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submitted 1 year ago by kaptaan_jack@lemmy.ml to c/memes@lemmy.ml
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[-] mkwarman@lemmy.world 82 points 1 year ago

And it wasn't just a 4KB "stick" of RAM or something, it was literally magnetic rings threaded onto wires called Magentic Core Memory. Further, 4 KB implies that it was 4096 bytes, but it was actually 2048 "words" consisting of 15-bits (+1 parity bit) [source]. 2048 words requiring 16 bits each means 32,768 magnetic rings weaved onto tiny wires. Oh, and another fun detail about magnetic core memory is that if you read a value, I.e check to see if one of those magnetic rings is set to 0 or 1, that is a destructive operation. So if you wanted to read without deleting, you have to read and then immediately rewrite.

[-] IHeartBadCode@kbin.social 29 points 1 year ago

Oh, and another fun detail about magnetic core memory is that if you read a value, I.e check to see if one of those magnetic rings is set to 0 or 1, that is a destructive operation

Yeah, this is the same thing with modern RAM. The Magnetic Core Memory is doing roughly the exact same thing modern DRAM is doing. In the MCM it's magnetic hysteresis that's holding a bit of magnetic charge, in DRAM it's a tiny capacitor holding a bit of an electric charge. Either way, the charge is placed into a thing called a sense amplifier. The amplifier is a flip-flop circuit. During the refresh cycle the state of the sense amplifier is written back to the cell whence it came.

Static RAM, SRAM, is the kind of RAM that a read is non-destructive. It's really expensive (Here's a 2MB SRAM as an example of cost) and doesn't do well at really fast clock speeds at the moment. However, SRAM is really simple to interface with (Block diagram on page 1 and you can see you just have Address pins (A0-20), IO pins (I/O0-7), and the control pins that you turn on or off to indicate what the heck you are doing with the chip (CS#, OE#, WE#). Which the OE means output enabled (read) and WE means write enabled (write). See super easy to interface with) and it's usually what's used when folks proto circuits that need RAM. It doesn't matter what your clock speed is nor how you probe the contents of the memory, all of it is non-destructive. But DRAM, is stupid cheap compared to SRAM and handles higher clocks a lot better.

[-] SexualMastadon@lemmy.world 10 points 1 year ago

This is a quality ass comment. Cheers to you.

[-] Gormadt@lemmy.blahaj.zone 10 points 1 year ago

Here's a link to a Smarter Everyday video that talks about it

Linky link

He has a number of videos on it if you want to deep dive into it. Trust me you do it's cool AF

[-] PipedLinkBot@feddit.rocks 11 points 1 year ago

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this post was submitted on 19 Jul 2023
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