Get Roped Into Magnetic Core Memory with this 512-bit Module

Magnetic Core memory was the RAM at the heart of many computer systems during the 1970s, and it's undergoing a resurgence today thanks to its unique characteristics as an easily DIY-edible form of memory for enterprising hackers. One individual, [Han], has created an excellent resource that delves deep into the best practices for wiring up core memory, pairing it with his 512-bit MagneticCoreMemoryController on GitHub.

Magnetic Core memory works by storing data inside the magnetic flux of a ferrite 'core'. By magnetizing it in one direction, you have a 1; magnetize it in the other direction, and you have a 0. Sensing is current-based, and erasing requires a read-write circuit. If you're eager to dive into the nitty-gritty details, [Han]'s writeup provides an exhaustive explanation, complete with how to wire the ferrites and oscilloscope traces to illustrate why certain configurations are necessary.

[Han]'s design brief is arguably the most comprehensive written about magnetic core memory in recent years. His 512-bit MagneticCoreMemoryController proved to be rock-solid, running for 24 hours straight and undergoing multiple continuous memory tests – a total of several gigabytes of information with zero errors. This is a testament to the strength of ferrite memory, which has always been characterized by its ability to withstand power loss while preserving data.

While 512 bits may not seem like a lot in today's computing landscape, it's more than enough for experimentation and creative projects. We've even featured smaller magnetic core modules, such as the Core 64, in previous articles. These tiny memory packs were once ubiquitous in the retrocomputer world, with entire cabinets filled with them.

It's worth noting that Magnetic Core memory should not be confused with Core-Rope memory, which was a ROM solution of similar vintage. The Apollo Guidance Computer, for example, utilized both technologies. We'd love to see innovative hacks that take advantage of these pre-modern memory modalities – if you know of any, please share your discoveries.

For those interested in exploring the world of Magnetic Core memory further, [Han]'s resources are an excellent starting point. With his guidance, you can start building your own DIY magnetic core modules and experimenting with this fascinating technology.

Read [Han]'s Writeup for More Information

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