I have the Szilagyi book also, it's lacking in a lot of detail too. It's one of those things where you have to buy 8 different books and try to piece it all together.
I respect a lot of what Direct Connection/MP and its engineers did ....but I also think they were what they were....a poorly funded, small group of guys who had hit-and-miss success. One thing is for sure....MP and DC always offered the poorest technical detail on its products. Very scarce information.