PDP-11/40 (a.k.a. 11/35) emulator for various microcontrollers
gitlab.com
gitlab.com
I wonder now, what's the smallest device you can make that runs PDP 11? You probably only a usb for a keyboard, RF/HDMI out, and a power jack, no?
As long as you don’t mind using modern IO devices, a (emulated) VT100 connected to a UART would be historically accurate. You could even bit-bang the serial port with a couple GPIOs.