DUO 128 Elite, 4 bit CPU

We’re not sure how we missed [Jack Eisenmann's] 4 bit TTL CPU when we were tipped off the first time, but we’re glad it was sent in again for us to feature it.

41 different ICs (mostly TTL) come together to comprise the DUO 128 Elite. While the architecture is a little different than what we’ve seen before, using “nyckles”, the DUO 128 Elite still works perfectly. Catch a video of some example programs, including pong, after the divide.

[Thanks Marc G-C]


  1. Decepticon says:

    That is rawesome! Yes, I said rawesome.

  2. Garret says:

    Thats a lot of very sexy wire-porn.

  3. Matthias_H says:


  4. monkeyslayer56 says:

    needs a bigger display.. other then that SWEET!

  5. Tails says:

    now thats classic cool, awsome work man, epic hack, a bigger screen would be nice as was said before but still, sweet build

  6. stib says:

    Now I’d just love to see someone try to take that on a plane. “But officer, it’s my laptop!”

  7. Ben Ryves says:

    Very impressive work!

  8. Paul says:

    I love the sad face in the one-player pong game :)

    * :(

  9. greycode says:

    This is very awesome. Seriously. Mr. T. Geek Props. Kick Ass. Chuck Norrisy. Fricking hell yes. You have got to tip your hat to someone who just uses TTL. Of course, this is not going to do much, but you did build it, and it does do something. More than I have done. I would hate to do an encryption program on one of those.

  10. fotoflojoe says:

    That is Sheldon Cooper awesome.

  11. kristian says:

    words cannot describe how epic this is…

  12. Anonymous says:

    Well, this is by far more “handwork” than us building our custom 8-bit processor on a FPGA, but I’d rather use programmable logic instead to achieve something bigger.

    Nonetheless, he got ballz to wire up all that stuff.

  13. Frank says:

    After the divide!?

  14. cannonface says:

    I bet old tetrises have better cpu than this whole box alltogether :D

    Stop this wire nonsense and make your own pcbs… Wouldnt take up more time.

  15. Harvie.CZ says:

    Only thing i can say is:
    “where is the 3d acceleration?”

    oh sorry :-) i mean:

  16. ewertz says:

    All of the sudden I have a craving for spaghetti, dunno why.

  17. hcaz says:

    Awesome. [Insert other words of praise here]

  18. brandonman says:

    Wow. Makes me itch to trash the whole basement again by pulling out all my stuff and working on mine again… Oh all the work I did to clean my area up…

  19. M4CGYV3R says:

    I like this project. While the wire wrap one posted a while back was interesting this one has a much better interface and more in-depth explanation of construction.

  20. flapjackboy says:

    Orac? Is that you?

  21. thundergod says:

    Hey, I have the same box … use it for storing my cables though.

  22. Erik says:

    Yes, but does it run Linux >=)

    I have to say this is a very interesting project, and the only thing keeping me from doing something similar is the whole complexity of the wirewrapping or pcb design. But then again, I might finally have some spare time in the future to work out my ideas of a device like this.

  23. strider_mt2k says:

    That really is nice work!

    Clever, neat, and extremely well implemented.


  24. svofski says:


  25. DrF says:

    That’s some nice wiring, don’t think my hand would be steady enough for that.

    Good work :)

  26. 1000100 1000001 1010110 1000101 says:

    Simply outstanding

  27. nemo says:

    Awesome music and brilliant work!

  28. Fallen says:

    :D Amazing

  29. cantido says:


    Care to post a video of a CPU that you’ve designed directly from brain to PCB without any type of prototyping stage? Oh, you don’t have one? That’s a shame…


    Most of the logic he’s used is CMOS.. he’s used 74AC and 74HC series, there’s maybe one or two HCT (TTL compatible CMOS) gates in there.. IMHO it’s better to describe this as being built from 74 series logic rather than “TTL” logic.

    — other than that.

    Nice work

  30. blue carbuncle says:

    Congratulations! Great build! :)

  31. fartface says:

    Ahh a real hack…. Nice…

    The best part is all the N00b’s here claiming they can do that when in reality they cant.
    Mad Props and OOOOber Cool.

  32. Hirudinea says:

    Give that man the noble prize in hacking!

  33. Joe says:

    Yes, but can it navigate a landing craft on the moon? j/k :) Most awesome – I want one!

  34. rnay says:

    :) monkey !

  35. Igor says:


  36. Seth says:

    Heh, little Orac junior.
    All he needs now is to develop the smarmy voice synth and smartypants AI.

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