liber@darth.PGH.PA.US (Eric Liber) (11/12/89)
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 the only rational way to make the machine boot with numlock off is to create a small program that you can include in your autoexec.bat to reset bit 5 of the byte. These can also be helpful if you need to assure the setting of one of these in an application program. good luck Eric (the red baron) Liber
toma@tekgvs.LABS.TEK.COM (Tom Almy) (11/13/89)
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 No (from IBM PC/AT Technical Reference Manual), bit 0 - right shift key depressed > bit 1 - ? bit 1 - left shift key depressed > bit 2 - ? bit 2 - control key depressed > bit 3 - ? bit 3 - alt key depressed > bit 4 - scroll lock - 0 = off 1 = on > bit 5 - num lock - 0 = off 1 = on > bit 6 - caps lock - 0 = off 1 = onn bit 7 - Insert state active (toggles with Insert key??) Tom Almy toma@tekgvs.labs.tek.com Standard Disclaimers Apply
fisher@sc2a.unige.ch (Markus Fischer) (11/14/89)
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