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.. 

isildur

On 3 Dec 2002, melt wrote:

> I've only just started to notice during long compiles - does anyone
> else's VAX whine/squeal during (what I assume to be) memory accesses?
> 
> I'm talking about a 4000/200 here.
> 
> *squeak* *squeak*
> alex
> 
> 
> 
>