I never got why the relays used in old computers were so large. Typically relays are power devices so they are kind of beefy. But for computers of that era I al

I never got why the relays used in old computers were so large. Typically relays are power devices so they are kind of beefy. But for computers of that era I always thought it would be possible to create boards with much higher relay density. We did have quite advanced manufacturing technology at the time. Maybe it really wasn't as much of a concern and transistors and IC came online before it mattered.