The legendary operating system, reborn for modern ARM64 hardware. Bare-metal performance with classic OS/2 elegance. No Linux. No systemd. Pure OS/2 architecture from the ground up.
OS/2 Warp 4.52 brings proven stability and elegant design to ARM64. Built for developers, servers, and enthusiasts who demand control.
Direct hardware access without virtualization overhead. Pure ARM64 AArch64 execution with UEFI boot and native device drivers.
EXT4, FAT32, FAT16, and exFAT support out of the box. Advanced VFS layer with mount management and full read/write capability.
Global keyboard support with dead key composition. Latin, Cyrillic, Arabic, Hebrew, Thai, Georgian, Korean, Japanese, and more.
Classic OS/2 service management with CRITICAL, AUTO, and MANUAL modes. Simple, deterministic boot sequence—no systemd complexity.
Authentic OS/2 command processor with REXX scripting support. Familiar commands: DIR, TYPE, COPY, SRVSTAT, MOUNT.
Full C11 kernel source. CMake build system. Cross-compilation with aarch64-elf toolchain. GCC and Clang/LLVM support.
A complete operating system stack: bootloader, kernel, drivers, filesystem, and shell.
BOOTAA64.EFI with GOP graphics, memory map, and kernel loading. Hand-crafted without gnu-efi dependencies.
C11 kernel with UART serial, memory management, block device abstraction, and VFS dispatcher.
EXT4 extent tree support, FAT32/FAT16 with LFN, exFAT for large files. GPT partition probing.
CONFIG.SYS-based service orchestration. STARTUP.CMD boot scripts. OS/2-style resource management.
For ARM64 hardware or QEMU emulation. Full bare-metal installation guide in documentation.
Build a 6 GiB GPT disk with 4 partitions (EFI, OS2ROOT, FAT16DATA, EXFATUSB).
Compile the OS/2 kernel with CMake and the aarch64-elf toolchain.
Launch OS/2 Warp in the ARM64 virtual machine.
Classic OS/2 system configuration for services and devices.
Service management in the OS/2 shell.
Complete documentation for building, deploying, and extending OS/2 Warp ARM64.
OS/2 Warp ARM64 is open-source and community-driven. Your support funds development, hardware testing, and infrastructure for this historic operating system.