So I've got the PCB's now. I got 10 of them instead of 4 or 5...
I've soldered the first one together.

HCA 2017.jpg

The software part will be the winter I guess...
At this moment I'm busy to repair a few Anita MK8 and MK12 calculators...
No chips, just tubes, valves and nixies https://youtu.be/6-qvtiqWens
I hope I can get my hands on a real computer whit this technology once!

But TTL pcb's like this HCA controller gives much pleasure too...

Regards, Roland