I’m genuinely impressed. This has to be the most exciting “building an OS” video I’ve ever seen since Terry Davis.

Fun fact: GIMP can export images as C code for situations like these.

My C programming class in 7th grade had me doing something a lot like the second half of this for our final group project. We just had a pointer to the start of video memory and a few very basic support structures like that, and the rest was up to us. I ended up writing most of the core layer, while the rest of the team implemented game features and made sprites and all that other stuff. I walked out of that class really knowing what programming was about, even if it took me a few more years to get a practical coding environment going for myself. Looking back, that teacher was one of the best I've ever had, in any subject. He was a huge follower of the socratic method, never handing us answers, but getting us to come up with them ourselves, or find them in documentation, while never letting us get mired in a dead end.

This video inspired me to start writing my own OS. As I’ve been writing I’ve been rewatching this and understanding more and more. I *just* started having this weird behavior and was like, “I bet I didn’t read enough sectors in.” Yup, that was it! Thank you for saving me a LOT of pain!!! 😁

"Bro, your computer is so slow, what OS is it using? Vista?" "Tetris." "...Huh?" "My computer is running on Tetris."

Next: "I went mining in a cave and collected resources to make my own hardware"

Me: - Let me check the code. Github: - Repository unavailable due to DMCA takedown.

Idea: You _can_ run applications, but to launch them you have to clear lines that correspond to positions on the taskbar

When he said: "So the cool thing is that it works for now and will only break when I’m about 20 more hours into this project and have completely forgotten about this code." I felt that....

Teach me your ways. You built everything from scratch, even the Tetris soundtrack lol. Next you'll be writing your own BIOS on custom made hardware.

This video never gets old! 2 days ago I finally got my bootloader to load and run my 32-bit C kernel and today, I got it printing to the screen properly. I have a long way to go and hopefully, I'll have my own version of Tetris running as well in the future!

I am truly impressed by this. I'm currently learning more and more code as the days go by (at least it feels that way). And seeing something like this really does make me motivated to keep pushing. I guess I gotta start doing some leetcode first though, to at least get those concepts in. (Mainly been doing webdev until now, so backend is kind of a new field for me)

"Hey bro can I borrow your laptop really quick?" "Yeah sure it's on the couch" "Thanks" tetris theme starts playing from the living room

Code Bullet : Makes the game and then makes the AI jdh : Makes the OS and then makes the Game

You are a brilliant and consistent man, I thought of creating a simple OS myself back in days when I was obsessed with writing things from scratch but couldn't do it because it is so much work and requires you to understand a whole lot than a normal programmer understands about computers. Your video gives the gist of what it needs to even write a very simple bootable software. Love your work man and thanks for sharing the Github code as it may help someone who is as cool as you.

Holly man... Outstanding skills! Respect for the effort and also result!!!

Just imagine the Tetris bootloader where you have to beat level 100 levels of Tetris to boot into your main OS.

"yeah i was bored so I made tetris" "oh that's nice" "yeah, but writing the filesystem was a pain in the ass"

From my very limited experience from writing memory manager for Nova (had to do it for uni) and some assembly (also for.uni) I admire how persistent you had to be to one man this. Had to take so much effort. Very cool

I am so mind blown by your videos. I have been watching them all day at work. How did you even manage to get to this point? I am about a year into my programming career and this just feels beyond my lifetime

OS: "what is my purpose?" jdh: "you load Tetris" OS: "Oh my god!" jdh: "Yes!"

I'm sad that you didn't take the genius opportunity to name it "TetrOS"

This video earned you a sub from me. I have been playing with the idea of building an OS that runs only one piece of software (I have my reasons), and your Github may just provide me with the inspiration to go through with it.

Beautiful. I wrote an OS for fun too (back in the early 2000s). It had a bootloader, never left Real Mode, and could display a command prompt, and that was it! I was incredibly happy when I put the image onto a 3.5" floppy and it actually booted on my machine (modern machines with UEFI instead of a BIOS would have been much harder). Then I proceeded to never look at it again and question my life choices.

jdh: _Builds an entire OS from scratch just to play tetris_ Me: _opens Stackoverflow:_ *How to center a div in CSS*

Next Video: "I realized that using an operating system to make tetris is sort of cheating, so I made my own computer without buying any of those cheaty parts and hardcoded tetris into it."

I really appreciate the way you kept spacing the code when it was a bunch of variables

"Repository unavailable due to DMCA takedown."

“Some people use cheats like a prebuilt universe but I don’t need any of that stuff”-Jdh 40567

your channel is so underappreciated, I have been watching since your first video and don't understand why your channel hasn't blown up yet. great video production quality, informative and just the right amount of humour. wait until the algorithm gods decide it's your time and your channel will blow up in no time.

This is similar to what we did for my 400-level computer architecture class. Only the system we were writing it for was based on a Motorola 68K chip. We had to write all the low-level hardware drivers and a simple OS kernel that tied it all together. The final involved booting it up and loading a program from a floppy disc that the professor gave us (yeah, we implemented a floppy controller driver). The program utilized every feature we had implemented to date to run a very simple (ascii) version of Tetris.

I binge you’re youtube videos while coding, i love you’re content man keep up the good work 👍

Well, can we just appreciate, that you did such a good job that Tetris Holding, LLC issued a DMCA takedown, good job

I like how he figures out the music to tetris by playing and listening instead of just looking it up

Thank you for the video, This actually gave me lot of an Inspiration to make my old laptop old game machine ! Love u dude !!! ...

Awesome nostalgic video! It reminded me what I build in my ~13-15, my own OS just not with Tetris but simple shell.

i didn't understand a word he said in this entire 20 minutes but i loved every second of it

Not only did he make the os and tetris, but he busted out the keyboard and figured out the harmony and melody instead of just checking musescore

20:49 "It was at this moment that he knew He fucked up" Seriously that's a huge pain for tetris enthusiast 😂

It's sad the source code got copyrighted ;-;

As a hobby OSdev I can say this is highly based, good job.

Next up: A collaboration with Ben Eater, because you two are basically going the same path just in opposite directions.

Github code repo is gone, just checked and thanks for the video. I can't draw with a pencil, let alone with the code. Your dedication and passion can't be matched. I never ever thought that I'd see an OS, from scratch, running an enterprise workload called "Tetris"

I learnt Java at uni last year as part of a softdev conversion course but have never looked at C before. I'm amazed how much I understand without ever having written or studied lower level languages. Thanks jdh.

This man is the kind of person who can flex on us but using the entertaining way

The Github repository got a DMCA takedown

Its a good thing you did not release this 18 days earlier :) - thanks for making the source available

That is totally sick you're a good programmer man I really like your videos. 👏👏👍👍

Dammn man, your github repository got actually DMCA'ed, this is insane

Can't believe there's someone out there who's still paying for a domain hosting niche documentation on 90's hardware.

I wish I had your knowledge, so many ideas in my head!

The world needs more of this guy, who still can write assembly

This is the most satisfying programming/game dev/vim/neovim video on youtube, i could watch this all day

"Look ma, no errors!" That is literally me showing my code to anyone

I don’t deserve a video this good, thanks. Great job.

This is the most inspiring video I have ever watch in KZfaq…….thnks for the effort…

I struggle to wrap my mind around how this is even humanly possible, man I'd spend months trying to create Tetris in Unity and this guy casually writes it in ANSI C while casually making a working bootloader, graphics driver, sound driver and all the rest of it

"This repository is currently disabled due to a DMCA takedown notice. We have disabled public access to the repository. The notice has been publicly posted. " WHY

You seem way too smart to be spending your time making this... Good job!

I just can't believe the fact that the repo got DMCA'd 😑😑

This is literally everything I've ever wanted! 😍

next: "I reprogramed the BIOS of my computer to only run tetris"

You fixing the rotation table made me actually happy to see

“I’m not trapped in a sub” oh boy that did not age well

When I started coding I thought using libaries was some sort of cheating, as I basically just ran someone else's program which I couldn't write myself. This guy took that thought to a whole nother level

I completely forgot I even subscribed, what a surprise.

After all this the repo gets a DMCA takedown : ( Was really hoping to take a stroll through the code

17:54 nice music i love it

This is the person who's going to make those computers you see in Fallout.

i only understand Java and C# but this was still extremely interesting, seeing a genius create an operating system

This is so cool! dream to have this knowledge

I wish I was this capable! Impressive work!

“I don’t think Tim Apple would like me booting this on his hardware.” That’s code for, “I have no idea how to get a Mac to boot something other than MacOS.”

As someone with no assembly knowledge, this whole video was a bizarre combination of surreal, confusing and inspiring. I kinda wanna learn assembly now.

Wow, in awe. Watching and listening to a genius at work.

I am really impressed but you destroyed my eyes ! I was watching your video at 00:26 and while i was watching i came up to the minute 8:30 in the video and the white bright screen blinded me 😂

Dude this guy made an operating system in a month and I can't even figure out data-orineted design in that time. Where did you learn to program? I'm mega jelly about your skills at all things programming.

ah yes, building an OS. i did this for my raspberry pi, wrote a custom OS so that I could make a robot run easier with it, forgot to backup the ISO, and the sd card broke causing me to lose 4 months of work. good times.

This sounds like it could be a fun project for learning the basics of bare metal programming. Time to do this in Rust!

You can use group theory to rotate the tetraminos. A rotation is a combination of orthogonal and diagonal reflections.

Bro. I'm over here with a case of depression caused by c++ and a project that's taken about 8 hours so far. I could never do what this man just did.

This project is so needlessly hard and complicated but at the same time so beautiful to watch. Must have felt _so_ satisfying to see through this project after all the pain that went into making it. This I aspire to become as a junior dev.

Damn, this man just says my thoughts out loud and I appreciate it

I did a few assembly based graphic demos back in the day on the SoundBlaster and vga, but i wasn't that big of a mosaicist to create a basic OS to go with it!

The Next box isn't just for "fancy new versions." It was literally present in the original Electronika 60 version in 1984. That's before the game had sound, color, or even a price tag.

really impresive. I feel like I only saw a fraction of the hard work, that went into this. great job

This is the pinnacle of KZfaq right there! Aspiring to say the least

I actually just did this a while ago in ASM and did it all in ASCII and at the bootloader level. Just wanted something to screw around with and it's super incredibly small 🤙

This is my second video I've watched from you in as many days. I'm still floored and my mouth is still gaping at your skill lvl. Shows the amazing work one can do when you hack a system. Great job dude.

One more thing you can add is the Tetris bag randomizer where the seven unique pieces are shuffled and outputted as a group repeatedly. Three T pieces coming out of the first four was surprising. awesome video

"Please don't copyright strike me for the music EA" *Repository unavailable due to DMCA takedown.*

This man has the dedication to do anything, Nice

As someone who has only really used high level languages this is incredibly fascinating, all your videos are great and I hope the KZfaq algorithm would favour your channel more. Awesome content

This got you a subscribe from me. I've never seen anyone just write assembly like other people write "normal" code. I used to write assembly on my old BBC and I was constantly having to look everything up all the time.

Love it; very impressive

Well it was actually worth the DMCA. Great work dude!

I'm convinced he just found an excuse to show us his masterful Tetris skills.

I felt that *_sigh_* on a spiritual level. One character bugs are the bane of programming. This video is actually insane, keep up the good work.

damn, your learning so much!

I remember games that booted directly from their floppy and didn't need DOS, so the BIOS allows you to run complex stuff without an OS. An example could be Digger. I wouldn't know where to start to even analyze it because I remember the disk couldn't be read in DOS, I couldn't do DIR, even trying to acces the unit gave an error like the disk wasn't even in a normal format. So I don't know if the thing had files, if it was an exe or a com executable, or if it was "a thing", like a signal, like games on tapes for spectrum or c64 or what. Years later I ran into a converted version of Digger that was a normal EXE for DOS, but I'm still curious about how that kind of games worked. Anyway, I think it would be very possible to code Tetris to "just run without a OS", but I don't have a clue. Maybe there's some ASM or C compiler out there that lets you build some autorunning "thing" that is not even an EXE. My guess is it would be the same kind of "file" DOS or NT runs to boot. I mean, if the BIOS looks for a "runme.bin" thing after doing its checks, a self booting no OS game would be a "replacement" for that "runme.bin", the computer wouldn't know the difference. wait, after watching the video, I'm not sure if you did exactly what I mentioned, a game that self boots and just runs, or if you made an OS layer. and now I'm wondering of those self booting games like Digger were the same thing you did here or not. btw: congratulations on your skills, it's amazing to see you do stuff. I can do stuff on C for DOS using Borland's Turbo C, or best case scenario DJGPP with the Allegro libraries hehehe, I never learned more advanced stuff. I can't even code for Windows. and I don't mean modern Windows, I never learned to code even for 16 bit Win 3.x, let alone win32 for 9x or NT. I found it too complicated, too hard, I couldn't wrap my head around programming for Windows. let alone programming for no OS at all and having to code everything from scratch yourself!. like "dude... no file system???!!! how do you do things without files?? this is insane!!!" hahaha.