DMS-10: The first phone call!
17:01
🔌 DMS10 — Power Up! ⚡️
15:43
What happens if you leave your phone off the hook?
17:32
2600? How Phreaking Really Worked
16:34
Booting up the 3ESS
18:32
Crossbar telephone exchange demo
28:19
Malfunctioning Potted Relays: Emergency Repair in the No. 5 Crossbar
27:08
At the Connections Museum: the insane telephone technology that led to today's computers
17:58