Building the 8-bit computer in software

• iverilog

  11 2,627 9.6 C++

  Icarus Verilog

As the idea was to make it more realistic, I started by making (hopefully accurate representation of) 74-series logic chips in Verilog. Then wired them into higher level modules, and merged those into complete CPU. Runs quite good in Icarus Verilog.

• 8-bit-CPU

  11 10 9.0 Python

  Homebrew 8-bit CPU

I wrote an emulator for my CPU in Verilog. Actually, I made it to test out various aspects before building, real hardware has not yet cached up with it.

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• Digital

  84 3,954 6.9 Java

  A digital logic designer and circuit simulator.

I've been testing my logic designs for the 6502 computer in https://github.com/hneemann/Digital which has a bunch of 74xx logic defined already. I'm not sure if it'll take you all the way to the 8-bit build since some of the more esoteric 74ls chips may be missing, but you can build that stuff out of gates.

• logisim-evolution

  25 4,307 9.4 Java

  Digital logic design tool and simulator

  

I've used Logisim a bit in the past. I liked it. I also see that there's a "Logisim Evolution" project on Github https://github.com/logisim-evolution/logisim-evolution

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