You do have to do (3) but that is because you start out upside down. There is no way to use two 40-pin IDC DIP headers and turn that around. Unless you separate the ribbon cable and swap every 2 wire-pairs... Actually might try that I'll put some double sided tape on the cover and stick the wires to that - see how that goes... Edit: went well.hoglet wrote: ↑Tue Oct 22, 2019 2:38 pmOne idea to consider...
1 - use my existing adapter board and on the bottom mount a 40-pin SMT DIP socket, like one of these.
2 - make up a short cable with a pair of 40-pin IDC 0.6" DIP Headers and some 40 pin IDC cable. These are hard to find, but do exist.
3 - solder a second CPU socket onto the bottom of your CPU board
Step (3) is necessary because I think step (2) mirrors the connections.
I also found out that the 40-pin DIP headers I've got have pin 1 of the DIP on wire 2 of the ribbon cable. That is so backward. With the same trouble they could have made a saner version...
The parts for my adapter board are on their way (even had some 100nf laying around, because they are nowhere to be found right now) so it should not be long before I can start on that.