Hello I have a Derringer Platinum 030 installed in my A2000 wih OS 2.1. I intend on upgrading to OS 3.9, however the Derringer has a feature wich allows the kickstart to be moved into 32 bit ram to speed up performance. According to The Big Book of Amiga Hardware web site, this may not work correctly with newer versions of Kickstart such as V3.1. There is a simple way to disable this in the user startup script, But are there any Derringer 030 owners with a 3.1 rom, who can comment on this? :-)
