I have installed OS 3.9 on my Amiga 2500 many times. I have a GVP 'o60 accellerator and an old 4 speed Sony CD. I use a Retina 4 meg card and have a 2 Meg Chip and 32 megs of ram. Just needs 3 boots to go as I also use OxyPatcher. I have a 16 gig scsi HD divided into 4 3.9 disks and a 200 meg disk to install WB on.