hmm, don't know about the 200, I've got a 100B machine and the keyboards plug into the back of the display units from what I remember. I think you could use a VT100 keyboard, don't know about mouse support (presumably standard serial as on a PC...) hard disk controllers and colour display boards were like gold dust for these machines... blank disks are probably pretty rare these days if the 200 uses those same strange two-in-one disk drives that the 100 had - you had to have disks without the centre reinforcing rings or they'd screw up the drive spindles over a period of time.... cheers Jules