Os8088: A powerful Mac-like OS for the IBM XT, 286, 386

In August 2026, a vintage software project known as os8088 was unveiled, providing a Mac-like operating system for the IBM XT, 286, and 386 systems. This real-mode assembly code was written in NASM and made available on GitHub, allowing enthusiasts to explore its capabilities. os8088 boasted a Macintosh System 1-style desktop, featuring overlapping windows, pull-down menus, a serial mouse, loadable programs, and pre-emptive multitasking - capabilities that were absent in the original 1984 Macintosh.

Unlike typical systems of that era, os8088 did not require DOS or a command line interface. The 512-byte boot sector loaded a 40KB kernel, which determined the display adapter type and switched the machine into graphics mode. The video card's own 8x8 character set served as the foundation for the user interface, including draggable windows, menus, close and minimize boxes, icons for floppy drives, and a bottom dock displaying one tile per running program.

All programs could operate simultaneously, fitting within the limited 256KB of RAM available in Intel 8086 and 8088 processors.

As a hobby project, os8088 was meticulously documented through a series of videos, providing step-by-step instructions from the initial boot into a desktop to loading additional packages. These videos were available on the project's video log. To demonstrate the system, disk images were created and written onto real floppy disks, which were then used to boot three period machines: an IBM 5150 from 1981, a Toshiba T1100 Plus, and a 286. Photographs were taken throughout the process to showcase the system's functionality.

Using the browser demo, users could boot the floppy image in an emulated PC, replicating the exact process of writing the bytes to a disk. The project provided 360KB images for period hardware and 86Box, as well as 1.44MB images for QEMU, ensuring compatibility across different emulated environments. To run os8088, users could follow the provided instructions and explore this unique Mac-like operating system on their own hardware.