Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!BROWNVM.BROWN.EDU!DANFUZZ
From: DANFUZZ@BROWNVM.BROWN.EDU (Dan Bornstein)
Newsgroups: comp.sys.apple
Subject: Re: cassette click
Message-ID: <8910251156.aa16257@SMOKE.BRL.MIL>
Date: 25 Oct 89 15:45:38 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 49


>Re: cassette click
>From:         Jawaid Bazyar
>              <brutus.cs.uiuc.edu!wuarchive!uwm.edu!ux1.cso.uiuc.edu!uxa.cso
>              .uiuc.edu!jb10320@APPLE.COM>
>
>In article <2390@eagle.wesleyan.edu> dkonerding@eagle.wesleyan.edu writes:
>>... One thing I'm doing to trying to get a check the cassette in
>>byte and see if there's sound coming in,and if so, click the speaker-- in
>>effect, making the Apple speaker sound like whatever my tape is playing.  I
>>know that people have taped their voices and played them back with the Apple,
>   As far as I remember, only one bit in the C060 (or whatever) cassette-in
>port is actually functional. I assume this is the high bit (7 or 8 for those
>of you who prefer).  What you really need to check for is something like this:
>LDA C060
>BPL TOP
>BIT C030
>BRA TOP
>
>   In addition, you might need to put some sort of delay in this loop,
>as this loop executes at around 100,000 times per second, far faster than
>the resolution of the speaker and sound hardware on the //e.

Not quite; The way the cassette port works is *not* to toggle hi/low for
each click but rather to just do one change (low to high or vice versa),
so the program should look like this (no extra delay necessary):

300: BIT C060
303: BPL 300
305: BIT C030
308: BIT C060
30B: BPL 308
30D: BIT C030
30F: JMP 300

This should click whenever the state of the cassette port changes.
If you're interested in actual digitizing, I wrote a program a while
ago (when I still had an Apple ][ (not ][+,e,etc.) called "Reel To Reel".
If you can't find it locally, mail me and I'll try to get it packed and
upload it (the last time I uploaded from an Apple was pre-shrinkit, so
I may have to get that first; it may take me a while, seeing as I'm in
the midst of midterms.) Mail me if you're interested.


-dan

Bitnet:    danfuzz@brownvm
Internet:  danfuzz@brownvm.brown.edu
AppleTalk: Find me a long enough cable and I'll see what we can do.