Finally the machine is ready. I dug out an old CD-ROM, it's called GoldStar GCD-R520B. It didn't work. At least until I fixed the loose IDE cable. No problems since then. The drive has been manufacterd in June, 1995, and the vendor is now better known an LG, and they still have a web page about it. The drive is fine, that's what I call standards :) It can't read CDDA, but it's only a double speed drive anyway. Good for recovery boot, if I replace that stinky cable. Really surprising to have something this old, and mechanical still working nicely.
Maybe not at all, if I think about it. I also have an A3000UX which was in a previous life called cbmvie.commodore.co.at, until my friend bought it from the sell-out from Commodore. Unfortunately, most data from its hard disk is long gone, including traces of the Commodore System V Unix itself. I didn't know better. But at least it has a Commodore ethernet card, which is still a rarity.