For this year’s Hackaday Prize, we’re doing something special. We’re introducing achievements for Prize projects. Think of them as merit badges. If your Hackaday Prize project has multiple parts that ...

Once you’ve seen this beauty of a relay computer in action, you’ll find it hard to resist the lure of building something similar yourself. Once you’ve seen this beauty of a relay computer in action, ...

This mini-series of articles describes how to build a computer’s CPU (central processing unit) out of relays. “Y” in English sounds like “guay” in Spanish (my mother tongue), a colloquial expression ...

However you make a digital computer, you need something to represent a binary digit. Usually this is some form of switch: a relay, a tube, or a transistor, although there have been other ways to ...

Apollo Guidance Computer in his basement. Our new hero is Harry Porter, a wizard from Oregon, who is building a computer the old-fashioned way: by hand, using 415 relays, 111 switches and 350 LEDs ...

66 years ago today, on the 9th September, 1947, operators of the Mark II Aiken Relay Computer being tested at Harvard University, found something curious trapped between points at Relay #70, Panel F.