Complete logic diagram for microprocessor.

Discussion in 'General Electronics Chat' started by llanders, Jan 6, 2015.

  1. llanders

    Thread Starter New Member

    Jan 6, 2015
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    Hi all.
    I'm working on a project and I was wondering if anyone knows where I can get ahold of a complete boolean logic diagram of a microprocessor. I need something that is shown at the gate level. I have found plenty of diagrams showing placeholders but that won't work.

    Thanks ahead of time!
     
  2. joeyd999

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  3. MrChips

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    [​IMG]
     
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  4. cmartinez

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    That's a pretty impressive diagram... the title "TV Typewriter II"... does it belong to a particular typewriter model, what year?
    Also, I see only seven bits at the buses shown on the left, is this a 7-bit microprocessor?
     
  5. MrChips

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    I just put this up because it reminds me of the worst digital schematic I have ever seen.
    It came out in 1975 as a kit which I helped assembled and still have the schematics. It is 7 bits because it takes 7-bit ASCII and displays it as text on a video monitor.

    [​IMG]
     
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  6. absf

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    Dec 29, 2010
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    Is this the one designed by Don Lancaster? Where can I get the BOM?

    Allen
     
  7. MrChips

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  8. absf

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    Sure, this is only for learning and educational purposes. If I want a TV text monitor, I would have done this atmega 4 chips design..

    http://sbc.rictor.org/vid3.html

    Allen
     
    Last edited: Dec 21, 2015
  9. MrChips

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    I do have a one chip design but I'm not ready to release it right now.
     
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  10. absf

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    No problem.:p I am not that greedy today.:D

    Using FPGA, I suppose?

    Allen
     
    Last edited: Dec 21, 2015
  11. takao21203

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  12. kubeek

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    Why do you need it? Maybe you coud take some HDL softcore and extract the boolean equations somehow.
     
  13. takao21203

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    Not entirely sure about that
     
  14. absf

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    Can get it from eBay but the prices would make you escape.

    http://www.ebay.com/sch/i.html?_fro...1313.TR0.TRC0.H0.Xkr2376&_nkw=kr2376&_sacat=0

    I think it shouldn't be too expensive to get a used Apple II keyboard from eBay or if your friend has an unused old Apple II, may be he's willing to trade it for a pizza. I heard that the Mac was made in Ireland and Singapore. Not sure about the AIIs.

    Allen
     
  15. takao21203

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    For what it does, its worth $1 or $2, and its fully obsolete. A PIC 16F59 could do the debouncing/code conversion in software, output signal = the same.

    If you really want a "TV" type writer, get a small TFT with video input, do it on a PIC32 in software.

    but maybe you want to use an old black&white TV set that costed nothing...in a Decade or so they will become quite rare and unusual. There are no new ones put on the market now, but analog video is still around (as input standard).

    RF modulators will also become more difficult to get- no longer needed for any purpose.

    By the way most of these old ICs are sold for precious metals processing, the payment is decided by how much gold they contain. I've heard recently gold bonding wire is replaced with palladium covered copper wire, so it wont be that lucractive anymore for new ICs.
     
  16. takao21203

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  17. sailorjoe

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    Jun 4, 2013
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    Landers, do a google search for "logic diagram of 4004". You'll see several sources for the 4004 (pronounced forty oh four) schematic diagram. The 4004 was a full four bit CPU in the '70's. It was the precursor to the 8008 and then the 8080 and on until today. Today's microprocessors have almost half a billion transistors. No one draws schematics for these; they use special programming languages to define the logic and the interconnects and even the details of the transistors. Get back to us if you need more help.
     
  18. spinnaker

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    Oct 29, 2009
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    TV Typewriter Cookbook?
    6502 Applications?
    Programming the 6502?

    One of those. They are on my shelf right now.
     
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  19. kubeek

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    The OP made this one single post and was last seen here in February.
     
  20. spinnaker

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    Gee thanks sailerjoe :mad:

    I should have looked too but it is 4:30AM here.
     
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