DEC vt100 keyboard layout.
Source: VT100 User Guide, Digital Equipment Corporation, EK-VT100-UG-001 (1978).
Interesting features of the keyboard:
There is no Alt key. So, for emacs users, you have to press Escape instead.
There is a SETUP, on top left. From the manual: “This key is used in conjunction with other keys to perform specific functions such as setting tabs, scrolling, and altering terminal characteristics.”