Re: How to turn off battery low power beep in ASM??
- From: spamtrap@xxxxxxxxxx (Gerard Bok)
- Date: Mon, 24 Oct 2005 17:34:08 +0000 (UTC)
On Mon, 24 Oct 2005 08:00:35 +0000 (UTC), mike
<spamtrap@xxxxxxxxxx> wrote:
>I have a Fujitsu Lifebook B112 with a weak battery.
>I get the low battery warning almost immediately, but
>it runs fine for another two hours.
>Problem is the annoying low battery beep.
>It's coming from the bios, cause it beeps in BIOS
>setup long before the OS gets loaded. Comes out the main
>speaker, so can't listen to mp3 without the beep.
>Seems to be no place in the bios setup to turn it off.
>
>What are my options?
Call Fujitsu Siemens ?
>It's been a long time since I did any ASM programming, but
>IRRC, the beep is a bios call vectored thru a jump vector
>in low memory.
Yes. And then the OS boots, puts the CPU into protected mode and
ignores BIOS altogether from there :-)
If your beep starts before the OS is loaded and continues while
your OS plays an MP3, chances are that it is a hardware feature.
(Low bat warning being injected into the speaker driver's
hardware.)
>Shouldn't I be able to put a small program
>in autoexec.bat that pokes that jump vector to point to a RTI instruction?
Easy to test, I guess. Even without programming :-)
There are plenty small programs around that just produce a
continuous beep into the speaker.
Find one with another tone than your low-bat warning and start it
in autoexec.
If you only hear the 'new' tone, your idea will probably
function.
If you hear a mixed tone, it indicates a hardware feature, as
described above.
--
Kind regards,
Gerard Bok
.
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