Mezereon OS 🌿 v0.5.3-AeroAcumos

Mezereon is a modular hobby operating system designed for legacy x86 (386/486) and SPARC hardware. It focuses on stability, hardware discovery, and providing a modern development experience on classic chips.

🚀 Key Features

• 📺 Graphics: Robust SVGA support for Cirrus Logic (AVGA2), Tseng ET4000, and SMOS SPC8106 (Compaq Aero).
  • New in v0.5.3: High-speed 32-bit VRAM sync for ISA cards and full-height 640x480 console support.
• ⌨️ Input & Control: PS/2 Keyboard support and a fast, bi-directional Serial Shell (115200 8N1).
• 🌐 Networking: Integrated TCP/IP stack with NE2000 (ISA) support and a built-in HTTP server.
• 💾 Storage: ATA PIO (LBA28) driver with NeeleFS v2 (Read/Write filesystem).
• 🔊 Audio: PC Speaker beeps and SoundBlaster 16 (SB16) driver.
• 🏗️ Architecture: Features a Unified Driver Model (UDM) and Hardware Abstraction Layer (HAL) for clean, modular hardware support.

🛠️ Quick Start

1. Build the OS:

   make

2. Run in QEMU (Graphics):

   make run-x86-fb

3. Run in QEMU (Serial Console):

   make run-x86-hdd

🏛️ Legacy Hardware Optimization

Mezereon is specifically tuned for real 386DX/486 systems:

• Shadow Buffering: Minimizes ISA bus bottlenecks.
• Memory Safety: Kernel and buffers are carefully placed to avoid clobbering BIOS/EBDA.
• Text Mode Recovery: Guaranteed clean return to the shell after exiting graphical apps.

📂 Project Structure

• drivers/gpu/: Hardware-specific SVGA drivers.
• net/: Minimal TCP/IP stack.
• apps/: Built-in demos like rotcube (3D) and keymusic.
• docs/: Extensive documentation on kernel internals and hardware.

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Crafted for the silicon of yesteryear. 💎