I just got the DEC PDP-9 at the Rhode Island Computer Museum to boot the ADSS monitor and run a "Hello World" program again. That again makes it the only running PDP-9. There are no integrated circuits in the PDP-9, just lots of transistors.
@sdf_pubnix Then the memory chassis, data channels, disk controller, disk drives, magnetic tape controller, magnetic tape drives, communications controller, printer controller, and card reader controller. You will be inventorying cards for quite a while.