Messages in this thread |  | | Date | Sun, 18 Feb 2007 09:54:27 -0800 | From | Randy Dunlap <> | Subject | Re: Linus' laptop and Num lock status |
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On Sun, 18 Feb 2007 17:04:01 +0100 Jean Delvare wrote:
> On Thu, 15 Feb 2007 06:34:35 -0800, H. Peter Anvin wrote: > > Jean Delvare wrote: > > > On x86, the BIOS led state can be read from byte 0x97 the BIOS RAM. The > > > BIOS RAM is mapped at 0x400 so all we need to do is to one byte from > > > RAM (offset 0x497). This is how Suse's hwinfo does. > > > > Perhaps that's what Suse does, but the proper address is 0x417. > > > > 0x497 is the rarely-used LPT2 timeout counter. > > Still, the information printed by hwinfo is correct, I've tested it > myself. Is there some publicly available documentation about the x86 > BIOS RAM mapping?
Hilo,
0x40:0x17 is called "keyboard control" and 0x40:0x97 is called "keyboard LED flags" in the IBM Personal System/2 and Personal Computer BIOS Interface Technical Reference, Section 3: Data Areas and ROM Tables.
<internet_search> /bios data areas tables/ ::
http://heim.ifi.uio.no/~stanisls/helppc/bios_data_area.html http://heim.ifi.uio.no/~stanisls/helppc/kb_flags.html
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