Digital Logic Sim

Sebastian Lague · 2025-04-17T21:58:52Z

Hi everyone, I was thinking it might be fun to have a playlist on youtube to showcase different things that people have built in the simulation. So if you have something you want to share, just upload a video to yt and drop the link here. Don’t worry about it having to be super elaborate or anything, I think it’s cool to see a variety of projects, both small and large. There’s also no time limit to this — I’ll check back every so often and add any new entries to the list :) If you want to check it out, you can find the playlist over here. (By the way, I’m also planning to show some of these in a video — most probably at the end of my digital logic series. That’s still quite a while away, but I’ll link that here as well once it’s eventually out).

A minimalistic digital logic simulator · By Sebastian Lague

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A topic by Sebastian Lague created Apr 17, 2025 Views: 11,340 Replies: 101

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mukhash_x861 year ago

My own CPU named "N-16" executing Fibonacci sequence (23 Numbers and one overflowed number)

curlymons1 year ago

I made a 4-bit CPU for fun here, it just needs RAM but other than that it works pretty good.

( Sorry for the bad video quality, I saved it in 1080p but idk what happened here haha )

Crosbyman641 year ago

Your video quality is fine, it just takes a while for the higher quality part to finish processing.

For the XOR chip, you can actually make one using only 4 NAND chips: the first NAND is connected to both inputs, the second is connected to Input A and the output of the first NAND, the third is connected to Input B and the output of the first NAND, and the outputs of the second and third NAND chips go into the inputs of the final NAND, and the output of that is the final output.

curlymons1 year ago

Yes I actually know that, but that was only after I finished the CPU haha ! :D

Crosbyman641 year ago

I'm making Tic-Tac-Toe in DSL.

Yes, you read that right, I'm making a fully functional Tic-Tac-Toe game in Digital Logic Sim. I got the input part figured out. Here's a sample:

fishnotfound1 year ago

I am amazed yet scared of what people can do with a game that seems so simple

Sava330 days ago (2 edits)

Really fast CPU with an assembler and Snake. I was working on it for over 50 hours total and made it easy to write new programs for.
You can download it here: https://github.com/Sava-thecoolone/BETTER-CPU

NeevorPL201 days ago

MOS 8501 Replica

wjr614198 days ago (3 edits)

I made a very traditional CPU with the worst wiring mankind has ever seen.
CU has 16 hard wired opcodes: No-Op, load, store, add, subtract, and, or, jump, jump if zero, jump if carry, load literal, output, input, halt, add literal, subtract literal. Memory is limited but with a lot more it could do a lot of cool stuff

421Dungeon139 days ago

i made a 32x32 display with colour offsets that runs extremely fast

421Dungeon134 days ago

first 128x128 20khz display??? also sorry for the spam seb i got really interested all of a sudden and kept creating higher and higher resolutions

LucasBe323 days ago

Hi Sebastian, thanks a lot for this sim! I built an 8-bit CPU in it, running at 800 kHz with 16-bit addressing and 64K of RAM. It runs a small OS with Snake, Breakout, Flappy Bird and Tetris, all playable live with the keyboard. To avoid typing the programs in binary, I also wrote my own language and compiler.

Gabriel Kirklin11 days ago

12 Hour Digital Clock with set and clear for minutes and hours , Blue for AM and Red for PM

Viewing posts 41 to 53 of 53 · Previous page · First page

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Digital Logic Sim

YT playlist for community creations Sticky

first 128x128 20khz display??? also sorry for the spam seb i got really interested all of a sudden and kept creating higher and higher resolutions