@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
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...
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.
I think the first sheet is done.
It needs cleanup, reordering. Maybe some net labeling.
But it's done. And so I am for today.
The DELTA schematics (minus the two video boards) have now been transposed into KiCAD format. Ended up being a bit of a rat's nest in some parts, but this'll be a concern for future me.
I'll now wait one or two days then have a look at them with a fresh eye, and see if I spot glaring errors on my part.
I'm left with just an unused gate, and the electrical rules inspector not complaining (too much), which is encouraging.
Once this is done, I will release everything for others to peruse. I hope I'll be getting the photos of the original PCBs by then, as those will help greatly in recreating the board and spot additional errors.
hkz
The_Faeder