I don't see any problem with it either, my understanding was that the following weight classes existed around (and slightly before) that time: Mainframes = roo

I don't see any problem with it either, my understanding was that the following weight classes existed around (and slightly before) that time: Mainframes = room sized montrosities Minicomputers = multi-cupboard units Superminicomputers = just one cupboard or small fridge Microcomputers or personal computers = these guys in the article