On a very similar model with the same BIOS you don't need to configure anything. Just connect a HD 3.5" drive and obviously use a bootable DD disk (or a HD with the hole covered).
If you got the original case/cables you might need a new cable as depending on the original configuration it's possible that the cable only has a 5.25" connector at the end intended for drive A:

Thanks.
Didn't understand it had to be 720k disk 😁
Now I just need to find proper boot image.

Aaaaarrrrghhh!
Been struggling with this whole day... Downloading different dos images writing them from Linux and from virtual Windows tried about everything....
Then it occurred to me that maybe it's just perfectly working Sony 1.44mb drive that just doesn't read 720k formated disks. Took old panasonic drive witch I've been using with amiga and the computer booted first try...
Aaaaarrrrghhh!

Good job. Yes there are some 1.44mb floppy drives that have issues reading 720k disks.

Cool I learned something today. So the Super-16 works with 3.5" drives! No more swapping millions of 360k floppies to copy stuff over!