A very off-topic angle to open source emulators ...

Computing seems to advance so slowly, maybe history has value?
Remember the BK0010 ?
The BK0010, BK0011, and BK11m home computers from the Soviet Union
Based on the PDP-11 architecture using a K1801VM1 CPU
Been a while since you used one?
Go and run one for yourself. Or an Archimedes. Or a ...