So I managed to acquire a ANS 500 with 96MB RAM but no hard rive. It started up first time into Open-Firmware. I am now learning a lot about this weird piece of Apple history. I believe it is the only Apple computer sold without an Apple operating system. It has a very weird physical locking system with keyed locks back and front. The locks are also electrically active and the server will only perform certain functions depending on the position of the key. As an example you can install the OS unless the front key is in the service position. So guess what, I need to install the OS as it didn't come with a drive AND the front lock is seized. I had to do a bit of detective work with a multimeter but I managed to work out what pins did what on the lock so was able to hot wire the thing. Now time to actually install the OS. I will keep you posted.