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

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

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

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.

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

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

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!!! 😁

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

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.

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

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)

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....

"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

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

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

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"

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.

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.

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

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."

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.

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

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

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

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

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

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

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

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

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

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

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

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.

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

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.

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

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

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

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

"Repository unavailable due to DMCA takedown."

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

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

The Github repository got a DMCA takedown

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

"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

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

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

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

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

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

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

You fixing the rotation table made me actually happy to see

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

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

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

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

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

I completely forgot I even subscribed, what a surprise.

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

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 😂

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

This is literally everything I've ever wanted! 😍

Love it; very impressive

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.”

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

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

This is so cool! dream to have this knowledge

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.

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.

That is so cool, I love it!

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.

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.

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

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

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

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.

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

damn, your learning so much!

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

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.

Please tell us about your education your educational back.. You are one of the greatest computer master i have seen on youtube. Bow down to the king.

This man has the dedication to do anything, Nice

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

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

17:54 nice music i love it

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

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.

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.

I love how he spends more time on building the OS than Tetris. I’m honestly impressed! Keep up the work JDH!

19:32 I’ve never seen someone compose by putting the note inputs into a script like this. It looks painful, but very cool! 😂

Ok, so, given the way this goes, the next video he's gonna say "I'm just too good for computers, so I made my own computer and OS, just to run pong"

This is honestly the best video I have watched in months! A perfect combination of coding, sarcasm and editing perfection!

1:33 And not even that will let us start tetris or anything that complex. Never have I emagind to hear tetris is complex. Amazing video LMAO

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!