He did the schematic and worked out the logic. I did the PCB design, collaboratively under his watch. He is very precise and it took many iterations to reach a point where he was satisfied with the board and would allow release to manufacture.
I love him, but unkind words were uttered late at night.

That said, if I were to collect together his emails and publish them, they would be the definitive hardware guide to the inner workings of the QL.