lordv wrote:
Is it possible to take only IDE-related features of OS3.9 to my 3.1 (which is mixed somehow with 3.5 utilities
in order CF to work and to replace idefix, while maintaining 4ide feature?
Maybe. If you have an OS3.9 CD you could try putting the AmigaOS ROM Update in the DEVS drawer on your 3.1 machine and then put the 3.9 setpatch in your C: drawer, and see if this successfully updates your scsi.device to the 3.9 version while keeping 3.1. If it works then you might be able to access the extra devices on the 4 way interface without IDEfix.
lordv wrote:
I'm not very glad swapping and tuning OSes, I prefer when everything functions in a known, stable manner. 
Well, I have found 3.9 to be very stable once the updates are installed. I would not like to go back to 3.1 now.
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moto