Unfortunately, it has been a long time since I could work on my Z-80 homebrew; it has been in storage for many months. However, my setup is active once more and I have built the processor board. It consists of a power supply, clock, reset logic and buffers for the data, address and control busses. Unlike the I/O board, whose schematic is only in my head, I have used KiCad to design the circuitry and I will upload that separately.
On a separate board lives the I/O decoding and memory, on which I’ve made a start (see picture above). It’s all designed for easy testing and expansion, hence all the chips are socketed. I’ll update soon with the schematics and pictures of the finished article!