Have you used it in conjunction with the other standard RC2014 boards like the real time clock or compact flash storage? I've held off on buying an RC2014 kit because my true 8-bit love is the 6809. If your card works as a replacement for the Z80 I'd buy the whole lot.

Now I've got cubix running and run a few things the compatbility appears to be good and I've run stuff like the CF adapter with it. In general the problems with other processors are always with the Z80 peripheral chip based cards as these devices expect an exactly Z80 bus cycle pattern. The CF can be touchy even on Z80, but does work nicely in Cubix on the 6809 and the 16x50 uart works fine. Not tried a 6850 for authenticity yet. A 6821/6840 I/O card design is done but waiting until I next send stuff off to JLPCB.

Yes but I'm not entirely happy with it. It works with the classic 65C02 processors but the WDC ones have different timings - in particular they have no hold on the data lines when the clock cycle ends, whilst the other devices have 30ns. On a single board there is enough capacitance etc that this issue can usually be armwaved away but on RC2014 you've got two gate delays on \RD and \WR *and* you've got a long bus so the 'ignore it and it'll magically work' approach does not work.

I'm currently playing with using phi0 for RD/WR or skewing the clock to the CPU versus RD/WR as I do with the 65C816 board.

Do you have a 6502 RC2014 processor board too?