Photo – and Video – of Magnetic Ferrite Core Memory | #retrocomputing
Flickr user ultrapurple uploaded the image above that’s a remarkable close-up of a piece of ferrite core memory – the wiring on these things is nearly impossible to comprehend by today’s standards, especially considering the limited amount of memory provided!
Seen at the UK National Physical Laboratory Open Day, May 2018
This is a small section of hand-made magnetic core memory, used on very early computers. The rings are made of ferrite (a material with magnetic properties) and each store one single ‘bit’ of information. You’d need about 7 per character, so what we see in the photo is way short of what you’d need to hold a tweet.
Now the photo ultrapurple took is of a piece of core memory that couldn’t hold a tweet…but this video from EEVblog shows a 400 character memory bank that could store a tweet!
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.