Just a little update as I’ve only done a little bit of work on the Z80 this evening;
The LED matrix board now plugs in to my Z80 backplane!
Sadly, the rainbow coloured ribbon cable you saw in the photo a couple of days ago was 14 way. So although it looked much nicer, I would have had to drop one of the data lines and the IRQ line to use it. (It was tempting though!).
Still no delivery from OSHPark though. Now only got a week left to fill all those empty slots on the backplane!