Hello David, I never saw this book, it mentinons the MK14 and also that it was out of production at the moment this book was published. Does the book contain more SC/MP articles? and what is the title of the book?
I think I overlooked the CONT/HALT switch in the Elektor manual,it was published in the first issue and I skipped this part as I wanted to build the HEX input/output system straight away. I will add this to my processor board if I can find an empty spot
Your last posting gave me a lot of inspiration again to experiment with the original schematic, specially the way you changed the display strobing is something I want to try on my machine.
Benny