Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!cernvax!cui!ugun2b!ugsc2a!fisher
From: fisher@sc2a.unige.ch (Markus Fischer)
Newsgroups: comp.sys.ibm.pc
Subject: Re: NUMLOCK
Message-ID: <138@sc2a.unige.ch>
Date: 14 Nov 89 08:50:53 GMT
References: <523@darth.PGH.PA.US>
Organization: University of Geneva, Switzerland
Lines: 37

In article <523@darth.PGH.PA.US>, liber@darth.PGH.PA.US (Eric Liber) writes:
> The numlock, scroll lock and caps lock lights and system status are recorded
> and set by the byte at 0040:0017 the bits of the byte have the following 
> meaning:
> 
> 	bit 0 - if set (=1) then the keyboard is in a permanent shifted state
>  	bit 1 - ?
> 	bit 2 - ?
> 	bit 3 - ?
> 	bit 4 - scroll lock  - 0 = off  1 = on
> 	bit 5 - num lock  -    0 = off  1 = on
> 	bit 6 - caps lock -    0 = off  1 = onn

Well, actually it's a word...
	bit  0 - right shift
	bit  1 - left shift
	bit  2 - Control state
	bit  3 - Alt state
	bit  4 - Scroll Lock state
	bit  5 - Num Lock state
	bit  6 - Caps Lock state
	bit  7 - Insert state

	bit  8 - (left) control *key* down
	bit  9 - Alt key down
	bit 10 - ??
	bit 11 - ??
	bit 12 - Scroll Lock key down
	bit 13 - Num Lock key down
	bit 14 - Caps Lock key down
	bit 15 - Insert key down...
> 
> Eric (the red baron) Liber

Still, two question marks left...  And how does one detect the `AltGr' state ???

Markus Fischer