Hello. Thanks for reading my post. I finally fixed the problem myself. The reason for the error messages was that I had CD0, CD1 and CD2 all together in DEVS: Dos drivers, when there should be only one, say CD0. I left only CD0 and now it works fine!
But now I wonder how can I use AmigaOS 3.9 to listen to music CD. I checked and the sound works well, but when I launch a CD player program within Amiga Workbench I get an error message saying that I have to assign a CD unit in order to listen to a CD rom, so I have sound through WinUAE program ( example I can listen to scores in Deluxe Music Construction Set ), but I cannot listen to a music CD that I put in the DVD rom of my PC, how can I fix this ?
Yes, you'll have to assign a device name and a unit number for said device.
Device name will be "uaescsi.device"
Unit number should be "1" or "2". Unit numbers start from 0 (which I presume will be your hard drive) so my guess would be unit 1, or 2 if you have 2 hard drives. You won't hurt anything though if you input the wrong unit number, so don't worry.