Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!iuvax!bkliewer
From: bkliewer@iuvax.cs.indiana.edu (Bradley Dyck Kliewer)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Kbd. LED Indicator Lights?
Keywords: Access, How?
Message-ID: <15711@iuvax.cs.indiana.edu>
Date: 9 Dec 88 20:18:54 GMT
References: <80810@sun.uucp>
Reply-To: bkliewer@iuvax.UUCP (Bradley Dyck Kliewer)
Organization: Indiana University CSCI, Bloomington
Lines: 14

In article <80810@sun.uucp> jborza%burgundy@Sun.COM (Jim_Borza) writes:
>I'm pretty certain the XT keyboard's LEDs are inaccessible except
>to the controller in the Kbd. but is it possible to simply reset
>them to an OFF state?  Thanks for any help.  BTW, C or MASM source
>(or just helpful hints) will do.

On IBM machines, the LED's toggle when the status bit in the BIOS data
area changes.  I'm not sure of the exact address, but it's somewhere in
segment 40h.  As for non-IBM machines and add-on keyboards, I don't think
there are any standards.

Bradley Dyck Kliewer                Hacking...
bkliewer@iuvax.cs.indiana.edu       It's not just an adventure
                                    It's my job!