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From: dpawson@.com (Dave Pawson)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Limitations in recording and playback of digitized audio.
Keywords: audio processing bottlenecks
Message-ID: <1990Oct17.202613.16825@oracle.com>
Date: 17 Oct 90 20:26:13 GMT
References: <2332@wroach.cactus.org> <1990Oct13.165359.14653@chaos.cs.brandeis.edu>
Reply-To: dpawson@oracle.UUCP (Dave Pawson)
Organization: Oracle Corporation, Belmont, CA
Lines: 26

>. . .This is especially true with polled recording
>devices like the MacRecorder(tm) which chew up large amounts of CPU time to
>do their work. Notice that you can't even move the mouse when recording with
>the MacRecorder - disk access is far more disruptive. The Voice Link is
>interrupt driven, so it will eventually be able to record to disk.

>| Same as it ever was  | Dan Schwarz, MB 2926 Brandeis U. | RECYCLE YOUR JUNK|
>| Same as it ever was  | I'NET dan@chaos.cs.brandeis.edu  |------------------|
>| Same as it ever was  |----------------------------------| tradetapes?mailme|
>| Same as it ever was...TALKING HEADS "Once in a Lifetime"| FloydRushDeadEtc.|

I could be wrong, but I don't think this is why you cannot move the mouse.  I 
fooled around a few years ago with sound digitizing, and trying to write 
digitizing software.  It turns out that there is a bit in one of the VIA
registers that used to indicate if the mouse button had been pressed.  However,
with the advent of ADB, that bit then indicated any event on the ADB bus.  I
have found that a lot of old digitizing software will prompt you with something
like "Press the mouse button to stop recording", but will stop if you even move
the mouse.  Eventually, I became quite certain that this software probably
just monitors the bit in the VIA, and if it flags an event, they stop
recording.  They think they are waiting for a mouse click, but actually are
waiting for any ADB event.  Pressing a key on the keyboard stops it too.
Just a piece of random info to brighten your day. . .
      	       	     	      	       	  Dave Pawson
      	       	     	      	       	  dpawson@oracle.com
"Two wrongs don't make a right, but three rights make a left"