Since the first post a lot of happened:
- Motherboard PCB (bottom) has arrived, it is now part-way assembled with components and working quite well. First test-SW (a few instructions in a loop) is running OK.
- I designed the second PCB (top) with video (VERA), audio (AURA – FM synth) and ethernet port. This was also manufactured, part-way assembled and now I have the first VGA video output.