On Sat, 24 Oct 2015, Brad wrote: The patterns for most of the Mark-8 pc boards were published in Radio Electronics (except for maybe the cassette interface?). I'm not aware of anyone who has redrawn them having made their versions freely available however. There have been a few people in the past who have offered unpopulated reproduction pc boards at significant cost, but they were beyond my budget for such a hobby project.

On 10/24/2015 2:21 AM, Brad wrote: Yes, the Mark 8 is within the realm of the hobbyist. I am not certain how the kits that were sold online were done. I did my own replica. I first did it by creating a schematic in KiCAD, and then built the thing with wire wrap and tested it, to make sure I had my schematic correct. Then, having verified the schematic with the wire wrap boards, I used KiCAD to lay them out as closely as I could manage to the originals (I had the original documents that I bought back in the day), and had Gold Phoenix make them for me. I think the boards cost me something like $500, done as two separate panel orders (along with some smaller boards to fill out the panel), but I ended up with two Mark 8 sets, because Gold Phoenix made a mistake on the first run, and so I got two of the first panel. So then when I got those back and verified them and was ready to order the second panel, I had two of them made. So, it presumably could be done for a bit less. There are a couple of Signetics parts that can be hard to find, but when I did mine I could get them from Little Diode in the UK. However, because of the scarcity of the Signetics parts, I also designed little GAL replacement boards for them that were physically compatible. I never did do a suitable case for either replica. You can see photos of what I did, wire wrap and PCB, here: https://www.flickr.com/photos/100660569 at N02/albums/72157635194594542 https://www.flickr.com/photos/100660569 at N02/albums/72157635953237715 However, I don't have any to sell. JRJ