Yes, it was actuality circuit switching, every serial port has it's number assigned and each computer could "dial-up" each other, but there is also a "virtual"

Yes, it was actuality circuit switching, every serial port has it's number assigned and each computer could "dial-up" each other, but there is also a "virtual" number that anyone could dial up to (even at the same time) that will connect to a PPP session to connect via IP/TCP to the outside word. This last part was the one that still need a bit of work since it doesn't always work as i expect. So i, basically, do both. packet and circuit network according to need. As far as circuit-switching...I know I've seen hardware devices that did this, but not in decades, so likely not easy to find any more software based circuit switching seem to work fine for what i need, is really not that complicated, it also make me do cool thing like wiresharking!