Update:

> http://www.geit.de/images/hm12072013/images/img_0010.jpg
> http://www.geit.de/images/hm12072013/images/img_0011.jpg
> http://www.everymac.com/ultimate-mac-lookup/?search_keywords=PowerBook3,5

"Titanium PowerBook >3,5< [...] has been inofficially enabled for MorphOS since release 3.4 but I couldn't get the sound to work properly."
http://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=9960&forum=11&start=1