Therefore, different numbers will light up depending on which wire he uses to pass the AC current.These days core memory hacks are few and far between. Don’t get me wrong, I think it is cool to recreate old and bygone technologies, but in this case, if you are going to all the trouble of hand wrapping coils, make it RAM, not read-only.If a blob of solder is superior, why did they use this core rope technique on the Apollo guidance computer ?There’s many nifty uses for a core ROM, because you’re not limited to how many read wires you can pass through.You can, for example, use 7 cores and 128 wires to produce a keyboard where each individual keyswitch has a wire attached that loops through the cores corresponding to the binary code of that key. Core rope memory is a form of read-only memory (ROM) for computers, first used in the 1960s by early NASA Mars space probes and then in the Apollo Guidance Computer (AGC) designed and programmed by the Massachusetts Institute of Technology (MIT) Instrumentation Lab and built by Raytheon. "Informally, the programs were called ‘ropes’ because of the durable form of read-only memory into which they were transformed for flight, which resembled a rope of woven copper wire,” … Pressing the button down will produce a pulse that generates a corresponding binary code pulse at the output. Software written by MIT programmers was woven into core rope memory by female workers in factories.

I recently watched that video and always wondered how these worked.cool design. This was about 18 times the amount of data per volume compared to standard read-write core memory: the Block II Apollo Guidance Computer used 36,864 sixteen-bit words of core rope memory (placed within one cubic foot) and 4,096 words of magnetic core memory (within two cubic feet). This eight bit also serves as a clock pulse to a buffer that catches the signal and stores it for later use.The RAM version was the type invented first. I had the pleasure of working on the GEC 40/80 in the 80’s and we’d lift the lid on the core RAM, take a breath and look upon that grid with great reverence. That’s core RAM.Core ROM is similar, an X-Y grid of wires going through cores. To read it, you have to write it! Try to make a decimal to 7 segment decoder using only blobs of solder…mask-programmable ROMs needs address decoders and, at least, diodes.a similar technique has been used in old jukeboxes:Tormat. That applies to the “ordinary coincident-current magnetic core memories (used for RAM)” that they mentioned.
To read a core, you try and set it to south. Rope memory or core memory generates a very tiny pulse that needs to be amplified (by vacuum tubes or transistors). That is the main difference (and wiring style of course)This is superior to a blob of solder, as a blob of solder isn’t addressable, while this one is.
North or south. Rope memory or core memory generates a very tiny pulse that needs to be amplified (by vacuum tubes or transistors). Imagine your code being hard wired. All core work is devastating in its detail. If it was north, the field will change and that will induce a pulse in a “sense” wire, If it was already south to start with, nothing happens and there’s no pulse.

So a pulse at X-Y will or will not generate a pulse on sense, depending.Core “rope” is essentially a grid, but for some reason it suited them to knit it in a rope shape. I think you can make a bit of memory using a blob of solder– connect to Gnd for a 0, Vcc for 1. About relay-based CPU, they are not compatible. Core rope memory is a form of read-only memory (ROM) for computers, first used by early NASA Mars probes and then in the Apollo Guidance Computer (AGC) designed by MIT and built by Raytheon. The process of reading a bit from core memory (RAM) necessarily zeroes that bit. What a name! So you need to store your result in an electronic buffer, then re-magnetise the core before you’re finished.



(Although the cores may saturate with enough keys down)To capture the events, you rectify them to DC, and add an eight bit to denote whether the polarity was up or down. Only the sense wires vary. That’s my definition of ROM. Some programmers nicknamed the finished product By the standards of the time, a relatively large amount of data could be stored in a small installed volume of core rope memory: 72 kilobytes per cubic foot, or roughly 2.5 megabytes per cubic meter. Yep, knit, once they had the design mastered, lots of old women hand-knit megabytes of the stuff, over the years.It is not only the shape, it is the way that works different. but I dont think I would call this memory…ay! How good would it have to be ? 7 bits could be a life/death id and an 8×8 position.This would make an excellent sequencer for a relay-based CPU.if you know how to make this i dont think youd be using mechanical relays, unless you were making a robot.Very good article. Contrary to ordinary coincident-current magnetic core memory, which was used for RAM at the time, the ferrite cores in a core rope are just used as transformers. (there are some pictured on the web)I think that this is a splendid retro hack.

The RAM variand works by setting the core magnetization to right or left.


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