PyCoreOS

[blazing timber]

PyCoreOS is a hobby OS project I started in January 2026.  The initial development was at a snail's pace and I completed the Memory Manager in February 2026.

I have added

• A multi-privilege level preemptive scheduler.
• An initramfs root fs.
• About 30 system calls, most not that interesting and not much different from each other.
• Multiple mountpoints in the VFS

DOOM - The Currently Completed Most Impressive Work

The coolest thing I have done so far is port DOOM (Linux version 1.10) to run natively in ring 0. still no sound 🙁

• The C source (57 files) is statically linked into the kernel.
• It renders into an internal 320x200 buffer and software scales to the system framebuffer.
• Full PS/2 keyboard support with scancode support.
• Software synthesizer for music (MUS) and SFX, mixed into the kernel’s audio buffer.
• WAD files are mapped using a POSIX compatible shim from GRUB multiboot modules.
• I updated scripts/build.py to build/link DOOM files into the kernel image, and resolved all undefined references.

TODO:-

Get APIC/SMP (Symmetric Multiprocessing) working, to use multiple CPU cores.

Github:- https://github.com/pycoreos-dev/PyCoreOS

[sly ravine]

very interesting

user-oriented?

also get your gh links should go here

[blazing timber]

noice!

[compact needle]

2 months?
how 😭
I'm at 3 months already and I'm still on getting apic working

[blazing timber]

insane 😭

thanks for the support

everything ring 0?

nope only doom runs on ring 0

rn i am trying to implement a a consistent, friendly GUI for all apps, including smooth rounded corners, shadows, and hover animations; the ability to resize, drag, and close (the “X” should minimize to a taskbar with icon previews); hehe

[sly ravine]

2 months for the project is insane (feature-wise)

[blazing timber]

updated the desktop a lil bit :

[sly ravine]

damn

thats something

though just a note, focus on the internals sometimes

[blazing timber]

insanity

how is this possible in 2 months 😭

every weekend i had dedicated like 5 hrs to this thing

[sly ravine]

thats very short

[blazing timber]

short asf

i code 8 hours a DAY

btw this used to be a older project called QuestOS

that in started frm like 2024

that failed real bad

this os has the same source code kinda since i rewrote it

also no repository ?

nope

i have no idea hwo to make a repo

make one if want it open source

[blazing timber]

learn git

with Mit licence right?

how it works

[blazing timber]

yes if you want to give 100% freedom over your code

yea ppl can make chnages to this os as they like

sure then

[sly ravine]

thats already a not so great mindset if you are planning to do sth a bit of more serious

[blazing timber]

oh?

[sly ravine]

yes, since as they like can break your kernel

[blazing timber]

ohhh so like sm rights over the os but not full ?

[sly ravine]

no actually

what here is actually committing to the main branch

which is yours

everyone is allowed to fork (make their own version)

however they like

but the thing is keeping your OWN clone

fresh

and not accepting every merge from any forks

[blazing timber]

ohhh that even better

[sly ravine]

if you choose MIT, people can basically do anything (beside blaming you ofc)

including commercialize it and amke billions and you got 0 cents

thats also why more powerful, copy-left license exist

namely GPL

for example the linux kernel is licensed under GPLv2

and XNU is APSL

apple public source license

[sly ravine]

xnu (or part of darwin) is the kernel for many apple oses

[blazing timber]

great imma make my repo thx for this precious info

[sly ravine]

np

also which platform

github, gitlab or codeberg?

[blazing timber]

github

[sly ravine]

i really wanna see the source ngl

[blazing timber]

u mean QuestOS?

[sly ravine]

no the current one

and also QuestOS

[blazing timber]

idk if i can upload it here on discord

cuz ~25mb

[sly ravine]

compress?

[blazing timber]

imma put it on github

[sly ravine]

thats what to do

[blazing timber]

can sent the link is that okay?

[sly ravine]

oh yeah totally

people actually expect a link from the first message of the thread

[blazing timber]

imma edit that then

[sly ravine]

got the repo yet @blazing timber

[blazing timber]

Making the readme.md

[sly ravine]

cool

[blazing timber]

progress:

[sly ravine]

hmm

that should be in build steps

the readme is usually not just for build steps

[blazing timber]

so like a description of it?

[sly ravine]

yeah

this is my entire readme

[blazing timber]

oh thx for the reference

here is the link "https://github.com/pycoreos-dev/PyCoreOS"

[sly ravine]

upload?

learn how to use git soon

[blazing timber]

okay

[sly ravine]

the build system is insane

this is not a kernel shell again

[blazing timber]

KERNEL SHELL?!

[compact needle]

short asf i code 10 hours a day but only debugging and not actually adding anything 💔

[blazing timber]

same for me sometimes like rn 💔

[compact needle]

im just watching others debug lol

[balmy venture]

Your OS is so good! Keep going!

[blazing timber]

UPDATE :I transitioned from manual file uploads to a proper Git workflow by initializing a local repository, linking it to GitHub, committing my project as a clean root snapshot, renaming the branch to main, and force-pushing to overwrite the remote history so my WSL PyCoreOS directory became the authoritative source.

also updated the OS to use rings

[sly ravine]

as usual i think this project should be using limine

[blazing timber]

u mean the bootloader limine?: https://github.com/limine-bootloader/limine.git

imma try implementing it

[sly ravine]

yes

also how you test your os with qemu right?

note to also try vmware, vbox and bochs

and real hw (using CSM)

[blazing timber]

okay

can i do it in liek 4 hrs

cuz i do have an exam to attend to rn

i promise to work on it after

[sly ravine]

cool

using limine is better than mb2

very good starter pack

[blazing timber]

okay

[sly ravine]

but also

[blazing timber]

?

[sly ravine]

i highly recommend you fix the build system

raw python is not a build system

the current script offers NO flexibility

makefile is just there to run the script

[blazing timber]

so u want me implementing both of these into the makefile?

[sly ravine]

no like

do it properly

either makefile

[blazing timber]

okay later

[sly ravine]

or a python-based build system

just point that out

[blazing timber]

rn i need to run

[sly ravine]

ok, ill note and just read later

when you have time

you can use Makefiles

SCONS (if you want python)

or Meson

but i personally prefer CMake

[blazing timber]

python build system is crazy

[sly ravine]

well

it can sometimes be nice

but this is not

here

https://github.com/pycoreos-dev/PyCoreOS/blob/main/scripts/build.py

[blazing timber]

updated the bootloader to limine and it works on VirtualBox ,qemu and my old Lenovo ThinkPad x390

could sm1 implement audio to this

i already pulled my hair out trying to do soo

[sly ravine]

please learn how to use gitignore

[blazing timber]

yep forgot abt

that

[sly ravine]

your project will took 1000 years to clone if you keep it this way

[blazing timber]

Just use .gitignore 😭

[sly ravine]

the thing is

even if you use gitignore

you already made tye damage

to the tree

[blazing timber]

Yes

mahn

[sly ravine]

so unless you use --depth=1

git clone time will explode in no time

[blazing timber]

great my pc is like already cooked

now this

[sly ravine]

what?

[blazing timber]

yea kinda

the screen is like fractued into 4 pieces

[sly ravine]

about the build systen you switched from make -> raw python to scons -> makefile!?

[blazing timber]

both

[sly ravine]

any screenshots

[blazing timber]

scons is an altrnative methord

[blazing timber]

mb rn i ain't at home

imma sent after i come

[sly ravine]

wow, the iso size is 13M

[sly ravine]

just why??

[blazing timber]

idk mahn u told me to switch

[sly ravine]

i give you options

and choose one

[blazing timber]

the thing abt me is i might mess up smgt and have 15 hrs to debug

[sly ravine]

i never use and, i use or

though the gui is insane

but sadly, this is an os-in-kernel

most straightforward type

[blazing timber]

No userspace?

[sly ravine]

there is

but what you see on screen is not in it

[blazing timber]

[sly ravine]

and the kernel is like a game

its main loop is baked with compositor draw

net poll

and cli handling

[blazing timber]

insane

[sly ravine]

maybe this better suits at a simulator

hmm

i think thats actually not a bad idea

[radiant juniper]

got doom in 4 days lmao

still a good project

i like it

[sly ravine]

doom isnt too complex to port

[fallen bloom]

Cursor, Claude Cod, etc..

[fallen bloom]

Firstly don't commit build files.

Secondly, unfortunately it's AI generated.

[fallen bloom]

vibecoded-os-in-kernel

[sly ravine]

really?

me and @blazing timber is trying to find yesterday

and no success

[fallen bloom]

Just browse through the repo.

The doom files are so obvious

[sly ravine]

doom?

i though its a doom port

not even a port

just gluing

i only looked at kernel sources

OOHH

[radiant juniper]

i did not mean porting doom, i meant i made a scheduler, a pmm, a vmm, an elf loader, rw filesystem AND ported doom in 4 days

made an os that can handle doom in 5 days

idk how to explain

[sly ravine]

quite something then

[radiant juniper]

5 days for playable doom and 2 days for 0 fps doom

not very proud, i just copy pasted most of the internals from otos

but porting newlib was from scratch

if all that was from scratch, this would have took me a week or two lmao. im a fast writer when i actually want to work

anyways sorry for offtopic

[fallen bloom]

I'm sorry but no, if you would have started from scratch it would have taken far longer than that. You need to research, have some iterations, bugfix-

The only possible way to do that is with AI.

You didn't use AI you just copied OTos which is also possible

Copying stuff from other OS's..

[radiant juniper]

otos mine so i have all rights lol

[fallen bloom]

idc lol its your os

just that you cant claim that you can do all of that in five days without using some sort of AI.

or copy from others

[radiant juniper]

i just reused otos code, like a ton. Only new thing was the new newlib port because i used too much ai in the otos port

no ai, by the way

[fallen bloom]

well porting newlib in a week is doable

but why newlib

anyways this is offtopic

[rigid knoll]

what happend here?

[sly ravine]

vibe-coded os-in-kernel

[rigid knoll]

is that good or bad?

this is the github repo btw

[rigid knoll]

that must be a pain in the ass to compile and run since its ai generated code?

[sly ravine]

idk

[sly ravine]

he retreated

[rigid knoll]

ohh

[sly ravine]

too bad i don't have the repo

i deleted it

[rigid knoll]

then why is this post still online?

[sly ravine]

after seeing the insane build system

[rigid knoll]

what was it?

[sly ravine]

his remnants are still there

[sly ravine]

SCons + Makefile parallel

[rigid knoll]

damn

[sly ravine]

it used to be raw python and makefile

which was even worse

[rigid knoll]

The gui looks good and also doom u sure he used AI?

[sly ravine]

the os have doom in days

[sly ravine]

bruh

AI are designed for webapps

*at least whats its not suck

[rigid knoll]

so he did use ai?

[sly ravine]

likely

the 5.5KLOC compositor is comment-less

and the doom glue contains quite obvious traces

[rigid knoll]

comment-less? he might have removed them

[sly ravine]

i mean why would you remove your own comments?

[rigid knoll]

again if he was using AI to make this

then he might not want to be get caught

so he removed them

[sly ravine]

but he is being get caught

[rigid knoll]

and when he did got caught then he did remove everything and left

[sly ravine]

and thats what a normal person would not (likely) do

[sly ravine]

no?

when he removed it

its a red flag

initially no one thought this is vibe coded

[rigid knoll]

then i am 95% sure it is ai

since he deactivated or deleted his account

see more proof

[sly ravine]

yeah

[misty hedge]

At this point I’ll just admit when something is fully AI

[rigid knoll]

waste of everyone's time

[sly ravine]

true

[misty hedge]

I kinda liked his UI

Looked pretty

[sly ravine]

though im quite impressed by the ui

[sly ravine]

true

i wonder how much tokens

[rigid knoll]

he is likely the no 1 guy who caused the ram shortage

[misty hedge]

Claude is honestly the best for programming, but programming a full OS in Claude on a 20 dollar plan would still take over 4 months because of tokens and how precise you need to be with everything

[sly ravine]

fact

[misty hedge]

I’ve used Claude to fix some issues… and used Codex to help me start.

Though don’t make an OS with ONLY AI

Because where’s the fun in that?

[sly ravine]

im not hostile against ai

just dont make slopware

[rigid knoll]

imma do the same

coffeeOS

or smgt like that

[misty hedge]

For my start, I used Codex to make my interpreter and compiler for my programming language, I designed my language myself. Then I… used AI to make the boot sectors, and to set up MINIX V1 and helping me out with my existing TRAPS design. Though things like the CLI, my memory allocator, and other stuff were quite easy to do myself

I’ll replace the AI bits in the future

[misty hedge]

Just gotta be careful with how you prompt, Codex ain’t that good with OSes

[rigid knoll]

ohh thax

*thx

[sly ravine]

cool

does it comes with a pack of sugar

[rigid knoll]

nah black coffe

[sly ravine]

so a pack of caffeine

[rigid knoll]

kinda but with AI

[sly ravine]

what

[blazing timber]

Never judge a OS by it's aesthetics

[rigid knoll]

to debug chill not like that guy

[sly ravine]

#MellOS

[sly ravine]

do you currently have a project?

@blazing timber btw they actually doesnt use the channel

[blazing timber]

what channel?

[rigid knoll]

nopr

[blazing timber]

oh #1461674570846175417 ?

[sly ravine]

yeah

was enjoying my meal