MiniWin Desktop OS

A miniature graphical desktop operating system written in x86 assembly.

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Features

• 320×200 256-color graphics mode
• PS/2 mouse driver
• Crosshair cursor + double buffering
• Status bar showing coordinates
• ~45 FPS

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File Structure

MiNiWin--DESKTOP--OS/
├── bin/
│   ├── boot.bin          # Build artifact
│   ├── kernel.bin        # Build artifact
│   └── os.img            # Bootable image
├── src/
│   ├── boot.asm          # Boot sector
│   ├── kernel.asm        # Kernel entry (only `%include "stage2.inc"`)
│   └── stage2.inc        # Desktop system implementation
├── tools/
│   ├── build.sh          # Build script (Linux/WSL)
│   └── STARTOS.BAT       # One-click launch (Windows)
├── LICENSE
└── README.md

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Build and Run

Windows

Double-click tools/STARTOS.BAT

Prerequisite: bin/os.img must already exist. On first use, run tools/build.sh under Linux/WSL first, or use the bin/os.img bundled with the package.

Linux/WSL

cd tools
chmod +x build.sh
./build.sh

The script will automatically compile, package bin/os.img, and ask whether to launch QEMU immediately.

Manual Build

nasm -f bin src/boot.asm -o bin/boot.bin
nasm -f bin -I src/ src/kernel.asm -o bin/kernel.bin

dd if=/dev/zero of=bin/os.img bs=512 count=2880
dd if=bin/boot.bin of=bin/os.img bs=512 count=1 conv=notrunc
dd if=bin/kernel.bin of=bin/os.img bs=512 seek=1 conv=notrunc

qemu-system-x86_64 -drive format=raw,file=bin/os.img

Note: src/kernel.asm contains %include "stage2.inc", and NASM will expand stage2.inc into it during assembly. Since stage2.inc and kernel.asm are both in the src/ directory, you need to add -I src/ to specify the include search path when compiling.

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Dependencies

• NASM
• QEMU (for running)
• dd / certutil (for packaging)

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License

MIT License

Copyright (c) 2026 SimpleToolsStudio

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.