Hi Ben I think Olivetti was the only one I know of. The M20 ( I have one of these working ) was the most common. The M20 was also labled as L1 for some markets. I think there was a M30 and M40 that also had the Z8000 as well( not to be confused with the M24 that most have seen ). There were a number of custom applications and even some Multibus boards made with Z8000's but in the desk top like world, I think the M20 was it. I've got both PCOS and CPM8000 running on my M20. The board, Joe has, has the MMU so it would be a candidate for getting CPM8000 up on. I'd be a lot of work to trace out how things were interconnected. Not an easy project without some board schematics. I could assist anyone wanting to get CPM8000 running on a Z8000 system but before starting to build one, contact me and I can describe some of the design requirements. Dwight