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Reply-To: "Geraldo Sazias"
From: "Geraldo Sazias"
References: <9qXl9.20647$PO2.firstname.lastname@example.org> <email@example.com> <3D990DAD.75722C6D@webaccess.net>
Subject: Re: Controlling A CD-ROM Mechanism Through The IDE Interface
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Tue, 01 Oct 2002 13:56:58 GMT
NNTP-Posting-Date: Tue, 01 Oct 2002 15:56:58 MEST
"Chuck Simmons" wrote in message
> The little lost angel wrote:
> > On Mon, 30 Sep 2002 12:26:45 GMT, "Geraldo Sazias"
> > wrote:
> > >I recently asked a question about how to connect a MCU to an IDE
> > >connected to a CD-ROM drive as I want to build my own CD-player. I even
> > Erm, why a MCU? Most CD-ROM would work as a cd player right out of the
> > box if you power them. Those with more buttons would be easier operate
> > of course.
> Actually, it is a reasonable question but players are so cheap that you
> might as well buy one. Heck, the price of DVD players is in the noise
> level ($60 US new and refurbs for less than $50) and they mostly play
> CDs. The group I am in is doing currently what the OP wants to do but we
> have an ATA bus analyzer so we capture what a player with an IDE does
> and do a major "monkey see, monkey do." We did DVD first because
> customers wanted to see a movie. We were unable to get the "Keystone
> Cops" on DVD and settled for "Police Academy" as fitting.
> His schematic showed only half of the ATA data lines connected. Is it
> possible to do ATAPI with only 8 bits of the ATA? I don't know. We use
> all 16 data lines. The ATAPI commands for just playing the music are
> simpler than for DVD playing a movie. Still, there is quite a bit of
> initial bus traffic (some of that has to do with deciding whether we are
> a DVD or a CD - I think the guys just canned the responses to get by
I'm not too sure about it myself so I added some extra latches.
> I think the OP needs to look at CD play software to see how it is done.
> There are open source players for Linux he can look at. He might have to
> look at the driver software as well to see how the ATAPI traffic is
> handled. And I still wonder about using the lower 8 bits only for ATAPI.
Thanks for the tips.I'm not sure myself about using 8-bits but I read
somewhere that, even though the ATAPI standard does support 8-bit transfers,
no harddisks support this mode anymore, so I'm guessing that the same will
hold for CD-ROM drives. Anyway, I'm gonna play safe and use 16-bits.
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