Some time ago I purchased this MC6205 display on eBay. I've been wanting to connect it to my computer and eventually build some sort of project with it. It came with a wiring diagram to connect via parallel. The display has an odd Russian socket on it but I was able to order the matching plugs on eBay. I made a cable but when I powered it nothing happened. I thought my cable was bad since It sure looks bad ;). I designed an adapter board with onboard jack for 12 volt supply and regulator for the 5 volt supply. After soldering and hooking it up nothing happened. I tried again and waited a couple minutes and parts of the screen started flickering then the whole screen flickered a few times and then it came on. It hasn't had issues starting since so it might have been a first time startup issue or an issue with sitting so long. It currently displays a bunch of junk since I don't have the parallel socket to connect it yet.
I found some software to send text to it. It's basic and I hope to reverse engineer the data it's sending to figure out how to write my own.
P.S. The display is currently upside down, since the port is on the bottom.