@DosFox clone aficionado! I found a cool thing you might like.
Have a look at page 78 here: https://win.adrirobot.it/nuova_elettronica/pdf/nuova-elettronica-104-105.pdf

I went to buy food for my cats and came home with a paper copy of this old magazine, and there is a kit of an (allegedly) Apple IIe compatible clone described. Complete with schematics, pity the thing uses PROMs/PALs and of course those are not described in the article.

Would be so cool to find one and clone the clone...

To everyone that followed the discussion about the DELTA:
The person that sent me ROMs/PLDs dumps has confirmed they're the full set, but has yet to respond on the permission to release them. If I hear nothing for a few days, I will simply release them under my responsibility and credit him. He's not selling repros, that I know of.

@DosFox here has checked the ROMs and confirmed the main ones are mostly identical to unenhanced IIe ROMs: where the big difference lies is in the video ROM. Not unexpected given the presence of a 6545 CRTC onboard.
I guess that ROM will have to be studied. This curbs hopes of an easy "enhanced" mod tho

I still think this clone is totally worth a resurrection attempt. As such, I'll begin the process of rebuilding the schematic in KiCAD.

Hmm I re-read the component list. The DELTA uses a 6545 CRTC, not a 6845.

They are not totally interchangeable: http://www.6502.org/users/andre/hwinfo/crtc/diffs.html

I suspect this will be an headache, maybe minor, but one still, as not all 6545 seem equal either.

Also, I think I'll have to order a few, as I can't seem to have any in storage...

Differences of CRTC models

Differences of CRTC models 6545 and 6845

That's it. All the ICs for the DELTA (minus the video card) spread out.

Now I just need to wire them up.

Easy Peasy.

I've decided to start with the memory, so I begun placing the symbols and their connections.

Now, I don't know how you like to do that, but i mostly work with paper.
I take notes on paper, sometimes i sketch part of schematics on paper, and in these cases, I definitely work better by printing out the schematics and highlighting the parts I've already taken care of.

Enough for today. More than half of the first sheet (on a total of 3) of the schematic was converted to KiCAD.
@hkz I immediately recognized the style of Nuova Elettronica schematics, well before looking at the other toots of this thread :-) BTW, I recall quite well the DELTA project. It was an interesting computer!

@davbucci yup! It looks like a very interesting machine. Roberto from https://www.z80ne.com/ provided the dumps for the ROMs and the PLDs. He said there's a chance he'll come up with photos of the PCB, which would be great both in a duplication effort and in a troubleshooting process.

Crossing fingers that we can get this thing resurrected!

The home of Z80 N.E. - Il computer Z80 di Nuova Elettronica

@hkz Roberto is a true hero. He is hosting the website for the Olivetti M20, too: https://www.z80ne.com/m20/index.php He did this for free for more than a decade, now.
Olivetti M20

@davbucci yep, I saw your name in there. And I might need all those info sooner or later. I have two M20 s in storage, both with their screens cut away, but I wonder if there's still life in them.
@hkz very cool! The M20 is a very interesting machine. If you want, I can publish pictures of your machines here: https://www.z80ne.com/m20/index.php?argument=sections/photos/photos.inc BTW, let me know if you need information about how to repair/service them. I do not recall everything by heart, but if I can help it will be with pleasure.
Olivetti M20

@davbucci oh thanks! I will get back to you about this, you can count on that. And when I do, I'll also send you photos. Right now they're still behind a pile of other boxes after my last move...