Along with Trammell, we got our hands on a DEC PDP-11 to play with. "Modern" DEC VT100 terminals came along with it. This is what their dusty keyboards looked like.
The arrow keys are in a very strange position and they do not follow the hjkl layout. The Set-Up key seems to be used as an escape to control terminal features. It's unclear what the PF1-4 keys are for.