I have a question to ask to this community; anyone have idea about the type
of interface needed to build to permit the use of older 2X or 4X CDROM
reader for play musical CDROM, without the PC??
First off, if it has built in PLAY/STOP buttons, you could probably
just control those directly.
If it's an IDE drive, then I'd imagine it should be fairly
straightforward. You just need to be able to read and write 16-bit
wide data to the drive, and there was a thread not so long ago
regarding connecting IDE devices to microcontrollers. If you're
using one of the smaller PICs, you could probably hack something
together using a 16-bit shift register, or a latch.
No need to worry about DMA or anything like that.
Check out the ATA and ATAPI specs - AFAIK the CD play, stop, pause
etc... commands are all accessible via ATAPI.
If, on the other (third!) hand, it's a SCSI drive, well... I haven't
got a clue!
Good luck, (and it's not such a crazy idea!)
Ben
> I have a question to ask to this community; anyone have idea about the type
> of interface needed to build to permit the use of older 2X or 4X CDROM
> reader for play musical CDROM, without the PC??
>
> It seems a crazy idea??
cacciavite@BIGFOOT.COM wrote:
>
> Ciao PIC'er friend,
>
> I have a question to ask to this community; anyone have idea about the type
> of interface needed to build to permit the use of older 2X or 4X CDROM
> reader for play musical CDROM, without the PC??
>
> It seems a crazy idea??
>
> Grazie for your suggestion.
>
> Ciao
>
> Leo
Wearnes (English Co.?) used to make a 2x CD-Rom drive that was ATAPI
(IDE) compatible, which had a Play & Pause/Stop buttons. No PIC
required. My first 486 box ended up with one, I liked it but ended up
upgrading to a 4x Hitachi eventually, and using a CD player to play
music. I've seen a few other CD-Rom drives with similar button
controls, don't recall the names (including some newer faster drives,
BTW.) Check at your local swap meet, & ask a couple friends to watch
for you, maybe?
OTOH, your Sony Walkman type CD players play Music CD's just fine,
usually, as well, and can possibly be found cheaper & easier, provided
you aren't needing to seek the music tracks on a CD-Rom but are just
playing a CD!
I have followed your suggestion on an 8X CDROM on a working PC. Simple
removing the flat IDE cable, and stops the starting of WIN95, the LED
blink... it works... sound come out for the stereo hearphone.
>Leo,
>
>Simple test - power up the CDROM with no IDE connection, and see if
>the audio controls work. If so, just use those!
>
>Cheers,
>Ben
>
>
>Leonardo De Palo wrote:
>>
>> Hi,
>> my 2X CDROM reader have volume knob, eject and forward button and a 3mm
>> stereo audio jack.
>>
>> I never see the schematics of CDROM reader.
>> I suppose there are two separate section, one for IDE interface and the
>> other for audio section.
>> Also I suppose that the audio section to start need power and some
logical
>> levels.
>>
>> Do you agree?
>>
>> Ciao
>>
>> Leo
>
>Ciao PIC'er friend,
>
>I have a question to ask to this community; anyone have idea about the type
>of interface needed to build to permit the use of older 2X or 4X CDROM
>reader for play musical CDROM, without the PC??
>
>It seems a crazy idea??
>
>Grazie for your suggestion.
>
>Ciao
>
>Leo
>
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