In a fewer museums astir the world, determination lies the peculiar acquisition of seeing immoderate of the earliest computers. These room-filling monsters person aggregate racks of vacuum tubes that are kept moving by the dedication and attraction of their unpaid maintainers. A sojourn to the primordial vacuum conduit computer, Colossus astatine Bletchley Park, UK, led [Mike] connected the way towards designing an wholly caller one. He thinks it’s the archetypal to spot the airy of time successful implicit 5 decades. ENA, the Electron conduit New Automatic Computer, is the result.
It uses 550 Soviet 6N3P treble triodes, and its 8-bit Von Neumann architecture is constructed from the tubes wired up arsenic 5-input NOR gates. ROM is simply a diode matrix, and RAM comes courtesy of reed relays. The full happening is assembled arsenic eleven PCBs connected a wall-mounted frame, with a console that holds the portion de resistance, a show made from an array of LEDs. A Pong crippled is successful development, meantime the instrumentality makes an awesome country heater.