I see various hobbyist cards like this one for the S100 bus, even today, I presume because the S100 bus is is not covered by any current patents, and is electri

I see various hobbyist cards like this one for the S100 bus, even today, I presume because the S100 bus is is not covered by any current patents, and is electrically simple and easy to build. But AFAIU, one of the downsides of its simple passive electrical nature is you will very quickly run into clock speed issues using chips from the late-80s onward to their full potential. There were other buses available, e.g. the VME/VersaBus designed by Motorola originally for their 68K line of CPUs and later standardized. I can't help but wonder, have any other bus designs from the late 70s or 80s been revived for hobbyist purposes, or perhaps a whole new bus designed to overcome the limitations of the S-100 or similar designs?