(I know, top post) For what it's worth, I recently brought up "robotron" on an FPGA using a verilog 6809. I was not the first, but the original code was all in VHDL, so I converted it all to verilog and then added a "hack scan buffer" so I could get output via HDMI. The bottom line is that the "cpu09" 6809 works quite well in an FPGA and runs robotron. It had a few bugs but they were minor. I do plan to put the verilog on my web site "real soon now" :-) honest. The most fun part was getting the sound to work through the one bit sound port on the pipistello fpga board. So, if you could craft a pcb with the pins in the right place, I think you could make your own replacement 6809. For that matter, you could probably just use an arm chip and do it all in software. I've considered doing that for slow HC11/12 parts. Using an fpga is more fun and it's easier to get the cycles just right. -brad On 7/3/14, 9:06 PM, Mike van Bokhoven wrote:

On Jul 3, 2014, at 9:06 PM, Mike van Bokhoven <mike at fenz.net> wrote: I wouldn't be THAT confident that it supports the E signals; a lot of synthesized cores do away with things like two-phase clocks when they're not useful for an FPGA implementation. I haven't looked closely at the source on OpenCores for the 6809, but I would imagine that it runs the 6809 instruction set without emulating its interface very closely. That said, with a little bit of glue logic, you can likely make use of such a core as a drop-in. Takes work, though. - Dave