FYI, a new Mark 8 now exists - mine. I built it using wire wrap on 0.10 inch perf-board, with point to point wiring for power. I used 0.10 Molex sockets with standard header pins for a motherboard (they are not as long and sturdy as one might like, but, oh well). Works fine. In the process, I captured the schematics with KiCAD, and then routed some PCB boards. Some of the PCB boards have been manufactured, and are awaiting construction. The others have been ordered. Also, in the process, I am testing a concept of replacing the Signetics 8263 and 8267 chips with programmed GALs (I had enough real ones to build my prototype and build out my PCBs). You might be able to see them in my Facebook album, I think, though my Facebook page is generally not publicly viewable. Try these links: Mark 8 (my wire wrap "prototype"): https://www.facebook.com/media/set/?set=a.562945557100074.1073741829.100001… PCBs: https://www.facebook.com/media/set/?set=a.562952890432674.1073741830.100001… BTW, is there any interest out there in: 1) Sets of PCBS? (They would be around $500 per set, I guess - I would not WANT to make and sell them in any quantity!). 2) GALs on little boards to substitute for the 8263/8267? JRJ