logisim-evolution
8-bit-CPU
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logisim-evolution | 8-bit-CPU | |
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25 | 11 | |
4,232 | 9 | |
4.4% | - | |
9.5 | 9.0 | |
7 days ago | 4 months ago | |
Java | Python | |
GNU General Public License v3.0 only | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
logisim-evolution
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A circuit simulator that doesn't look like it was made in 2003
Logism evolution works great and is quite modern.
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Ben Eater's 8-Bit CPU in Logisim, Plus More!
Here is the link for Logisim Evolution: https://github.com/logisim-evolution/logisim-evolution
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Crumb Circuit Simulator
In school, I worked on an introductory CS/EE class many, many moons ago, and I believed we used something like "logisim", which by then was pretty awesome - you could build simple things like adders, combine those with "macros" to bui;d ALUs and then whole simple CPUs.
Since then, the logisim project has discontinued, but it looks like there is a open source successor:
https://github.com/logisim-evolution/logisim-evolution
Have not tried it, but it looks promising, provided you don't want to do too complicated things (not sure if you could really model complex CPUs like a pentium with it). Also, it's pretty digital only, so I wouldn't expect Mac-Spice-like analog circuit simulation.
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I was making adder circuits in games 8 years ago in an attempt to build a computer. I finally worked my way up and built a working computer!
though i'd heavily recommend first building the circuit in a logic simulator like Logisim, or Digital before trying to build it in a game for an FPGA. (Digital even allows you to export circuits as Verilog/VHDL, and as a certified lazy person, that is very useful)
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Embedded Systems Weekly #112
Logisim-evolution An alternative free and open-source tool to design and simulate digital logic.
- Logisim – A Graphical Tool for Designing and Simulating Digital Logic Circuits
- I Designed My Own 16-Bit CPU
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features you wish logic gate sims had?
Logicism Evolution also does HDL and can export directly to several common FPGA boards. https://github.com/logisim-evolution/logisim-evolution
- Best logic gate simulation / digital logic circuit software? (best if cross platform.)
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Building the 8-bit computer in software
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
8-bit-CPU
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Ben's 8 Bit Computer in an FPGA
I wrote an emulator for mine, then extended it to test out different designs, before building on hardware. The approach was a bit different, as I started by implementing 74-series logic chips. Then "wired" them together into CPU modules. This way emulator becomes a testable representation of what's possible using logic chips.
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Building the 8-bit computer in software
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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My 8-bit cpu running at full speed
The source code was in Python. I was able to debug it using Arduino-based adapter and (by using some "magic") translate into machine code binary. Since then I've switched to CustomAsm for code compilation and have other means to debug (emulator and debugger tool).
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Possible Alternative to EEPROM programmer?
If you looking for examples: here's how you create the array (code generated using xxd -i command), and here's how you use the array.
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Fully automatic boot loader for the 8-bit CPU?
In the beginning of program (on EEPROM), there's a small piece of code that reads all 256 address locations and writes them back. In BOOT mode, this effectively copies contents from ROM into RAM.
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If the manual says, never power Teensy from the USB and from Vin at the same time ..................................................................
Complicated? Perhaps, but do not underestimate the power of automated testing! When you can run a couple dozen tests in just few seconds, at any time, it really gives you confidence about the system. Obviously, one should spend time writing the tests, but it pays back rather quickly.
What are some alternatives?
Digital - A digital logic designer and circuit simulator.
logisim-evolution - Digital logic designer and simulator
32-bit-RISC-V-Cpu-Core
iverilog - Icarus Verilog
RISC-V-Computer - An enhanced yet simplified version of the original RISC-V-Computer build with Logisim [Moved to: https://github.com/MazinCE/RVCOM2.0]
ghdl - VHDL 2008/93/87 simulator
gtkwave - GTKWave is a fully featured GTK+ based wave viewer for Unix and Win32 which reads LXT, LXT2, VZT, FST, and GHW files as well as standard Verilog VCD/EVCD files and allows their viewing.
Logisim - Logisim Italian Fork
rv32i-logisim-cpu - Implementation of RV32I in Logisim-evolution.
logisim_evo - A collection of Logisim Evolution circuits
MIPS-CPU - A Simulative MIPS CPU running on Logisim.
rars - RARS -- RISC-V Assembler and Runtime Simulator