Mauro73 wrote:
I can't understand this os rom thing
OS3.9 has its own version of Kickstart. But it's not on a chip, it's in the form of a file on hard disk. Setpatch applies this update on cold boot so that your Amiga is running Kickstart 3.9, which includes an updated scsi.device which is safe to use above 4GB.
But you don't really need to know that. I was really just pointing out that if you're trying to hack OS3.9 features in to OS3.1, then it's not as simple as copying Setpatch. If you're actually installing OS3.9 in full then don't worry - it will take care of all of this stuff for you.
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moto