I use circuitjs a lot and I just noticed that it now handles relays. After a great exchange with its author, the relays are now more configurable and can simulate hysteresis !

During the tests, it didn't take long to design a bitslice with the 8 registers and the write circuits:

Having drawings and sketches is nice but making the circuit work is priceless ! Thank you Paul !

Temporary link: https://tinyurl.com/yh8b8ue4

With this many parts, the simulation runs quite slowly. It took minutes to overwrite the 2 leftmost bits but it works as expected !

Adding the read logic is pretty easy at this point but the simulation will be slower.