Maybe write a program to try different patterns of memory access
to try to figure out what causes what sounds.. (maybe write something
to play simple music on your memory chips?) this phenomenon, while 
not _very_ common, is way cool! 

happy hacking,
isildur

On 4 Dec 2002, melt wrote:

> On Wed, 2002-12-04 at 02:25, Lord Isildur wrote:
> > Ive had memories on other computers hum in audible frequencies during 
> > accesses sometimes, so its entirely possible (though generally rather
> > unlikely).. and if you can hear it over the fans in that box, wow! 
> > its much easier to hear if you listen to an AM radio next to it.. though 
> > a DEC box is usually pretty well shielded..
> > are you sure its not disk noise? as the heads move (and stay put when 
> > theyre not needed for a moment) the air striking the head assembly 
> > does so at different angles and usually the faint whistling/vibrating of 
> > this airflow changes pitch with different head positions.. 
> 
> I'm fairly sure it's not disk access because i've not got the disk cab
> powered up, it's a 4000/200 with DSSI so for the moment it's netbooting.
> It seems to do it when it's doing a large amount of writes to the NFS
> device (it's not the NFS server) during a ./configure although it's not
> the network device because it is silent under high network load...
> 
> Alex
> 
>