Thanks everyone for being so patient on the 858D++ project. Somehow I still can’t get around to finish this project as again I struggle to find/make time to work on it. At the moment I have no idea whether I’ll ever get to finish it. So I decided to upload the draft schematic so at least people can have a look and use what they like. It’s a draft so there are probably errors, oversights and there are design notes missing. Find the PDF file on the Heart of Technology github. It’s published under Creative Commons CC BY-NC-SA 4.0 license.
I’m afraid I won’t really be able to answer questions; if I’d had the time I’d spend it on the project itself – my apologies beforehand for that.