From: kalle <kalle@projektwerkstatt.de> To: kbd@lists.altlinux.org Subject: [kbd] man keymaps Date: Sun, 23 Jul 2017 07:51:38 +0200 Message-ID: <0b2c4b49-1f28-d87a-205b-0c5c07b79e9c@projektwerkstatt.de> (raw) hello, I have some improvement proposals or unclear points (where explanation could be improved) for the man 5 keymaps page. *It would make sense to explain the term 'charset' somewhere what for is the code produced by a keysym ? How is it related to character encoding? *it would make sense to explain basic terms at the beginning of the page, e.g. charset, keysym, key(scan-)code *keysym: what does the term stand for? why 'symbol'? what does 'keyboard actions' mean? is keyboard induced action possibly better? how is this set of actions related to the specific kernel (driver?)? *'outputting character codes' -> explain more precisely what is meant here by 'character codes' *first the term 'keysyms' should be explained in detail, before explaining special keysyms as modifiers are, e.g. the section "keysyms can be given in decimal, octal" should be before the modifier part *the modifier-part is in my opinion badly explained - I roughly propose the following: to every key there are 2^8=256 (?) possibilities/modes of outputting symbols (defined by the kernel driver?) The 2^8 modes can be represented by eight binary digits, or interpreted as a binary number with 8 (?) digits, e.g. 010000101. The first digit standing , the last one for units of 2^0=1, in this example 0*2^7+0*2^6+0*2^5+0*2^4+0*2^3+1*2^2+0*2^1+1*2^0=133. The different digits are called modifiers, since by combination of all their different states (0 or 1) they are able to produce 256 (?) modes, where the default one is when all modifiers are off (=0) so 00000000 binary is also 0 decimal number. These modifiers are keysyms thus their state can be changed by typing some keys and out of historical development have been given following names: modifier name power of 2 decimal value Shift 0 1 AltGr Alternate Graph 1 2 ics Control 2 4 Alt 3 8 ShiftL left Shift key 4 16 ShiftR right Shift key 5 32 CtrlL left Control key6 64 CtrlR right Control k.7 128 CapsShift 8 256 *I don't understand the example of the part starting with "Note that you should be very careful[…]",because it tells that the Control modifier stays switched on, until it is produced again by typing in the same key. *To the sentence "these are actually being defined" add "by the map specification line, see above" *to "it has a special meaning" add: "to loadkeys (1)"? greetings, kalle
next reply other threads:[~2017-07-23 5:51 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-07-23 5:51 kalle [this message] 2017-08-06 12:28 ` Alexey Gladkov 2017-08-06 16:20 ` kalle 2017-08-11 12:04 ` Oleg Bulatov
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