4Bit CPU in Logisim

Discussion in 'The Projects Forum' started by turtlebite, May 4, 2015.

  1. turtlebite

    Thread Starter New Member

    May 4, 2015
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  2. absf

    Senior Member

    Dec 29, 2010
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    If your logisim supports all the chips in table 3 of page 5 of the pdf file. You can most probably simulate it on the simulator. you also need a way to program the TTL PROM 74S289 in your simualtor.

    I checked with my proteus and found that 74LS181 was in the library (what a surprise) and probably it can be sim in proteus.

    Allen

    [edit] Oops sorry. 74S289 is TTL static RAM. It should be 28C17 that you need to find a way to program it.
     
    Last edited: May 4, 2015
  3. WBahn

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    Mar 31, 2012
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  4. turtlebite

    Thread Starter New Member

    May 4, 2015
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    Hi

    Thanks for the replies! I need a simple circuit to study so I can program a simulation of it. Unfortunatly I'm more a programmer and not a circuit builder so I will loose too much time until I understand all the pieces and put it together in Logisim. Because I only have time until the end of August... So maybe I will try to build something simple from scratch in Logisim. Is here the place to get advise? Can I upload a .circ file for you to look at?

    Thanks!
     
  5. absf

    Senior Member

    Dec 29, 2010
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    Looking at the PDF file again, I see that only a block diagram is attached.

    There is no detailed schematic included for the computer. Where does the "clock" from 555 timer goes to? On the breadboard, there is a big chip called "CONTROL" and it was missing on the part list too. You have to study the document in more details before you start to simulate it.

    Allen
     
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