keymap man page on Minix

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KEYMAP(5)							     KEYMAP(5)

NAME
       keymap - keyboard maps

SYNOPSIS
       /etc/keymap

DESCRIPTION
       /etc/keymap  is	the  compressed	 mapping  from	keyboard scan codes to
       ASCII.  It is made from a keymap source	file  consisting  of  MAP_COLS
       columns	(MINIX	assigns	 the value 6 to MAX_COLS, corresponding to key
       pressed,	 key+SHIFT,  key+LEFT_ALT,  key+RIGHT_ALT,  key+ALT+SHIFT  and
       key+CTRL)  and  NR_SCAN_CODES  rows  (MINIX  assigns  the value 0x80 to
       NR_SCAN_CODES, corresponding to the number of scan codes to be provided
       by  the	keyboard), and each element is 2 bytes in length (see u16_t in
       type definitions).  The low order byte  corresponds  to	the  character
       represented  by	the  scan code, and the high order byte corresponds to
       the special meaning (when CAPS LOCK has effect, if  it  is  a  function
       key, etc.), which is converted to binary keymap format using the genmap
       utility.

   Types (general): <sys/types.h>
       <sys/types.h> defines the u8_t and u16_t types, corresponding to 8  and
       16 bit values.

   Macros: <minix/keymap.h>
       C(c) - Control
	      Maps to control code

       A(c) - Alt
	      Sets the eight bit

       CA(c) - Control-Alt
	      Short for A(C(c))

       L(c) - Caps Lock
	      Adds Caps Lock effect

       These  macros are used in a keymap source file to help define keys.  So
       instead of writing 032 to put a CTRL-Z in the  map  you	write  C('Z').
       The  L(c)  macro	 is used in column 0 to tell that the Caps Lock key is
       active for this key.  (Caps Lock should only have effect on letters.)

   Definitions: <minix/keymap.h>
       <minix/keymap.h> contains a large number	 of  definitions  for  special
       keys, like function keys, and keys on the numeric keypad.  They are:

       Escape key and modifiers: EXT, CTRL, SHIFT, ALT.

       Numeric	keypad keys: HOME, END, UP, DOWN, LEFT, RIGHT, PGUP, PGDN, MID
       (numeric '5'), PLUS, INSRT.

       ALT + numpad key: AHOME, AEND, ..., AINSRT.

       CTRL + numpad: CHOME, CEND, ..., CINSRT.

       Lock keys: CALOCK (Caps Lock), NLOCK (Num Lock), SLOCK (Scroll Lock).

       Function keys: F1, ..., F12.

       ALT - function key: AF1, ..., AF12.

       CTRL - function key: CF1, ..., CF12.

       SHIFT - function key: SF1, ..., SF12.

       ALT - SHIFT - function key: ASF1, ..., ASF12.

       There is one key definition that isn't a key at all: EXTKEY.  This key‐
       code  is	 sent by the keyboard as an indicator that the next keycode is
       special.	 For instance both ALT keys have the  same  keycode,  but  the
       right  ALT  key is sent by the keyboard preceded by the EXTKEY keycode.
       The same is true for the '/' key on the numeric pad  versus  the	 other
       '/'  key	 on  the US keyboard.  (On other keyboards this key may have a
       different symbol.)  The keyboard driver knows that a different  key  is
       presses if it is preceded by EXTKEY.

   Creating/changing keyboard mapping
       You can create your own keyboard mapping by copying one of the existing
       keymap source files  (Standard  Minix:  drivers/tty/keymaps/*.src)  and
       modifying the desired keys. Once this has been done, you need to recom‐
       pile the genmap.c file, either by adding a new entry to	the  Makefile,
       or by running the following commands:

	      cc -DKEYSRC=\"keymap.src\" genmap.c

       After this, the keymap file can be generated by running:

	      a.out > keymap.map

       The keymap can be loaded in the keyboard driver by:

	      loadkeys keymap.map

       It is wise to first run loadkeys on one of the maps in /usr/lib/keymaps
       so that you can easily revert back to a known keymap with a few taps on
       the  up-arrow  key and pressing return.	You will otherwise have to fix
       the keymap with a faulty keymap loaded into the keyboard driver,	 which
       is no fun.

       When  the keymap is to your satisfaction you can copy it to /etc/keymap
       to have it loaded automatically at reboot.

FILES
       /etc/keymap    Default keymap file

SEE ALSO
       loadkeys (1).

AUTHOR
       Victor A. Rodriguez - El bit Fantasma (Bit-Man@Tasa.Com.AR)

								     KEYMAP(5)
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