[CamperBob2]

It works as a bus when the chip manufacturer is nice enough to add a couple of address pins. Unfortunately not all that commonly done.

[rowanG077]

I have never seen that actually. But also have never looked. I have used a binary decoder to achieve the same thing though.

[CamperBob2]

E.g., HMC983, and some of the former Peregrine (now Toshiba) parts.