From: Kenneth Alan Boyd Ramsay
Subject: Re: Design a simple switch circuit to control CD ROM
X-Original-Trace: 31 Dec 2002 22:21:34 -0500, torfree.net
Date: Tue, 31 Dec 2002 22:21:31 -0500
NNTP-Posting-Date: Tue, 31 Dec 2002 22:21:40 EST
On Thu, 26 Dec 2002, HardwareLust wrote:
> wrote in message
> > I want to design a simple interface or a series of switches that can
> > command the 48X Goldstar/LG Electronics CD ROM to fast forward,
> > reverse, play, and pause audio CD without connecting to a computer..
Can you be a little more specific about what you are trying to do? For
example, will jumping to outer (inner) tracks do for "fast forward" and
("reverse")? Or do you really want to play the sound at high speed or
Most motors can be reversed by swapping two connections - that's where
you would connect the reversing switch.
Depending on what you want to do, a schematic of the drive could be a big
help in determining where to make your connections. Without a schematic,
you pretty much have to stick with the standard IDE or SCSI commands.
You don't want to get involved with a proprietary CDROM.
> OK, the big question is WHY would you want to do this? Second (and more
> important actually) is what are you going to do with the CD reader that
> can't be done with a portable CD like a Discman? If you want audio, a $20
> cd player from Target of Wal-Mart is wise investment if you're
> Third, the odds of doing this are pretty much nil. Assuming you're talking
> about an IDE/EIDE drive, there is NO way to duplicate commands on the IDE
> bus with "a series of switches", and a "simple interface" is basically going
> to consist of some type of portable computer with an IDE interface built in.
Right, it will take more than a "simple switch", but you could use a
microcontroller, or even just a serial interface to transmit the
appropriate code sequence for each switch/command.