="background: #E8E8E8" | (multimedia) calculator pressed
|-
|
Line 1,159 ⟶ 1,447:
| style="background: #E8E8E8" align="right" | 0xE0, 0x2F
| style="background: #E8E8E8" | apps pressed
|-
| align="right" | 0xE0, 0x30
| (multimedia) WWW forward pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x32
| (multimedia) volume up pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x34
| (multimedia) play/pause pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x37
| style="background: #E8E8E8" | (ACPI) power pressed
|-
| align="right" | 0xE0, 0x38
| (multimedia) WWW back pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x3A
| (multimedia) WWW home pressed
| style="background: #E8E8E8" align="right" | 0xE0, 0x3B
| style="background: #E8E8E8" | (multimedia) stop pressed
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x3F
| style="background: #E8E8E8" | (ACPI) sleep pressed
|-
| align="right" | 0xE0, 0x40
| (multimedia) my computer pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x48
| (multimedia) email pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x4A
| (keypad) / pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0x4D
| style="background: #E8E8E8" | (multimedia) next track pressed
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0x50
| (multimedia) media select pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x5A
| (keypad) enter pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0x5E
| (ACPI) wake pressed
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
Line 1,213 ⟶ 1,591:
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x01
| style="background: #E8E8E8" | F9 released
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x03
| style="background: #E8E8E8" | F5 released
|-
| align="right" | 0xF0, 0x04
| F3 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x05
| style="background: #E8E8E8" | F1 released
| align="right" | 0xF0, 0x06
| F2 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x07
| style="background: #E8E8E8" | F12 released
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x09
| style="background: #E8E8E8" | F10 released
| align="right" | 0xF0, 0x0A
| F8 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x0B
| style="background: #E8E8E8" | F6 released
|-
| align="right" | 0xF0, 0x0C
| F4 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x0D
| style="background: #E8E8E8" | tab released
| align="right" | 0xF0, 0x0E
| ` (back tick) released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x11
| style="background: #E8E8E8" | left alt released
| align="right" | 0xF0, 0x12
| left shift released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xF0, 0x14
| left control released
| style="background: #E8E8E8" align="right" | 0xF0, 0x15
| style="background: #E8E8E8" | Q released
| align="right" | 0xF0, 0x16
| 1 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xF0, 0x1A
| Z released
| style="background: #E8E8E8" align="right" | 0xF0, 0x1B
| style="background: #E8E8E8" | S released
|-
| align="right" | 0xF0, 0x1C
| A released
| style="background: #E8E8E8" align="right" | 0xF0, 0x1D
| style="background: #E8E8E8" | W released
| align="right" | 0xF0, 0x1E
| 2 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x21
| style="background: #E8E8E8" | C released
| align="right" | 0xF0, 0x22
| X released
| style="background: #E8E8E8" align="right" | 0xF0, 0x23
| style="background: #E8E8E8" | D released
|-
| align="right" | 0xF0, 0x24
| E released
| style="background: #E8E8E8" align="right" | 0xF0, 0x25
| style="background: #E8E8E8" | 4 released
| align="right" | 0xF0, 0x26
| 3 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x29
| style="background: #E8E8E8" | space released
| align="right" | 0xF0, 0x2A
| V released
| style="background: #E8E8E8" align="right" | 0xF0, 0x2B
| style="background: #E8E8E8" | F released
|-
| align="right" | 0xF0, 0x2C
| T released
| style="background: #E8E8E8" align="right" | 0xF0, 0x2D
| style="background: #E8E8E8" | R released
| align="right" | 0xF0, 0x2E
| 5 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x31
| style="background: #E8E8E8" | N released
| align="right" | 0xF0, 0x32
| B released
| style="background: #E8E8E8" align="right" | 0xF0, 0x33
| style="background: #E8E8E8" | H released
|-
| align="right" | 0xF0, 0x34
| G released
| style="background: #E8E8E8" align="right" | 0xF0, 0x35
| style="background: #E8E8E8" | Y released
| align="right" | 0xF0, 0x36
| 6 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xF0, 0x3A
| M released
| style="background: #E8E8E8" align="right" | 0xF0, 0x3B
| style="background: #E8E8E8" | J released
|-
| align="right" | 0xF0, 0x3C
| U released
| style="background: #E8E8E8" align="right" | 0xF0, 0x3D
| style="background: #E8E8E8" | 7 released
| align="right" | 0xF0, 0x3E
| 8 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x41
| style="background: #E8E8E8" | , released
| align="right" | 0xF0, 0x42
| K released
| style="background: #E8E8E8" align="right" | 0xF0, 0x43
| style="background: #E8E8E8" | I released
|-
| align="right" | 0xF0, 0x44
| O released
| style="background: #E8E8E8" align="right" | 0xF0, 0x45
| style="background: #E8E8E8" | 0 (zero) released
| align="right" | 0xF0, 0x46
| 9 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x49
| style="background: #E8E8E8" | . released
| align="right" | 0xF0, 0x4A
| / released
| style="background: #E8E8E8" align="right" | 0xF0, 0x4B
| style="background: #E8E8E8" | L released
|-
| align="right" | 0xF0, 0x4C
| ; released
| style="background: #E8E8E8" align="right" | 0xF0, 0x4D
| style="background: #E8E8E8" | P released
| align="right" | 0xF0, 0x4E
| - released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xF0, 0x52
| ' released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xF0, 0x54
| [ released
| style="background: #E8E8E8" align="right" | 0xF0, 0x55
| style="background: #E8E8E8" | = released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xF0, 0x58
| CapsLock released
| style="background: #E8E8E8" align="right" | 0xF0, 0x59
| style="background: #E8E8E8" | right shift released
| align="right" | 0xF0, 0x5A
| enter released
| style="background: #E8E8E8" align="right" | 0xF0, 0x5B
| style="background: #E8E8E8" | ] released
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x5D
| style="background: #E8E8E8" | \ released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xF0, 0x66
| backspace released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x69
| style="background: #E8E8E8" | (keypad) 1 released
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x6B
| style="background: #E8E8E8" | (keypad) 4 released
|-
| align="right" | 0xF0, 0x6C
| (keypad) 7 released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xF0, 0x70
| (keypad) 0 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x71
| style="background: #E8E8E8" | (keypad) . released
| align="right" | 0xF0, 0x72
| (keypad) 2 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x73
| style="background: #E8E8E8" | (keypad) 5 released
|-
| align="right" | 0xF0, 0x74
| (keypad) 6 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x75
| style="background: #E8E8E8" | (keypad) 8 released
| align="right" | 0xF0, 0x76
| escape released
| style="background: #E8E8E8" align="right" | 0xF0, 0x77
| style="background: #E8E8E8" | NumberLock released
|-
| align="right" | 0xF0, 0x78
| F11 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x79
| style="background: #E8E8E8" | (keypad) + released
| align="right" | 0xF0, 0x7A
| (keypad) 3 released
| style="background: #E8E8E8" align="right" | 0xF0, 0x7B
| style="background: #E8E8E8" | (keypad) - released
|-
| align="right" | 0xF0, 0x7C
| (keypad) * released
| style="background: #E8E8E8" align="right" | 0xF0, 0x7D
| style="background: #E8E8E8" | (keypad) 9 released
| align="right" | 0xF0, 0x7E
| ScrollLock released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xF0, 0x83
| style="background: #E8E8E8" | F7 released
|-
| align="right" | 0xE0, 0x12, 0xE0, 0x7C
Line 1,220 ⟶ 1,895:
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x10
| (multimedia) WWW search released
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x11
| style="background: #E8E8E8" | right alt released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x14
| right control released
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x15
| style="background: #E8E8E8" | (multimedia) previous track released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x18
| (multimedia) WWW favourites released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x1F
| style="background: #E8E8E8" | left GUI released
|-
| align="right" | 0xE0, 0xF0, 0x20
| (multimedia) WWW refresh released
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x21
| style="background: #E8E8E8" | (multimedia) volume down released
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x23
| style="background: #E8E8E8" | (multimedia) mute released
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x27
| style="background: #E8E8E8" | right GUI released
|-
| align="right" | 0xE0, 0xF0, 0x28
| (multimedia) WWW stop released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x2B
| style="background: #E8E8E8" | (multimedia) calculator released
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x2F
| style="background: #E8E8E8" | apps released
|-
| align="right" | 0xE0, 0xF0, 0x30
| (multimedia) WWW forward released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x32
| (multimedia) volume up released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x34
| (multimedia) play/pause released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x37
| style="background: #E8E8E8" | (ACPI) power released
|-
| align="right" | 0xE0, 0xF0, 0x38
| (multimedia) WWW back released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x3A
| (multimedia) WWW home released
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x3B
| style="background: #E8E8E8" | (multimedia) stop released
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x3F
| style="background: #E8E8E8" | (ACPI) sleep released
|-
| align="right" | 0xE0, 0xF0, 0x40
| (multimedia) my computer released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x48
| (multimedia) email released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x4A
| (keypad) / released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x4D
| style="background: #E8E8E8" | (multimedia) next track released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x50
| (multimedia) media select released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x5A
| (keypad) enter released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x5E
| (ACPI) wake released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x69
| style="background: #E8E8E8" | end released
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x6B
| style="background: #E8E8E8" | cursor left released
|-
| align="right" | 0xE0, 0xF0, 0x6C
| home released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x70
| insert released
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x71
| style="background: #E8E8E8" | delete released
| align="right" | 0xE0, 0xF0, 0x72
| cursor down released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
| align="right" | 0xE0, 0xF0, 0x74
| cursor right released
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x75
| style="background: #E8E8E8" | cursor up released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x7A
| page down released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" align="right" | 0xE0, 0xF0, 0x7D
| style="background: #E8E8E8" | page up released
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
|-
|
|
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
| align="right" | 0xE0, 0xF0, 0x7C, 0xE0, 0xF0, 0x12
| print screen released
| style="background: #E8E8E8" |
| style="background: #E8E8E8" |
Line 1,235 ⟶ 2,135:
Note: There is no scan code for "pause key released" (it behaves as if it is released as soon as it's pressed)
=== Scan Code Set 3 ===
The following table shows which scan codes correspond to which keys when using scan code set 3 (for a "US QWERTY" keyboard only):
{| {{wikitable}}
|-
!Key
!Code for Scan code set 3
|-
|A || 1C
|-
|B || 32
|-
|C || 21
|-
|D || 23
|-
|E || 24
|-
|F || 2B
|-
|G || 34
|-
|H || 33
|-
|I || 43
|-
|J || 3B
|-
|K || 42
|-
|L || 4B
|-
|M || 3A
|-
|N || 31
|-
|O || 44
|-
|P || 4D
|-
|Q || 15
|-
|R || 2D
|-
|S || 1B
|-
|T || 2C
|-
|U || 3C
|-
|V || 2A
|-
|W || 1D
|-
|X || 22
|-
|Y || 35
|-
|Z || 1A
|}
[https://web.archive.org/web/20170108131104/http://www.computer-engineering.org/ps2keyboard/scancodes3.html Scan code]
==See Also==
Line 1,248 ⟶ 2,204:
*[[PL050 PS/2 Controller | PL050 PS/2 Controller (ARM)]]
*[[PS/2 Mouse]]
===Forum Threads===
*[[Topic:9746|Keyboard input]]
*[[Topic:9761|Up or down press?]]
Line 1,255 ⟶ 2,211:
*[[Topic:9448|Discussion about keyboard input in a GUI]]
*[[Topic:9590|Scroll-lock LED]]
*[[Topic:10153|Keyboard LEDs (
*[[Topic:10053|Keyboard LEDs (
===External Links===
*[http://www.win.tue.nl/~aeb/linux/kbd/scancodes.html Keyboard scancodes] - A complete reference on all scancodes you might encounter.
*[https://web.archive.org/web/20030621203107/http://www.microsoft.com/whdc/hwdev/tech/input/Scancode.mspx USB HID to PS/2 Translation Table] - Microsoft's table of scancodes and USB equivalents
*[https://web.archive.org/web/20190301075756/http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc Keyboard Scan Code Specification] - Microsoft's specification for scancodes
*[https://www.youtube.com/playlist?list=PLUZozxlhse-NUto5JeJ0EDXEUFloWBdAj PS/2 keyboard interface playlist] - A video playlist of building a PS/2 keyboard interface on bread boards, by Ben Eater.
==== Implementations ====
* [http://lxr.linux.no/#linux+v3.5.4/drivers/input/keyboard/atkbd.c Linux] (C,GPL)
* [https://github.com/Stichting-MINIX-Research-Foundation/minix/blob/master/minix/drivers/hid/pckbd/pckbd.c Minix]
[[Category:Human Interface Device]]
[[Category:Common Devices]]
| |||