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:
YouTube’s Secret Algorithm:
Opening up the 30yr old Mac:

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

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

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  1. Chidi Justice says

    This video helped me understand this topic in the Coursera course From Nand to Tetris

  2. James B says

    Can anyone explain how this is called storing, i understand how it works, but how can you store more than one bit using this method?

  3. Brad Camroux says

    That's just an R-S flip-flop 🙂

  4. Mordred Prime says

    Book: Practical Electronic Handbook.Ok let's go.

  5. Physics&Math says

    Demorvies theorem .(a+b)'=a'b'(ab)'=a'+b'

  6. Adam Hunt says

    11:13 that zoom

  7. Edwin Schaap says

    0:30 That’s a Atari ST logic board. How do I know? 😉

  8. Stevie Ray says

    I just wanted to say that I think the graphics you used in this video were very helpful. In particular, I enjoyed the pattern of the logic gates you superimposed upon the computer chip that is displayed at 8 minutes, 55 seconds of this video. This inspired me to ask the following question, do you know if anyone has ever manufactured one of these chips with the logic gate patterns either painted on top of the chip or perhaps etched into the top of the chip ? I think this type of display placed on top of the chip would be a nice aid for people learning to use this technology. Or maybe a sticky label could be added showing the pattern on top of the chip ?

  9. Dennis van Mierlo says

    I do like the Computerphile videos. But this one very poorly visually presented.

  10. Darko Bakula says

    Steve is brillant.

  11. petarpetrov89 says

    The video would greatly benefit from drawing the diagrams of the circuits in true Computerphile style.

  12. Widi says

    I got PTSD of my college years by watching this

  13. James Buchanan says

    Is the mouse still going 6 years on?

  14. Mohit Agrawal says

    What is a and gate or nan gate he was talking about.

  15. Richard Tocci says

    And he replaced the AND chip with the NOR chip without disconnecting power #rebel #nofucksgiven

  16. niksatan says

    best computer graphics to explain this

  17. Keith Wilson says

    reverse-engineered alien technology. IT. HAS. TO. BE. !!!!!!

  18. Vishal Arya says

    What's the logic book you're using?

  19. IAmAgainst says

    Computers' ram is not based on logic gates..

  20. Pegglez says

    How did i get here

  21. Dyrati says

    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)

  22. Keith Citizen says

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

  23. praveen kumar says

    But can it run crisis?

  24. lifelongpilot says

    I'm out. 11:40

  25. Gavin Craddock says

    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).

  26. The Ultimate Reductionist says

    THANK you THANK you THANk you!

  27. Donovan clark says

    what book was that on 3:00?

  28. Cosimo Baldi says

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

  29. Lucas Alves says

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

  30. level 3 neural network says

    the office: electronics

  31. SETH other says

    How come every single computer guy looks like this? lol

  32. almuhanad Alhashmi says

    Practical Electronics Handbook
    2nd Edition THAT HE USE

  33. Emanuele Malimpensa says

    Name of the "Gate's almanac" book?

  34. Lloyd Stout says

    It’s called a latch

  35. MrPlaiedes says

    7:10 diagram in s really nice!

  36. Edicius Bizaar says

    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

  37. Steve Hamann says

    Wtf i am doing hereI was looking for kim kardasian brains

  38. tech guru says

    Is all human are fool

  39. Jacob Stewart says

    You should do a video on ternary cumputers such as Setun

  40. Experimentor User says

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

  41. Drayvel Harris says

    i love the smell of burning electronics in the morning

  42. Veepedaldude says

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

  43. Chris Green says

    Assumes you have an understanding

  44. Will-i-am says


  45. Botond Keresztes says

    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..

  46. Gideon says

    KitKat a lot of fun ! #Epitech

  47. morominaolenmina says


  48. pafnutiytheartist says

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

  49. Ethan Colbert says

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

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