I have 3 MicroVAX 3100 Model 30s given to me by someone who is leaving the country and could not take them with him. I took them rather than see them discarded. They each have 8Mb onboard memory. They do not have any disks and the cover on the storage bay is missing. One of them has a little bit of damage to the rear plastic panel. I cleaned out all the dust and powered them up, they all booted to the console prompt just fine. They are in Greater Manchester, England. Regards Rob