How Computer Memory Works – Computerphile

How Computer Memory Works – Computerphile

How do logic gates store information? – We explore how computer memory works with Dr. Steve “Heartbleed” Bagley

Domino Addition — Numberphile: http://youtu.be/lNuPy-r1GuQ
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Opening up the 30yr old Mac: http://youtu.be/wFJrHuSXnZM

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran’s Numberphile. See the full list of Brady’s video projects at: http://bit.ly/bradychannels

50 Comments

  1. Earumamaadu on January 3, 2020 at 7:58 pm

    This made me sleep



  2. Inquisitour M29 on January 3, 2020 at 7:59 pm

    Which animation soft is used in the videos of this channel?



  3. Nineshadow on January 3, 2020 at 8:00 pm

    Ah, the classic latch RS.



  4. Vithor Temanski Neves Castelo on January 3, 2020 at 8:01 pm

    his face looks like a oblivion character



  5. Drayvel Harris on January 3, 2020 at 8:03 pm

    i love the smell of burning electronics in the morning



  6. Camille-Jean Helou on January 3, 2020 at 8:03 pm

    great



  7. Jacob Stewart on January 3, 2020 at 8:07 pm

    You should do a video on ternary cumputers such as Setun



  8. lifelongpilot on January 3, 2020 at 8:09 pm

    I’m out. 11:40



  9. GifCo on January 3, 2020 at 8:13 pm

    This was by far the worst Coputerphile video i have watched. Horrible explanation at the end.



  10. Harvey Smith on January 3, 2020 at 8:13 pm

    No current limiting? Shame on you sir……



  11. Samah Samiee on January 3, 2020 at 8:14 pm

    What is that white thing where he using the pins? Thanks 😅



  12. pafnutiytheartist on January 3, 2020 at 8:15 pm

    If you are interested in this stuff, go watch Ben Eater’s breadboard computer series



  13. terry waller on January 3, 2020 at 8:17 pm

    Lots of types of memory, there is bubble memory and core memory now there is digital memory.



  14. Lucas Alves on January 3, 2020 at 8:17 pm

    Please, could you say the name of that book? Thanks



  15. Qwerty 64 on January 3, 2020 at 8:17 pm

    Memory is a rs nor latch, at least that’s how it’s called between redstoners… Anyone here?



  16. Donovan clark on January 3, 2020 at 8:18 pm

    what book was that on 3:00?



  17. بن عبد الله بن جفال on January 3, 2020 at 8:21 pm

    Woow..you make it very simple thnx but you were using a boock what his title please…..



  18. The Ultimate Reductionist on January 3, 2020 at 8:22 pm

    THANK you THANK you THANk you!



  19. Courage and Peace on January 3, 2020 at 8:25 pm

    beautiful video
    I really wanted to know what is the working of the sr latch
    thanks
    once again great video…



  20. Dyrati on January 3, 2020 at 8:27 pm

    There is an intuitive way to explain what’s going on:

    Consider two NOT gates, labeled A and B, feeding into each other. This simple circuit already stores memory. When A’s input is 0, its output is 1. Then if you connect A’s output to B’s input, B’s output becomes 0. Connecting B’s output to A’s input does nothing, because A’s input was already 0.

    This is a stable circuit. The wire from A to B is on, but the wire from B to A is off. Now what happens when you supply power directly to the wire from B to A? A’s input becomes 1, and its output becomes 0, so B’s output becomes 1. By doing that, you have "flipped" which side of the circuit is "powered".

    This is effectively identical to the RS NOR latch of this video, the only difference is that the video uses NOR gates instead of NOT gates, which allows you to use the second input of the NOR gates to supply power to one side of the circuit.

    (This can be easily demonstrated in minecraft with two redstone torches feeding into each other)



  21. Pegglez on January 3, 2020 at 8:27 pm

    How did i get here



  22. SETH other on January 3, 2020 at 8:27 pm

    How come every single computer guy looks like this? lol



  23. Lloyd Stout on January 3, 2020 at 8:27 pm

    It’s called a latch



  24. MrPlaiedes on January 3, 2020 at 8:29 pm

    7:10 diagram in s really nice!



  25. Steve Hamann on January 3, 2020 at 8:34 pm

    Wtf i am doing here
    I was looking for kim kardasian brains



  26. Experimentor User on January 3, 2020 at 8:38 pm

    I hope that your next videos are more direct to the point..its so time wasting



  27. praveen kumar on January 3, 2020 at 8:38 pm

    But can it run crisis?



  28. Chris Green on January 3, 2020 at 8:39 pm

    Assumes you have an understanding



  29. huang junwei on January 3, 2020 at 8:39 pm

    Rs nor latch



  30. Gavin Craddock on January 3, 2020 at 8:39 pm

    Great video, seems strange that the term "flip flop" wasn’t mentioned anywhere? Also these can be built with NAND gates instead of NOR gates but then they become active low rather than active high (so you need a 0 input to set the output to 1 and a 0 input to reset it).



  31. Keith Citizen on January 3, 2020 at 8:39 pm

    I’ve seen this arrangement using pneumatic valve blocks the pull down resister function was an a air bleed instead.



  32. Edicius Bizaar on January 3, 2020 at 8:41 pm

    Ok @computerphile. I cannot find the answer to my query…maybe you could help? I got your vid by asking "how can you put information in a computer chip?". I understand the whole 1 on, 0 off deal, that’s not my question though. How in the world does those chips, made out of metal and stuff you could tell me I hope, hold numbers? How does a machine become capable of being able to put binary code into it in the first place? How did they figure that out too? What is so special about those chip, silicone right, that makes them able to put a language created by man, I hope or who if not, to have the ability to turn inputs off or on? I find it rather difficult to ask the correct question here. Lol. For I wanna know how it all began. How did they find out how to make the chips, how did they figure out that they could also turn those chips on or off? You getting where I coming from here? I hope so. If not I can put more detail I suppose. Just lemme know



  33. morominaolenmina on January 3, 2020 at 8:41 pm

    Great!!



  34. Jeffrey Black on January 3, 2020 at 8:41 pm

    I severely dislike that explanation.
    While logically, a NAND gate is taking an AND gate and then putting a NOT gate on the output, electrically it typically isn’t. Electrically it is very easy to make a NAND gate directly, and for CMOS, PMOS or NMOS, NAND gates are made directly and an AND gate is actually a NOT gate fed by a NAND gate; likewise the NOR gate is done directly and an OR gate is a NOT gate fed by a NOR gate.



  35. Botond Keresztes on January 3, 2020 at 8:45 pm

    They should have mentioned the S-R flip-flop’s inherent flaw, which is: if both R and S are 1, on the output Q and /Q will be equal to each other, which is obviously not how boolean algebra should work.
    Of course there is an easy way around this, just don’t let R and S be equal to 1 simultaneously. And the J-K flip-flop fixes this issue, but that requires a clock signal to work.
    Just thought this should be mentioned when talking about S-R filp-flops..



  36. Curtis Hubbard on January 3, 2020 at 8:47 pm

    what is the name of that book he was reading with the different logic gates on those chips?



  37. Ruslan Masinjila on January 3, 2020 at 8:47 pm

    Those connections on breadboard hertz



  38. level 3 neural network on January 3, 2020 at 8:48 pm

    the office: electronics



  39. Nikola Zlatkov on January 3, 2020 at 8:49 pm

    Why didn’t he show what happens when both inputs are 1? That’s the only non trivial part.



  40. Gideon on January 3, 2020 at 8:49 pm

    KitKat a lot of fun ! #Epitech



  41. Ethan Colbert on January 3, 2020 at 8:50 pm

    I just figure out why minecraft players call this an ‘rs nor latch’ I had no idea the name was based on actual terminology



  42. Lincoln Nguyen on January 3, 2020 at 8:51 pm

    He looks kinda like Larry Page!!!



  43. A L on January 3, 2020 at 8:52 pm

    Is all human are fool



  44. Leonard Euler on January 3, 2020 at 8:53 pm

    As a software type, I wouldn’t understand a thing from the video if I did not know Boolean algebra



  45. Veepedaldude on January 3, 2020 at 8:53 pm

    What is that book. I always have to Google the the data sheet.



  46. Darko Bakula on January 3, 2020 at 8:54 pm

    Wish they put this kinds of videos into Television instead of regular empty content show they put on TV’s nowadays which teaches you nothing. I understand it’s entertainment business but everyone has their own definition of entertainment and I was entertained by this.



  47. Güselchübel on January 3, 2020 at 8:54 pm

    Q and not Q are mixed up but…..



  48. Will of the people on January 3, 2020 at 8:55 pm

    What



  49. almuhanad Alhashmi on January 3, 2020 at 8:56 pm

    Practical Electronics Handbook
    2nd Edition THAT HE USE



  50. Emanuele Malimpensa on January 3, 2020 at 8:57 pm

    Name of the "Gate’s almanac" book?