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From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: ASDG Fast ram chirps?!
Message-ID: <2254@cbmvax.UUCP>
Date: Tue, 25-Aug-87 12:11:32 EDT
Article-I.D.: cbmvax.2254
Posted: Tue Aug 25 12:11:32 1987
Date-Received: Wed, 26-Aug-87 07:22:23 EDT
References: <8708211723.AA10752@THYME.LCS.MIT.EDU>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 26

In article <8708211723.AA10752@THYME.LCS.MIT.EDU> atheybey@ptt.lcs.mit.edu writes:
> Originating-Client: flower
> 
> I just bought an ASDG 8M/2 board (8Mb board w/ 2 Mb installed), and a
> Mini-Rack C.  Sometimes, the board chirps (for lack of a better word)
> when it is accessed.  For example, when I hold down the "more" gadget
> in Facc, it chirps in time with the increasing number of buffers.
> When I run something out of VD0:, it chirps (slightly differently).
> The loudest noise I have heard is while the "executing out of fast
> ram" part of ASDG's memory test is running.  It sounds vaguely like a
> cricket in the distance.

The chirping is probably the power supply's reaction to a sudden change
in the load when the DRAM duty cycle goes from low to almost 100%.  This
can represent a pretty big jump in power consumption.  It's also possible
that there is some kind of contention which would cause even nastier
problems, but the ASDG folks are probably more clever than that.

Do both boards seem to chirp when used one-at-a-time?  If so, then I wouldn't
worry about it.  If one chirps and the other doesn't, then I'd give ASDG a
call and see what they say.

-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)