Many can read from it, but only 1 (the bus driver) can write into it Deals with the issue of only wanting to get 1 input from several cells connected to one master “lane”. Multiplexers work but these are more elegant!
How do they work? Tri-state buffers! It’s literally just a switch. Input goes in and out, but WE determines if there’s a physical bridge or not between A and Y
- Z = open circuit = high impedance = neither
0or1!