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Tracking mentions began in Dec 2020.
could someone please help me build a circuit for this truth table 🙏
2 projects | /r/AskElectronics | 4 Mar 2023
The Digital application can generate a circuit based on a truth table. An example...
Logic Gate Simulator
3 projects | news.ycombinator.com | 10 Feb 2023
I cannot recommend Digital enough: https://github.com/hneemann/Digital
It is quite new. Clearly inspired by Logisim but not derived from it.
It has support for switches like FETs and relays, and you can implement open collector logic with pull-up resistors.
It can analyze and reduce combinatorial logic. It can generate Verilog and VHDL output from a diagram. And, IMO best of all, you can implement individual components in Verilog/VHDL and plop them as graphical elements in your circuit; when you simulate, it will fire up iverilog or ghdl in the background.
It's fast too; one of the demo circuits is a complete processor and it simulates it at around 300 kHz on my machine.
How a CPU works: Bare metal C on my RISC-V toy CPU
4 projects | news.ycombinator.com | 26 Jan 2023
I have been building a CPU using: https://github.com/hneemann/Digital
Much faster than Logisim, UI a little clunky, but my CPU runs around 0.5Mhz and it has very nice peripherals like Telnet, graphics ram, VGA etc
Terrible name that is hard to google, but great tool.
Digital Logic Sim
2 projects | news.ycombinator.com | 31 Dec 2022
Should you want a digital logic simulator that's not a game, check out https://github.com/hneemann/Digital.
fpga for kids
2 projects | /r/FPGA | 14 Nov 2022
Take a look at https://github.com/hneemann/Digital
My new 65816 Computer, very proud!
3 projects | /r/electronics | 20 Aug 2022
as for designing, i used Digital to create the circuit and export it to Verilog, then Quartus II to synthese it for the MAX7000 series of CPLDs (because they are perfectly compatibile with the ATF150x series), then used POF2JED to convert the generated POF file into a JED file, which can finally be used in ATMISP to load onto the CPLD.
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!
3 projects | /r/factorio | 7 Aug 2022
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)
I Designed My Own 16-Bit CPU
3 projects | news.ycombinator.com | 28 Jul 2022
Well logisim is dead, but evolution is a fork and then there's Digital https://github.com/hneemann/Digital which is I think a reimplementation of Logism's concepts?
I also hand designed a custom 16 bit CPU in logisim, because I was struggling to understand Nand2Tetris's HDL as well as I liked, and also because I stopped following the curriculum to go my own way.
features you wish logic gate sims had?
2 projects | /r/beneater | 10 Jul 2022
Digital https://github.com/hneemann/Digital exports to VHDL.
Vending Machine - FPGA
4 projects | /r/electronics | 1 Jul 2022
and finally, if you're like me and gotten waaaaay too lazy to write actual Verilog/VHDL by hand, then Digital is for you.
What are some alternatives?
logisim-evolution - Digital logic design tool and simulator
Logisim-Dark - A fork of Logisim with a Darcula-like look and feel
logisim-evolution - Digital logic designer and simulator
OpenCircuits - A free, open source, online digital circuit/logic designer.
mooc-java-programming-i - University of Helsinki’s free massive open online course (MOOC) completed exercises. 2020 solutions
jdh-8 - An 8-bit minicomputer with a fully custom architecture
customasm - 💻 An assembler for custom, user-defined instruction sets! https://hlorenzi.github.io/customasm/web/
ghdl - VHDL 2008/93/87 simulator
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]
iverilog - Icarus Verilog
8-bit-CPU - Homebrew 8-bit CPU