I now remember why I usually go straight to PCB for hardware development…
But my #RC6502 lives! Here it is booting OSI Basic, with a clock of 3.6864MHz. It tries to run at 7.37MHz, but the limiting factor is the FT245 board, it only works reliably to about 5 or 6 MHz. I expected that, so no big deal.
Of course, it always helps when you set the base address of the ACIA correctly. That had me wondering what I got wrong for an hour or so