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KEYBOARD(4) | Device Drivers Manual | KEYBOARD(4) |
NAME¶
keyboard
—
pc keyboard interface
DESCRIPTION¶
The PC keyboard is used as the console character input device. The keyboard is owned by the current virtual console. To switch between the virtual consoles use the sequence ALT+Fn, which means hold down ALT and press one of the function keys. The virtual console with the same number as the function key is then selected as the current virtual console and given exclusive use of the keyboard and display. The console allows entering values that are not physically present on the keyboard via a special keysequence. To use this facility press and hold down ALT, then enter a decimal number from 0-255 via the numerical keypad, then release ALT. The entered value is then used as the ASCII value for one character. This way it is possible to enter any ASCII value, not present on the keyboard. The console driver also includes a history function. It is activated by pressing the scroll-lock key. This holds the display, and enables the cursor arrows for scrolling up and down through the last scrolled out lines. The keyboard is configurable to suit the individual user and the different national layout. The keys on the keyboard can have any of the following functions:- Normal key
- Enter the ASCII value associated with the key.
- Function key
- Enter a string of ASCII values.
- Switch Key
- Switch virtual console.
- Modifier Key
- Change the meaning of another key.
struct keymap { u_short n_keys; struct key_t { u_char map[NUM_STATES]; u_char spcl; u_char flgs; } key[NUM_KEYS]; };
alt scan cntrl alt alt cntrl code base shift cntrl shift alt shift cntrl shift map[n] 0 1 2 3 4 5 6 7 ---- ------------------------------------------------------ 0x1E 'a' 'A' 0x01 0x01 'a' 'A' 0x01 0x01
struct fkeyarg { u_short keynum; char keydef[MAXFK]; char flen; };
F1-F12 key 1 - 12 Shift F1-F12 key 13 - 24 Ctrl F1-F12 key 25 - 36 Ctrl+shift F1-F12 key 37 - 48 Home key 49 Up arrow key 50 Page Up key 51 (keypad) - key 52 Left arrow key 53 (keypad) 5 key 54 Right arrow key 55 (keypad) + key 56 End key 57 Down arrow key 58 Page down key 59 Insert key 60 Delete key 61 Left window key 62 Right window key 63 Menu key 64
AUTHORS¶
Søren Schmidt ⟨sos@FreeBSD.org⟩January 8, 1995 | Debian |