How do I ring a bell?
frank2 at fjl.co.uk
Mon Oct 7 12:46:54 UTC 2013
On 07/10/2013 13:06, Peter Boosten wrote:
> On 7 okt. 2013, at 13:37, Frank Leonhardt <frank2 at fjl.co.uk
> <mailto:frank2 at fjl.co.uk>> wrote:
>> In the good'ol days I could make UNIX ring a bell (literally) by
>> sending \a to the console TTY (an ASR33 in my case). Now there's an
>> electronic synthesised ting or beep from an terminal emulator IF it's
>> got a sound card and so on, and an IBM-PC had a beep routine in the BIOS.
>> Is there any way to make a noise through the built in "bell" speaker
>> found on an IBM PC compatible server box? Writing 007 to the BIOS
>> cout routine might do it, but I've realised I haven't got a clue how
>> to do that.
>> I could easily knock up a bit of hardware to go on a serial port (or
>> similar) that could be triggered to make a noise, but these things
>> have already got the hardware built in and I'm looking to use what
>> I've already got.
>> Thanks, Frank.
>> P.S. "cdcontrol -f /dev/mycdrom eject" is the best I've come up with
>> so far for getting attention.
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> echo "CTRL-V CTRL-G" should do the trick
Alas, not. The console driver won't ring the BIOS bell on anything I've
tried. It might on a desktop with a built-in sound card and speakers,
but it won't do anything with the "beep" speaker. It's actually the same
solution I mentioned in the first line (\a translates to 007 which is
Then there's the issue of writing it to the console rather than a
virtual terminal, but I have a few hacks that'll achieve that part.
IIRC there was once a FreeBSD kernel module to drive the PC speaker
(through /dev/pcspeaker or similar), but it seems to have gone or I'm
confusing it with another BSD (or Linux).
No I'm not. /usr/src/sys/dev/speaker/spkr.c(!) I may be close to a
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