I was very lucky to get this machine. It was offered to my whilst I was collecting a job lot of monitors: "You might as well have that Master 128, although it's broken."
So I took it and opened it up when I got it home to find it was a Master 512 complete with Morley Masterboard. The only reason it didn't work at the time was that the 80186 board had worked loose.
Please click on the picture links above to learn more about this fascinating machine, and remember to come back here soon for there is more to come on using a hard drive with the Master 512.